fix #592

jetty-http/src/main/java/org/eclipse/jetty/http/HttpParser.java

@@ -907,7 +907,7 @@ public class HttpParser
 
                     case HOST:
                         _host=true;
-                        if (!(_field instanceof HostPortHttpField))
+                        if (!(_field instanceof HostPortHttpField) && _valueString!=null && !_valueString.isEmpty())
                         {
                             _field=new HostPortHttpField(_header,legacyString(_headerString,_header.asString()),_valueString);
                             add_to_connection_trie=_connectionFields!=null;

jetty-http/src/test/java/org/eclipse/jetty/http/HttpParserTest.java

@@ -1707,6 +1707,21 @@ public class HttpParserTest
         Assert.assertEquals(8888, _port);
     }
 
+    @Test
+    public void testEmptyHostPort() throws Exception
+    {
+        ByteBuffer buffer = BufferUtil.toBuffer(
+                "GET / HTTP/1.1\r\n"
+                        + "Host:\r\n"
+                        + "Connection: close\r\n"
+                        + "\r\n");
+
+        HttpParser.RequestHandler handler = new Handler();
+        HttpParser parser = new HttpParser(handler);
+        parser.parseNext(buffer);
+        Assert.assertEquals(null, _host);
+        Assert.assertEquals(null, _bad);
+    }
     @Test
     public void testCachedField() throws Exception
     {

jetty-server/src/main/java/org/eclipse/jetty/server/Request.java

@@ -1360,12 +1360,14 @@ public class Request implements HttpServletRequest
         HttpField host = metadata==null?null:metadata.getFields().getField(HttpHeader.HOST);
         if (host!=null)
         {
-            // TODO is this needed now?
-            HostPortHttpField authority = (host instanceof HostPortHttpField)
-                ?((HostPortHttpField)host)
-                :new HostPortHttpField(host.getValue());
-            metadata.getURI().setAuthority(authority.getHost(),authority.getPort());
-            return authority.getHost();
+            if (!(host instanceof HostPortHttpField) && host.getValue()!=null && !host.getValue().isEmpty())
+                host=new HostPortHttpField(host.getValue());    
+            if (host instanceof HostPortHttpField)
+            {
+                HostPortHttpField authority = (HostPortHttpField)host;
+                metadata.getURI().setAuthority(authority.getHost(),authority.getPort());
+                return authority.getHost();
+            }
         }
 
         // Return host from connection

jetty-server/src/test/java/org/eclipse/jetty/server/HttpConnectionTest.java

@@ -392,6 +392,27 @@ public class HttpConnectionTest
         checkContains(response,0,"HTTP/1.1 400");
     }
 
+    @Test
+    public void testNoHost() throws Exception
+    {
+        String response;
+
+        response=connector.getResponse("GET / HTTP/1.1\r\n"+
+            "\r\n");
+        checkContains(response,0,"HTTP/1.1 400");
+    }
+
+    @Test
+    public void testEmptyHost() throws Exception
+    {
+        String response;
+
+        response=connector.getResponse("GET / HTTP/1.1\r\n"+
+            "Host:\r\n"+
+            "\r\n");
+        checkContains(response,0,"HTTP/1.1 200");
+    }
+
     @Test
     public void testBadURIencoding() throws Exception
     {

jetty-server/src/test/java/org/eclipse/jetty/server/PartialRFC2616Test.java

@@ -553,7 +553,7 @@ public class PartialRFC2616Test
 
             offset=0;
             response=connector.getResponses("GET /R1 HTTP/1.1\n"+"Host:\n"+"Connection: close\n"+"\n");
-            offset=checkContains(response,offset,"HTTP/1.1 400","400")+1;
+            offset=checkContains(response,offset,"HTTP/1.1 200","200")+1;
         }
     }
 

tests/test-integration/src/test/java/org/eclipse/jetty/test/rfcs/RFC2616BaseTest.java

@@ -1459,7 +1459,7 @@ public abstract class RFC2616BaseTest
             req4.append("\n");
 
             HttpTester.Response response = http.request(req4);
-            assertEquals("14.23 HTTP/1.1 - Empty Host", HttpStatus.BAD_REQUEST_400, response.getStatus());
+            assertEquals("14.23 HTTP/1.1 - Empty Host", HttpStatus.OK_200, response.getStatus());
         }
     }