diff --git a/i18n-coverage-table.png b/i18n-coverage-table.png
index 7b00d33d6..1d5306247 100644
Binary files a/i18n-coverage-table.png and b/i18n-coverage-table.png differ
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/analytics/PackageVisitor.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/analytics/PackageVisitor.java
index 2116caa6d..64a1f0055 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/analytics/PackageVisitor.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/analytics/PackageVisitor.java
@@ -14,11 +14,11 @@ import javax.xml.parsers.ParserConfigurationException;
 
 import org.hl7.fhir.exceptions.FHIRException;
 import org.hl7.fhir.r5.utils.EOperationOutcome;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.model.JsonArray;
 import org.hl7.fhir.utilities.json.model.JsonObject;
 import org.hl7.fhir.utilities.json.parser.JsonParser;
@@ -233,8 +233,8 @@ public class PackageVisitor {
         JsonObject manifest = JsonParser.parseObjectFromUrl(repo+"/package.manifest.json");
         File co = ManagedFileAccess.file(Utilities.path(cache, pid+"."+manifest.asString("date")+".tgz"));
         if (!co.exists()) {
-          SimpleHTTPClient fetcher = new SimpleHTTPClient();
-          HTTPResult res = fetcher.get(repo+"/package.tgz?nocache=" + System.currentTimeMillis());
+
+          HTTPResult res = ManagedWebAccess.get(repo+"/package.tgz?nocache=" + System.currentTimeMillis());
           res.checkThrowException();
           TextFile.bytesToFile(res.getContent(), co);
         }
@@ -330,8 +330,8 @@ public class PackageVisitor {
   private void processFeed(Set<String> list, String str) throws IOException, ParserConfigurationException, SAXException {
     System.out.println("Feed "+str);
     try {
-      SimpleHTTPClient fetcher = new SimpleHTTPClient();
-      HTTPResult res = fetcher.get(str+"?nocache=" + System.currentTimeMillis());
+
+      HTTPResult res = ManagedWebAccess.get(str+"?nocache=" + System.currentTimeMillis());
       res.checkThrowException();
       Document xml = XMLUtil.parseToDom(res.getContent());
       for (Element channel : XMLUtil.getNamedChildren(xml.getDocumentElement(), "channel")) {
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/CKMImporter.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/CKMImporter.java
index 03b39aab9..881bad4a9 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/CKMImporter.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/CKMImporter.java
@@ -40,11 +40,11 @@ import javax.xml.parsers.DocumentBuilderFactory;
 
 
 import org.hl7.fhir.convertors.misc.adl.ADLImporter;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.xml.XMLUtil;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
@@ -125,8 +125,8 @@ public class CKMImporter {
   }
 
   private Document loadXml(String address) throws Exception {
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    HTTPResult res = http.get(address, "application/xml");
+
+    HTTPResult res = ManagedWebAccess.get(address, "application/xml");
     res.checkThrowException();
     InputStream xml = new ByteArrayInputStream(res.getContent());
 
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/ICD11Generator.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/ICD11Generator.java
index e2e402bce..2999ec012 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/ICD11Generator.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/misc/ICD11Generator.java
@@ -25,10 +25,10 @@ import org.hl7.fhir.r4.model.ValueSet.ConceptSetComponent;
 import org.hl7.fhir.r4.model.ValueSet.FilterOperator;
 import org.hl7.fhir.r4.terminologies.CodeSystemUtilities;
 import org.hl7.fhir.r4.utils.ToolingExtensions;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.model.JsonElement;
 import org.hl7.fhir.utilities.json.model.JsonObject;
 import org.hl7.fhir.utilities.json.parser.JsonParser;
@@ -395,10 +395,7 @@ public class ICD11Generator {
 
 
   private JsonObject fetchJson(String source) throws IOException {
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    http.addHeader("API-Version", "v2");
-    http.addHeader("Accept-Language", "en");
-    HTTPResult res = http.get(source, "application/json");
+    HTTPResult res = ManagedWebAccess.builder().withAccept("application/json").withHeader("API-Version", "v2").withHeader("Accept-Language", "en").get(source);
     res.checkThrowException();
     return JsonParser.parseObject(res.getContent());
   }
diff --git a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/conformance/ProfileComparer.java b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/conformance/ProfileComparer.java
index df0179d52..f9d34478d 100644
--- a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/conformance/ProfileComparer.java
+++ b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/conformance/ProfileComparer.java
@@ -66,11 +66,11 @@ import org.hl7.fhir.r4.terminologies.ValueSetExpander.ValueSetExpansionOutcome;
 import org.hl7.fhir.r4.utils.DefinitionNavigator;
 import org.hl7.fhir.r4.utils.ToolingExtensions;
 import org.hl7.fhir.utilities.CommaSeparatedStringBuilder;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.validation.ValidationMessage;
 import org.hl7.fhir.utilities.validation.ValidationMessage.Source;
 
@@ -1383,8 +1383,8 @@ public class ProfileComparer {
     File f = ManagedFileAccess.file(local);
     if (f.exists())
       return TextFile.fileToString(f);
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    HTTPResult res = http.get(source);
+
+    HTTPResult res = ManagedWebAccess.get(source);
     res.checkThrowException();
     String result = TextFile.bytesToString(res.getContent());
     TextFile.stringToFile(result, f);
diff --git a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java
index b481fe422..68b94ed83 100644
--- a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java
+++ b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java
@@ -22,13 +22,13 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.IniFile;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 
 public class TerminologyCacheManager {
 
@@ -87,8 +87,7 @@ public class TerminologyCacheManager {
     try {
       System.out.println("Initialise terminology cache from " + source);
 
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult res = http.get(source + "?nocache=" + System.currentTimeMillis());
+      HTTPResult res = ManagedWebAccess.get(source + "?nocache=" + System.currentTimeMillis());
       res.checkThrowException();
       unzip(new ByteArrayInputStream(res.getContent()), cacheFolder);
     } catch (Exception e) {
@@ -156,11 +155,10 @@ public class TerminologyCacheManager {
     // post it to
     String url = "https://tx.fhir.org/post/tx-cache/" + ghOrg + "/" + ghRepo + "/" + ghBranch + ".zip";
     System.out.println("Sending tx-cache to " + url + " (" + Utilities.describeSize(bs.toByteArray().length) + ")");
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    http.setAuthenticationMode(SimpleHTTPClient.AuthenticationMode.BASIC);
-    http.setUsername(token.substring(0, token.indexOf(':')));
-    http.setPassword(token.substring(token.indexOf(':') + 1));
-    HTTPResult res = http.put(url, "application/zip", bs.toByteArray(), null); // accept doesn't matter
+
+    HTTPResult res = ManagedWebAccess.builder()
+     .withBasicAuth(token.substring(0, token.indexOf(':')), token.substring(token.indexOf(':') + 1))
+     .withAccept("application/zip").put(url, bs.toByteArray(), null);
     if (res.getCode() >= 300) {
       System.out.println("sending cache failed: " + res.getCode());
     } else {
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHLParser.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHLParser.java
index e47867691..bbbf0e851 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHLParser.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHLParser.java
@@ -29,11 +29,11 @@ import org.hl7.fhir.r5.context.IWorkerContext;
 import org.hl7.fhir.r5.formats.IParser.OutputStyle;
 import org.hl7.fhir.r5.test.utils.TestingUtilities;
 import org.hl7.fhir.utilities.CommaSeparatedStringBuilder;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.model.JsonArray;
 import org.hl7.fhir.utilities.json.model.JsonElement;
 import org.hl7.fhir.utilities.json.model.JsonElementType;
@@ -287,9 +287,7 @@ public class SHLParser extends ParserBase {
 
 
   private HTTPResult fetchFile(String url, String ct) throws IOException {
-    SimpleHTTPClient fetcher = new SimpleHTTPClient();
-    fetcher.addHeader("Accept", ct);
-    HTTPResult res = fetcher.get(url);
+    HTTPResult res = ManagedWebAccess.get(url, ct);
     res.checkThrowException();
     return res;
   }
@@ -298,10 +296,10 @@ public class SHLParser extends ParserBase {
     if (testMode) {
       return new HTTPResult(url, 200, "OK", "application/json", TextFile.streamToBytes(TestingUtilities.loadTestResourceStream("validator", "shlink.manifest.json")));
     }
-    SimpleHTTPClient fetcher = new SimpleHTTPClient();
+
     JsonObject j = new JsonObject();
     j.add("recipient", "FHIR Validator");
-    HTTPResult res = fetcher.post(url, "application/json", org.hl7.fhir.utilities.json.parser.JsonParser.composeBytes(j), "application/json");        
+    HTTPResult res = ManagedWebAccess.post(url, org.hl7.fhir.utilities.json.parser.JsonParser.composeBytes(j), "application/json", "application/json");        
     res.checkThrowException();
     return res;
   }
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java
index 31cfd4900..bdddf9b10 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java
@@ -294,7 +294,7 @@ public class DataRenderer extends Renderer implements CodeResolver {
     if (system.equals("http://loinc.org"))
     	return (context.formatMessage(RenderingContext.DATA_REND_LOINC));
     if (system.startsWith("http://snomed.info"))
-    	 return (context.formatMessage(RenderingContext.DATA_REND_SNOWMED));
+    	 return (context.formatMessage(RenderingContext.DATA_REND_SNOMED));
     if (system.equals("http://www.nlm.nih.gov/research/umls/rxnorm"))
     	return (context.formatMessage(RenderingContext.DATA_REND_RXNORM));
     if (system.equals("http://hl7.org/fhir/sid/icd-9"))
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/TerminologyCacheManager.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/TerminologyCacheManager.java
index fc3ea158b..3e63ac0a8 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/TerminologyCacheManager.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/TerminologyCacheManager.java
@@ -22,13 +22,13 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.IniFile;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 
 public class TerminologyCacheManager {
 
@@ -86,8 +86,7 @@ public class TerminologyCacheManager {
     try {
       System.out.println("Initialise terminology cache from "+source);
 
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult res = http.get(source+"?nocache=" + System.currentTimeMillis());
+      HTTPResult res = ManagedWebAccess.get(source+"?nocache=" + System.currentTimeMillis());
       res.checkThrowException();
       unzip(new ByteArrayInputStream(res.getContent()), cacheFolder);
     } catch (Exception e) {
@@ -157,11 +156,10 @@ public class TerminologyCacheManager {
     // post it to
     String url = "https://tx.fhir.org/post/tx-cache/"+ghOrg+"/"+ghRepo+"/"+ghBranch+".zip";
     System.out.println("Sending tx-cache to "+url+" ("+Utilities.describeSize(bs.toByteArray().length)+")");
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    http.setAuthenticationMode(SimpleHTTPClient.AuthenticationMode.BASIC);
-    http.setUsername(token.substring(0, token.indexOf(':')));
-    http.setPassword(token.substring(token.indexOf(':')+1));
-    HTTPResult res = http.put(url, "application/zip", bs.toByteArray(), null); // accept doesn't matter
+    HTTPResult res = ManagedWebAccess.builder()
+        .withBasicAuth(token.substring(0, token.indexOf(':')), token.substring(token.indexOf(':') + 1))
+        .withAccept("application/zip").put(url, bs.toByteArray(), null);
+    
     if (res.getCode() >= 300) {
       System.out.println("sending cache failed: "+res.getCode());
     } else {
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPAuthenticationMode.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPAuthenticationMode.java
new file mode 100644
index 000000000..401c1cd15
--- /dev/null
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPAuthenticationMode.java
@@ -0,0 +1,7 @@
+package org.hl7.fhir.utilities.http;
+
+public enum HTTPAuthenticationMode {
+  NONE,
+  BASIC,
+  TOKEN
+}
\ No newline at end of file
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPResult.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPResult.java
new file mode 100644
index 000000000..0a3986ec1
--- /dev/null
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPResult.java
@@ -0,0 +1,62 @@
+package org.hl7.fhir.utilities.http;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import org.hl7.fhir.utilities.TextFile;
+import org.hl7.fhir.utilities.Utilities;
+
+public class HTTPResult {
+  private int code;
+  private String contentType;
+  private byte[] content;
+  private String source;
+  private String message;
+  
+  
+  public HTTPResult(String source, int code, String message, String contentType, byte[] content) {
+    super();
+    this.source = source;
+    this.code = code;
+    this.contentType = contentType;
+    this.content = content;
+    this.message = message;
+  }
+  
+  public int getCode() {
+    return code;
+  }
+  public String getContentType() {
+    return contentType;
+  }
+  public byte[] getContent() {
+    return content;
+  }
+
+  public String getSource() {
+    return source;
+  }
+
+  public void checkThrowException() throws IOException {
+    if (code >= 300) {
+      String filename = Utilities.path("[tmp]", "http-log", "fhir-http-"+(SimpleHTTPClient.nextCounter())+".log");
+      if (content == null || content.length == 0) {
+        HTTPResultException exception = new HTTPResultException(code, message, source, null);
+        throw new IOException(exception.message, exception);
+      } else {
+        Utilities.createDirectory(Utilities.path("[tmp]", "http-log"));
+        TextFile.bytesToFile(content, filename);
+        HTTPResultException exception = new HTTPResultException(code, message, source, filename);
+        throw new IOException(exception.message, exception);
+      }
+    }      
+  }
+
+  public String getMessage() {
+    return message;
+  }
+
+  public String getContentAsString() {
+    return new String(content, StandardCharsets.UTF_8);
+  }    
+}
\ No newline at end of file
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPResultException.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPResultException.java
new file mode 100644
index 000000000..dce4d00e5
--- /dev/null
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/HTTPResultException.java
@@ -0,0 +1,24 @@
+package org.hl7.fhir.utilities.http;
+
+public class HTTPResultException extends Exception{
+  public final int httpCode;
+
+  public final String message;
+
+  public final String url;
+  public final String logPath;
+
+  public HTTPResultException(int httpCode, String message, String url, String logPath) {
+    this.httpCode = httpCode;
+    this.message = message;
+    this.url = url;
+    this.logPath = logPath;
+  }
+
+  public String getMessage() {
+    return "Invalid HTTP response "+httpCode+" from "+url+" ("+message+") (" + (
+      logPath != null ? "Response in " + logPath : "No response content")
+    + ")";
+  }
+
+}
\ No newline at end of file
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccess.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccess.java
new file mode 100644
index 000000000..6c90c3a44
--- /dev/null
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccess.java
@@ -0,0 +1,131 @@
+package org.hl7.fhir.utilities.http;
+
+/*
+  Copyright (c) 2011+, HL7, Inc.
+  All rights reserved.
+  
+  Redistribution and use in source and binary forms, with or without modification, 
+  are permitted provided that the following conditions are met:
+    
+   * Redistributions of source code must retain the above copyright notice, this 
+     list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above copyright notice, 
+     this list of conditions and the following disclaimer in the documentation 
+     and/or other materials provided with the distribution.
+   * Neither the name of HL7 nor the names of its contributors may be used to 
+     endorse or promote products derived from this software without specific 
+     prior written permission.
+  
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+  POSSIBILITY OF SUCH DAMAGE.
+  
+ */
+
+
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.hl7.fhir.utilities.Utilities;
+
+/**
+ * see security.md - manages access to the local file system by the FHIR HAPI Core library
+ * 
+ * By using accessPolicy, allowedDomains and accessor, a host java application can control 
+ * whether this library has direct access to the web (and which domains it is allowed to access),
+ * or whether the host application provides controlled access, or whether no access is allowed at all
+ * (in which case other information providers need to be provided)
+ *  
+ * @author Grahame
+ *
+ */
+public class ManagedWebAccess {
+  
+  public interface IWebAccessor {
+    HTTPResult get(String url, String accept, Map<String, String> headers) throws IOException;
+    HTTPResult post(String url, byte[] bytes, String contentType, String accept, Map<String, String> headers) throws IOException;
+    HTTPResult put(String url, byte[] bytes, String contentType, String accept, Map<String, String> headers) throws IOException;
+  }
+
+  public enum WebAccessPolicy {
+    DIRECT, // open access to the local file system, though access can be restricted only to files under the paths in AllowedPaths
+    MANAGED, // no access except by the FileSystemProxyProvider
+    PROHIBITED, // no access at all to File() services
+  }
+
+  private static WebAccessPolicy accessPolicy = WebAccessPolicy.DIRECT; // for legacy reasons
+  private static List<String> allowedDomains = new ArrayList<>();
+  private static IWebAccessor accessor;
+  private static String userAgent;
+  
+  
+  public static WebAccessPolicy getAccessPolicy() {
+    return accessPolicy;
+  }
+
+  public static void setAccessPolicy(WebAccessPolicy accessPolicy) {
+    ManagedWebAccess.accessPolicy = accessPolicy;
+  }
+
+  static boolean inAllowedPaths(String pathname) {
+    if (allowedDomains.isEmpty()) {
+      return true;
+    }
+    for (String s : allowedDomains) {
+      if (pathname.startsWith(s)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  public static String getUserAgent() {
+    return userAgent;
+  }
+
+  public static void setUserAgent(String userAgent) {
+    ManagedWebAccess.userAgent = userAgent;
+  }
+
+  public static IWebAccessor getAccessor() {
+    return accessor;
+  }
+
+  public static ManagedWebAccessBuilder builder() {
+    return new ManagedWebAccessBuilder(userAgent);
+  }
+
+  public static HTTPResult get(String url) throws IOException {
+    return builder().get(url);
+  }
+
+  public static HTTPResult get(String url, String accept) throws IOException {
+    return builder().withAccept(accept).get(url);
+  }
+
+  public static HTTPResult post(String url, byte[] content, String contentType, String accept) throws IOException {
+    return builder().withAccept(accept).post(url, content, contentType);
+  }
+  
+
+  public static HTTPResult put(String url, byte[] content, String contentType, String accept) throws IOException {
+    return builder().withAccept(accept).put(url, content, contentType);
+  }
+
+}
\ No newline at end of file
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccessBuilder.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccessBuilder.java
new file mode 100644
index 000000000..5eac395c6
--- /dev/null
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccessBuilder.java
@@ -0,0 +1,126 @@
+package org.hl7.fhir.utilities.http;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Map;
+
+
+public class ManagedWebAccessBuilder {
+
+  private String userAgent;
+  private HTTPAuthenticationMode authenticationMode;
+  private String username;
+  private String password;
+  private String token;
+  private String accept;
+  private Map<String, String> headers = new HashMap<String, String>();
+
+  public ManagedWebAccessBuilder(String userAgent) {
+    this.userAgent = userAgent;
+  }
+
+  public ManagedWebAccessBuilder withAccept(String accept) {
+    this.accept = accept;
+    return this;
+  }
+
+  public ManagedWebAccessBuilder withHeader(String name, String value) {
+    headers.put(name, value);
+    return this;
+  }
+
+  public ManagedWebAccessBuilder withBasicAuth(String username, String password) {
+    this.authenticationMode = HTTPAuthenticationMode.BASIC;
+    this.username = username;
+    this.password = password;
+    return this;
+  }
+  
+  public ManagedWebAccessBuilder withToken(String token) {
+    this.authenticationMode = HTTPAuthenticationMode.TOKEN;
+    this.token = token;
+    return this;
+  }
+  
+  private Map<String, String> headers() {
+    Map<String, String> headers = new HashMap<String, String>();
+    headers.putAll(this.headers);
+    if (authenticationMode == HTTPAuthenticationMode.TOKEN) {
+      headers.put("Authorization", "Bearer " + token);
+    } else if (authenticationMode == HTTPAuthenticationMode.BASIC) {
+      String auth = username+":"+password;
+      byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8));
+      headers.put("Authorization", "Basic " + new String(encodedAuth));
+    }
+
+    if (userAgent != null) {
+      headers.put("User-Agent", userAgent);
+    }
+
+    return headers;
+  }
+
+  private SimpleHTTPClient setupClient(String url) throws IOException {
+    if (!ManagedWebAccess.inAllowedPaths(url)) {
+      throw new IOException("The pathname '"+url+"' cannot be accessed by policy");
+    }
+    SimpleHTTPClient client = new SimpleHTTPClient();
+    if (userAgent != null) {
+      client.addHeader("User-Agent", userAgent);
+    }
+    if (username != null || token != null) {
+      client.setUsername(username);
+      client.setPassword(password);
+      client.setToken(token);
+      client.setAuthenticationMode(authenticationMode);
+    }
+    return client;
+  }
+
+
+  public HTTPResult get(String url) throws IOException {
+    switch (ManagedWebAccess.getAccessPolicy()) {
+    case DIRECT:
+      SimpleHTTPClient client = setupClient(url);
+      return client.get(url, accept);
+    case MANAGED:
+      return ManagedWebAccess.getAccessor().get(url, accept, headers());
+    case PROHIBITED:
+      throw new IOException("Access to the internet is not allowed by local security policy");
+    default:
+      throw new IOException("Internal Error");
+    }
+  }
+
+
+  public HTTPResult post(String url, byte[] content, String contentType) throws IOException {
+    switch (ManagedWebAccess.getAccessPolicy()) {
+    case DIRECT:
+      SimpleHTTPClient client = setupClient(url);
+      return client.post(url, contentType, content, accept);
+    case MANAGED:
+      return ManagedWebAccess.getAccessor().post(url, content, contentType, accept, headers());
+    case PROHIBITED:
+      throw new IOException("Access to the internet is not allowed by local security policy");
+    default:
+      throw new IOException("Internal Error");
+    }
+  }
+
+  public HTTPResult put(String url, byte[] content, String contentType) throws IOException {
+    switch (ManagedWebAccess.getAccessPolicy()) {
+    case DIRECT:
+      SimpleHTTPClient client = setupClient(url);
+      return client.put(url, contentType, content, accept);
+    case MANAGED:
+      return ManagedWebAccess.getAccessor().put(url, content, contentType, accept, headers());
+    case PROHIBITED:
+      throw new IOException("Access to the internet is not allowed by local security policy");
+    default:
+      throw new IOException("Internal Error");
+    }
+  }
+
+}
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/SimpleHTTPClient.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/SimpleHTTPClient.java
similarity index 66%
rename from org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/SimpleHTTPClient.java
rename to org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/SimpleHTTPClient.java
index 56461c690..ad3f5c7d5 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/SimpleHTTPClient.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/SimpleHTTPClient.java
@@ -1,4 +1,4 @@
-package org.hl7.fhir.utilities;
+package org.hl7.fhir.utilities.http;
 
 import java.io.IOException;
 import java.net.HttpURLConnection;
@@ -12,6 +12,7 @@ import java.util.List;
 import java.util.Map;
 
 import org.hl7.fhir.exceptions.FHIRException;
+import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.settings.FhirSettings;
 
 import lombok.Getter;
@@ -19,11 +20,6 @@ import lombok.Setter;
 
 public class SimpleHTTPClient {
 
-  public enum AuthenticationMode {
-    NONE,
-    BASIC,
-    TOKEN
-  }
 
 	public static class Header {
     private String name;
@@ -44,88 +40,10 @@ public class SimpleHTTPClient {
   private static final int MAX_REDIRECTS = 5;
   private static int counter = 1;
 
-  public static class HTTPResultException extends Exception{
-    public final int httpCode;
-
-    public final String message;
-
-    public final String url;
-    public final String logPath;
-
-    public HTTPResultException(int httpCode, String message, String url, String logPath) {
-      this.httpCode = httpCode;
-      this.message = message;
-      this.url = url;
-      this.logPath = logPath;
-    }
-
-    public String getMessage() {
-      return "Invalid HTTP response "+httpCode+" from "+url+" ("+message+") (" + (
-        logPath != null ? "Response in " + logPath : "No response content")
-      + ")";
-    }
-
-  }
-
-  public static class HTTPResult {
-    private int code;
-    private String contentType;
-    private byte[] content;
-    private String source;
-    private String message;
-    
-    
-    public HTTPResult(String source, int code, String message, String contentType, byte[] content) {
-      super();
-      this.source = source;
-      this.code = code;
-      this.contentType = contentType;
-      this.content = content;
-      this.message = message;
-    }
-    
-    public int getCode() {
-      return code;
-    }
-    public String getContentType() {
-      return contentType;
-    }
-    public byte[] getContent() {
-      return content;
-    }
-
-    public String getSource() {
-      return source;
-    }
-
-    public void checkThrowException() throws IOException {
-      if (code >= 300) {
-        String filename = Utilities.path("[tmp]", "http-log", "fhir-http-"+(++counter)+".log");
-        if (content == null || content.length == 0) {
-          HTTPResultException exception = new HTTPResultException(code, message, source, null);
-          throw new IOException(exception.message, exception);
-        } else {
-          Utilities.createDirectory(Utilities.path("[tmp]", "http-log"));
-          TextFile.bytesToFile(content, filename);
-          HTTPResultException exception = new HTTPResultException(code, message, source, filename);
-          throw new IOException(exception.message, exception);
-        }
-      }      
-    }
-
-    public String getMessage() {
-      return message;
-    }
-
-    public String getContentAsString() {
-      return new String(content, StandardCharsets.UTF_8);
-    }    
-  }
-
   private List<Header> headers = new ArrayList<>();
 
   @Getter @Setter
-  private AuthenticationMode authenticationMode;
+  private HTTPAuthenticationMode authenticationMode;
 
   @Getter @Setter
   private String username;
@@ -202,9 +120,9 @@ public class SimpleHTTPClient {
 
   private void setAuthenticationHeader(HttpURLConnection c) {
     String authHeaderValue = null;
-    if (authenticationMode == AuthenticationMode.TOKEN) {
+    if (authenticationMode == HTTPAuthenticationMode.TOKEN) {
       authHeaderValue = "Bearer " + new String(token);
-    } else if (authenticationMode == AuthenticationMode.BASIC) {
+    } else if (authenticationMode == HTTPAuthenticationMode.BASIC) {
       String auth = username+":"+password;
       byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8));
       authHeaderValue = "Basic " + new String(encodedAuth);
@@ -254,5 +172,9 @@ public class SimpleHTTPClient {
     return new HTTPResult(url, c.getResponseCode(), c.getResponseMessage(), c.getRequestProperty("Content-Type"), TextFile.streamToBytes(c.getResponseCode() >= 400 ? c.getErrorStream() : c.getInputStream()));
   }
 
+  public static int nextCounter() {
+    return ++counter;
+  }
+
 
 }
\ No newline at end of file
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/RenderingI18nContext.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/RenderingI18nContext.java
index 01a2d927e..7216385b1 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/RenderingI18nContext.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/RenderingI18nContext.java
@@ -223,7 +223,7 @@ public class RenderingI18nContext extends I18nBase {
   public static final String DATA_REND_MKDWN_LNK = "DATA_REND_MKDWN_LNK";
   public static final String DATA_REND_UNRD_EX = "DATA_REND_UNRD_EX";
   public static final String DATA_REND_LOINC = "DATA_REND_LOINC";
-  public static final String DATA_REND_SNOWMED = "DATA_REND_SNOWMED";
+  public static final String DATA_REND_SNOMED = "DATA_REND_SNOMED";
   public static final String DATA_REND_RXNORM = "DATA_REND_RXNORM";
   public static final String DATA_REND_ICD = "DATA_REND_ICD";
   public static final String DATA_REND_DICOM = "DATA_REND_DICOM";
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java
index 325c02617..893aba96c 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java
@@ -40,10 +40,10 @@ import java.nio.charset.StandardCharsets;
 import java.util.Map;
 import java.util.Stack;
 
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
@@ -724,15 +724,13 @@ public class JsonTrackingParser {
   }
   
   public static JsonObject fetchJson(String source) throws IOException {
-    SimpleHTTPClient fetcher = new SimpleHTTPClient();
-    HTTPResult res = fetcher.get(source+"?nocache=" + System.currentTimeMillis());
+    HTTPResult res = ManagedWebAccess.get(source+"?nocache=" + System.currentTimeMillis(), "application/json, application/fhir+json");
     res.checkThrowException();
     return parseJson(res.getContent());
   }
   
   public static JsonArray fetchJsonArray(String source) throws IOException {
-    SimpleHTTPClient fetcher = new SimpleHTTPClient();
-    HTTPResult res = fetcher.get(source+"?nocache=" + System.currentTimeMillis());
+    HTTPResult res = ManagedWebAccess.get(source+"?nocache=" + System.currentTimeMillis(), "application/json, application/fhir+json");
     res.checkThrowException();
     return parseJsonArray(res.getContent());
   }
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/parser/JsonParser.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/parser/JsonParser.java
index 3bf7e9f37..f795b6bdf 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/parser/JsonParser.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/parser/JsonParser.java
@@ -8,11 +8,11 @@ import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
 
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.JsonException;
 import org.hl7.fhir.utilities.json.model.JsonArray;
 import org.hl7.fhir.utilities.json.model.JsonBoolean;
@@ -671,10 +671,8 @@ public class JsonParser {
   }
 
   private static byte[] fetch(String source) throws IOException {
-    SimpleHTTPClient fetcher = new SimpleHTTPClient();
-    fetcher.addHeader("Accept", "application/json, application/fhir+json");
     String murl = source.contains("?") ? source+"&nocache=" + System.currentTimeMillis() : source+"?nocache=" + System.currentTimeMillis();
-    HTTPResult res = fetcher.get(murl);
+    HTTPResult res = ManagedWebAccess.get(murl, "application/json, application/fhir+json");
     res.checkThrowException();
     return res.getContent();
   }
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/FilesystemPackageCacheManager.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/FilesystemPackageCacheManager.java
index b326fcc40..c3ad924f2 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/FilesystemPackageCacheManager.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/FilesystemPackageCacheManager.java
@@ -27,12 +27,12 @@ import lombok.With;
 import org.apache.commons.io.FileUtils;
 import org.hl7.fhir.exceptions.FHIRException;
 import org.hl7.fhir.utilities.IniFile;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.model.JsonArray;
 import org.hl7.fhir.utilities.json.model.JsonElement;
 import org.hl7.fhir.utilities.json.model.JsonObject;
@@ -658,8 +658,7 @@ public class FilesystemPackageCacheManager extends BasePackageCacheManager imple
 
   private InputStream fetchFromUrlSpecific(String source, boolean optional) throws FHIRException {
     try {
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult res = http.get(source);
+      HTTPResult res = ManagedWebAccess.get(source);
       res.checkThrowException();
       return new ByteArrayInputStream(res.getContent());
     } catch (Exception e) {
@@ -803,9 +802,8 @@ public class FilesystemPackageCacheManager extends BasePackageCacheManager imple
   }
 
   private void loadFromBuildServer() throws IOException {
-    SimpleHTTPClient http = new SimpleHTTPClient();
 
-    HTTPResult res = http.get("https://build.fhir.org/ig/qas.json?nocache=" + System.currentTimeMillis());
+    HTTPResult res = ManagedWebAccess.get("https://build.fhir.org/ig/qas.json?nocache=" + System.currentTimeMillis());
     res.checkThrowException();
 
     buildInfo = (JsonArray) JsonParser.parse(TextFile.bytesToString(res.getContent()));
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java
index ee64726f5..387240cdd 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java
@@ -68,11 +68,11 @@ import org.apache.commons.compress.compressors.gzip.GzipParameters;
 import org.hl7.fhir.exceptions.FHIRException;
 import org.hl7.fhir.utilities.ByteProvider;
 import org.hl7.fhir.utilities.CommaSeparatedStringBuilder;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.JsonException;
 import org.hl7.fhir.utilities.json.model.JsonArray;
 import org.hl7.fhir.utilities.json.model.JsonElement;
@@ -1443,8 +1443,7 @@ public class NpmPackage {
   }
 
   public static NpmPackage fromUrl(String source) throws IOException {
-    SimpleHTTPClient fetcher = new SimpleHTTPClient();
-    HTTPResult res = fetcher.get(source+"?nocache=" + System.currentTimeMillis());
+    HTTPResult res = ManagedWebAccess.get(source+"?nocache=" + System.currentTimeMillis());
     res.checkThrowException();
     return fromPackage(new ByteArrayInputStream(res.getContent()));
   }
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageClient.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageClient.java
index 0728243bc..1dbab8248 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageClient.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageClient.java
@@ -18,11 +18,13 @@ import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 import org.hl7.fhir.utilities.CommaSeparatedStringBuilder;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
+import org.hl7.fhir.utilities.http.HTTPAuthenticationMode;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
+import org.hl7.fhir.utilities.http.ManagedWebAccessBuilder;
 import org.hl7.fhir.utilities.json.model.JsonArray;
 import org.hl7.fhir.utilities.json.model.JsonObject;
 import org.hl7.fhir.utilities.json.model.JsonProperty;
@@ -174,22 +176,17 @@ public class PackageClient {
   }
  
   private InputStream fetchUrl(String source, String accept) throws IOException {
-    SimpleHTTPClient http = getSimpleHTTPClient();
-    HTTPResult res = http.get(source, accept);
+    ManagedWebAccessBuilder client = ManagedWebAccess.builder().withAccept(accept);
+    if (server.getAuthenticationMode() == HTTPAuthenticationMode.TOKEN) {
+      client.withToken(server.getToken());
+    } else if (server.getAuthenticationMode() == HTTPAuthenticationMode.BASIC) {
+      client.withBasicAuth(server.getUsername(), server.getPassword());
+    }
+    HTTPResult res = client.get(source);
     res.checkThrowException();
     return new ByteArrayInputStream(res.getContent());
   }
 
-  @Nonnull
-  private SimpleHTTPClient getSimpleHTTPClient() {
-    SimpleHTTPClient client = new SimpleHTTPClient();
-    client.setAuthenticationMode(server.getAuthenticationMode());
-    client.setUsername(server.getUsername());
-    client.setPassword(server.getPassword());
-    client.setToken(server.getToken());
-    return client;
-  }
-
   private JsonObject fetchJson(String source) throws IOException {
     String src = TextFile.streamToString(fetchUrl(source, "application/json"));
     //System.out.println(src);
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageServer.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageServer.java
index 22b1143c4..3a343eed1 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageServer.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageServer.java
@@ -6,7 +6,8 @@ import java.util.stream.Collectors;
 
 import javax.annotation.Nullable;
 
-import org.hl7.fhir.utilities.SimpleHTTPClient;
+import org.hl7.fhir.utilities.http.HTTPAuthenticationMode;
+import org.hl7.fhir.utilities.http.SimpleHTTPClient;
 import org.hl7.fhir.utilities.settings.FhirSettings;
 import org.hl7.fhir.utilities.settings.PackageServerPOJO;
 
@@ -22,14 +23,14 @@ public class PackageServer {
 
   public PackageServer(String url) {
     this.url = url;
-    authenticationMode = SimpleHTTPClient.AuthenticationMode.NONE;
+    authenticationMode = HTTPAuthenticationMode.NONE;
     serverType = PackageServerType.FHIR;
   }
 
   private String url;
 
   @Getter
-  private  SimpleHTTPClient.AuthenticationMode authenticationMode;
+  private  HTTPAuthenticationMode authenticationMode;
 
   @Getter
   private PackageServerType serverType;
@@ -76,9 +77,9 @@ public class PackageServer {
   }
 
   @Nullable
-  private static SimpleHTTPClient.AuthenticationMode getModeFromPOJO(PackageServerPOJO pojo) {
-    if (pojo.getAuthenticationType().equalsIgnoreCase("basic")) return  SimpleHTTPClient.AuthenticationMode.BASIC;
-    if (pojo.getAuthenticationType().equalsIgnoreCase("token")) return  SimpleHTTPClient.AuthenticationMode.TOKEN;
+  private static HTTPAuthenticationMode getModeFromPOJO(PackageServerPOJO pojo) {
+    if (pojo.getAuthenticationType().equalsIgnoreCase("basic")) return HTTPAuthenticationMode.BASIC;
+    if (pojo.getAuthenticationType().equalsIgnoreCase("token")) return HTTPAuthenticationMode.TOKEN;
     return null;
   }
 
@@ -103,7 +104,7 @@ public class PackageServer {
     return packageServer;
   }
 
-  public PackageServer withAuthenticationMode( SimpleHTTPClient.AuthenticationMode mode) {
+  public PackageServer withAuthenticationMode(HTTPAuthenticationMode mode) {
     PackageServer packageServer = this.copy();
     packageServer.authenticationMode = mode;
     return packageServer;
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/settings/FhirSettings.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/settings/FhirSettings.java
index 0509041f1..ac1bc04f4 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/settings/FhirSettings.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/settings/FhirSettings.java
@@ -135,6 +135,12 @@ public class FhirSettings {
       : instance.fhirSettings.getProhibitNetworkAccess(); 
   }
   
+  /**
+   * See ManagedWebAccess and use that to control network access
+   * 
+   * @param value
+   */
+  @Deprecated
   public static void setProhibitNetworkAccess(boolean value) {
     prohibitNetworkAccess = value;
   }
diff --git a/org.hl7.fhir.utilities/src/main/resources/rendering-phrases.properties b/org.hl7.fhir.utilities/src/main/resources/rendering-phrases.properties
index 8c2808158..8296f40d2 100644
--- a/org.hl7.fhir.utilities/src/main/resources/rendering-phrases.properties
+++ b/org.hl7.fhir.utilities/src/main/resources/rendering-phrases.properties
@@ -230,7 +230,7 @@ CONC_MAP_PROP = Properties
 DATA_REND_MKDWN_LNK = Unable to resolve markdown link
 DATA_REND_UNRD_EX = WARNING: Unrenderable Modifier Extension!
 DATA_REND_LOINC = LOINC
-DATA_REND_SNOWMED = SNOWMED CT
+DATA_REND_SNOMED = SNOMED CT
 DATA_REND_RXNORM = RxNorm
 DATA_REND_ICD = ICD-9
 DATA_REND_DICOM = DICOM
diff --git a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/SimpleHTTPClientTest.java b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/SimpleHTTPClientTest.java
index d2fe2e6c9..866894056 100644
--- a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/SimpleHTTPClientTest.java
+++ b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/SimpleHTTPClientTest.java
@@ -4,6 +4,8 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.IOException;
 
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.SimpleHTTPClient;
 import org.junit.jupiter.api.Test;
 
 public class SimpleHTTPClientTest {
@@ -13,7 +15,7 @@ public class SimpleHTTPClientTest {
     SimpleHTTPClient http = new SimpleHTTPClient();
     String url = "https://hl7.org/fhir/us/core/package-list.json?nocache=" + System.currentTimeMillis();
 
-    SimpleHTTPClient.HTTPResult res = http.get(url, "application/json");
+    HTTPResult res = http.get(url, "application/json");
 
 //    System.out.println(res.getCode());
 //    System.out.println(new String(res.getContent(), StandardCharsets.UTF_8));
diff --git a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/BasePackageCacheManagerTests.java b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/BasePackageCacheManagerTests.java
index f8db6c792..dfb3589ed 100644
--- a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/BasePackageCacheManagerTests.java
+++ b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/BasePackageCacheManagerTests.java
@@ -9,7 +9,7 @@ import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 import org.hl7.fhir.exceptions.FHIRException;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
+import org.hl7.fhir.utilities.http.HTTPAuthenticationMode;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -26,7 +26,7 @@ public class BasePackageCacheManagerTests {
     server.enqueueDummyPackage();
 
     PackageServer testServer = new PackageServer(packageServerUrl)
-      .withAuthenticationMode(SimpleHTTPClient.AuthenticationMode.BASIC)
+      .withAuthenticationMode(HTTPAuthenticationMode.BASIC)
       .withServerType(PackageServer.PackageServerType.NPM)
       .withUsername(MockPackageServer.DUMMY_USERNAME)
       .withPassword(MockPackageServer.DUMMY_PASSWORD);
@@ -57,11 +57,11 @@ public class BasePackageCacheManagerTests {
     String packageServerBUrl = serverB.getPackageServerUrl();
 
     PackageServer testServerA = new PackageServer(packageServerAUrl)
-      .withAuthenticationMode(SimpleHTTPClient.AuthenticationMode.BASIC)
+      .withAuthenticationMode(HTTPAuthenticationMode.BASIC)
       .withServerType(PackageServer.PackageServerType.NPM);
 
     PackageServer testServerB = new PackageServer(packageServerBUrl)
-      .withAuthenticationMode(SimpleHTTPClient.AuthenticationMode.BASIC)
+      .withAuthenticationMode(HTTPAuthenticationMode.BASIC)
       .withServerType(PackageServer.PackageServerType.NPM);
 
     basePackageCacheManager.addPackageServer(testServerA);
diff --git a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/PackageServerTest.java b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/PackageServerTest.java
index 824900fd8..d9694bc9e 100644
--- a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/PackageServerTest.java
+++ b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/PackageServerTest.java
@@ -10,7 +10,7 @@ import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.Base64;
 
-import org.hl7.fhir.utilities.SimpleHTTPClient;
+import org.hl7.fhir.utilities.http.HTTPAuthenticationMode;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -41,7 +41,7 @@ public class PackageServerTest {
     server.enqueueDummyPackage();
 
     PackageServer testServer = new PackageServer(packageServerUrl)
-      .withAuthenticationMode(SimpleHTTPClient.AuthenticationMode.BASIC)
+      .withAuthenticationMode(HTTPAuthenticationMode.BASIC)
       .withServerType(PackageServer.PackageServerType.NPM)
       .withUsername(MockPackageServer.DUMMY_USERNAME)
       .withPassword(MockPackageServer.DUMMY_PASSWORD);
@@ -74,7 +74,7 @@ public class PackageServerTest {
     server.enqueueDummyPackage();
 
     PackageServer testServer = new PackageServer(packageServerUrl)
-      .withAuthenticationMode(SimpleHTTPClient.AuthenticationMode.TOKEN)
+      .withAuthenticationMode(HTTPAuthenticationMode.TOKEN)
       .withServerType(PackageServer.PackageServerType.NPM)
       .withToken(MockPackageServer.DUMMY_TOKEN);
     PackageClient packageClient = new PackageClient(testServer);
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/IgLoader.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/IgLoader.java
index 36fc1e218..aadf0b80f 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/IgLoader.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/IgLoader.java
@@ -32,12 +32,12 @@ import org.hl7.fhir.r5.model.Resource;
 import org.hl7.fhir.r5.utils.structuremap.StructureMapUtilities;
 import org.hl7.fhir.utilities.ByteProvider;
 import org.hl7.fhir.utilities.IniFile;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.npm.FilesystemPackageCacheManager;
 import org.hl7.fhir.utilities.npm.NpmPackage;
 import org.hl7.fhir.utilities.turtle.Turtle;
@@ -416,8 +416,7 @@ public class IgLoader implements IValidationEngineLoader {
 
   private InputStream fetchFromUrlSpecific(String source, boolean optional) throws FHIRException, IOException {
     try {
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult res = http.get(source + "?nocache=" + System.currentTimeMillis());
+      HTTPResult res = ManagedWebAccess.get(source + "?nocache=" + System.currentTimeMillis());
       res.checkThrowException();
       return new ByteArrayInputStream(res.getContent());
     } catch (IOException e) {
@@ -561,14 +560,13 @@ public class IgLoader implements IValidationEngineLoader {
 
   private byte[] fetchFromUrlSpecific(String source, String contentType, boolean optional, List<String> errors) throws FHIRException, IOException {
     try {
-      SimpleHTTPClient http = new SimpleHTTPClient();
       try {
         // try with cache-busting option and then try withhout in case the server doesn't support that
-        HTTPResult res = http.get(source + "?nocache=" + System.currentTimeMillis(), contentType);
+        HTTPResult res = ManagedWebAccess.get(source + "?nocache=" + System.currentTimeMillis(), contentType);
         res.checkThrowException();
         return res.getContent();
       } catch (Exception e) {
-        HTTPResult res = http.get(source, contentType);
+        HTTPResult res = ManagedWebAccess.get(source, contentType);
         res.checkThrowException();
         return res.getContent();
       }
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/Scanner.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/Scanner.java
index eec3e31bc..5dd66f704 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/Scanner.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/Scanner.java
@@ -31,11 +31,11 @@ import org.hl7.fhir.r5.renderers.RendererFactory;
 import org.hl7.fhir.r5.renderers.utils.RenderingContext;
 import org.hl7.fhir.r5.renderers.utils.RenderingContext.GenerationRules;
 import org.hl7.fhir.r5.utils.EOperationOutcome;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.validation.ValidationMessage;
 import org.hl7.fhir.utilities.xhtml.XhtmlComposer;
 import org.hl7.fhir.validation.ValidatorUtils.SourceFile;
@@ -318,8 +318,7 @@ public class Scanner {
   }
 
   protected void download(String address, String filename) throws IOException {
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    HTTPResult res = http.get(address);
+    HTTPResult res = ManagedWebAccess.get(address);
     res.checkThrowException();
     TextFile.bytesToFile(res.getContent(), filename);
   }
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java
index 29df53882..895bbd2b2 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java
@@ -82,13 +82,13 @@ import org.hl7.fhir.r5.utils.validation.constants.ReferenceValidationPolicy;
 import org.hl7.fhir.utilities.FhirPublication;
 import org.hl7.fhir.utilities.IniFile;
 import org.hl7.fhir.utilities.SIDUtilities;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.TimeTracker;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.npm.CommonPackages;
 import org.hl7.fhir.utilities.npm.FilesystemPackageCacheManager;
 import org.hl7.fhir.utilities.npm.NpmPackage;
@@ -915,8 +915,7 @@ public class ValidationEngine implements IValidatorResourceFetcher, IValidationP
     if (output.startsWith("http://")) {
       ByteArrayOutputStream bs = new ByteArrayOutputStream();
       handleOutputToStream(r, output, bs, version);
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult res = http.post(output, "application/fhir+xml", bs.toByteArray(), "application/fhir+xml");
+      HTTPResult res = ManagedWebAccess.post(output, bs.toByteArray(), "application/fhir+xml", "application/fhir+xml");
       res.checkThrowException();
     } else {
       FileOutputStream s = ManagedFileAccess.outStream(output);
@@ -1073,8 +1072,7 @@ public class ValidationEngine implements IValidatorResourceFetcher, IValidationP
 
   @Override
   public byte[] fetchRaw(IResourceValidator validator, String source) throws IOException {
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    HTTPResult res = http.get(source);
+    HTTPResult res = ManagedWebAccess.get(source);
     res.checkThrowException();
     return res.getContent();
   }
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/cli/utils/ProfileLoader.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/cli/utils/ProfileLoader.java
index 36ce2b154..b73684eb6 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/cli/utils/ProfileLoader.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/cli/utils/ProfileLoader.java
@@ -4,11 +4,11 @@ import java.io.File;
 import java.io.IOException;
 
 import org.hl7.fhir.exceptions.FHIRException;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 
 public class ProfileLoader {
   public static byte[] loadProfileSource(String src) throws FHIRException, IOException {
@@ -25,8 +25,7 @@ public class ProfileLoader {
 
   private static byte[] loadProfileFromUrl(String src) throws FHIRException {
     try {
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult res = http.get(src + "?nocache=" + System.currentTimeMillis());
+      HTTPResult res = ManagedWebAccess.get(src + "?nocache=" + System.currentTimeMillis());
       res.checkThrowException();
       return res.getContent();
     } catch (Exception e) {
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ipa/IPAValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ipa/IPAValidator.java
index a4f366331..327567cc0 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ipa/IPAValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ipa/IPAValidator.java
@@ -7,8 +7,8 @@ import java.util.Map;
 
 import org.hl7.fhir.r5.elementmodel.Element;
 import org.hl7.fhir.r5.elementmodel.JsonParser;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.validation.ValidationMessage;
 import org.hl7.fhir.utilities.validation.ValidationMessage.IssueSeverity;
 import org.hl7.fhir.utilities.validation.ValidationMessage.IssueType;
@@ -160,8 +160,7 @@ public class IPAValidator {
 
   private Element makeRequest(ValidationNode vn, String url)  {
     try {
-      SimpleHTTPClient http = new SimpleHTTPClient();
-      HTTPResult result = http.get(url, "application/fhir+json");
+      HTTPResult result = ManagedWebAccess.get(url, "application/fhir+json");
       if (result.getCode() >= 300) {
         vn.getIssues().add(new ValidationMessage(Source.IPAValidator, IssueType.EXCEPTION, "http.request", 
             "HTTP Return code is "+result.getCode()+" "+result.getMessage(),
diff --git a/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/validation/tests/ValidationTests.java b/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/validation/tests/ValidationTests.java
index 825ea6243..ded31ec63 100644
--- a/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/validation/tests/ValidationTests.java
+++ b/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/validation/tests/ValidationTests.java
@@ -70,12 +70,12 @@ import org.hl7.fhir.r5.utils.validation.constants.CodedContentValidationPolicy;
 import org.hl7.fhir.r5.utils.validation.constants.ContainedReferenceValidationPolicy;
 import org.hl7.fhir.r5.utils.validation.constants.ReferenceValidationPolicy;
 import org.hl7.fhir.utilities.FhirPublication;
-import org.hl7.fhir.utilities.SimpleHTTPClient;
-import org.hl7.fhir.utilities.SimpleHTTPClient.HTTPResult;
 import org.hl7.fhir.utilities.TextFile;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
+import org.hl7.fhir.utilities.http.HTTPResult;
+import org.hl7.fhir.utilities.http.ManagedWebAccess;
 import org.hl7.fhir.utilities.json.JsonException;
 import org.hl7.fhir.utilities.json.JsonTrackingParser;
 import org.hl7.fhir.utilities.json.JsonUtilities;
@@ -828,8 +828,7 @@ public class ValidationTests implements IEvaluationContext, IValidatorResourceFe
 
   @Override
   public byte[] fetchRaw(IResourceValidator validator, String source) throws MalformedURLException, IOException {
-    SimpleHTTPClient http = new SimpleHTTPClient();
-    HTTPResult res = http.get(source);
+    HTTPResult res = ManagedWebAccess.get(source);
     res.checkThrowException();
     return res.getContent();
   }
diff --git a/security.md b/security.md
index b277a6740..68a08fd8b 100644
--- a/security.md
+++ b/security.md
@@ -21,8 +21,19 @@ restricting path access to particular directories.
 # Network access
 
 The library will access the web to download needed collateral, or to access terminology resources or servers.
-All access is by http(s) using the Apache... library, and is controlled by the class XXXX where you can 
-turn all network access off.
+All access is by http(s) using base java http library, and is controlled by the class ManagedWebAccess. You can 
+set the static features of this class to completely cut the library off from the 
+web, or provide your own web accessor, or limit the web resources accessed
+to particular domains or sub-domains. See ManagedWebAccess for details.
+
+Note that for legacy reasons, network access can also be prohibited using 
+FhirSettings.setProhibitNetworkAccess(), but this is deprecated.
+
+Note that libraries that this library depends on may still access the network directly. Review
+of the use of these libraries is ongoing.
+
+Validator: The validator CLI accesses the web to download packages and make use of the
+terminology server, which defaults to https://tx.fhir.org.
 
 # Logging