Merge branch 'jetty-9.4.x' into jetty-10.0.x

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

@@ -237,7 +237,8 @@ public class MultiPartFormInputStream
         @Override
         public Collection<String> getHeaders(String name)
         {
-            return _headers.getValues(name);
+            Collection<String> headers = _headers.getValues(name);
+            return headers == null ? Collections.emptyList():headers;
         }
 
         @Override

jetty-http/src/main/resources/org/eclipse/jetty/http/mime.properties

@@ -167,6 +167,7 @@ ustar=application/x-ustar
 vcd=application/x-cdlink
 vrml=model/vrml
 vxml=application/voicexml+xml
+wasm=application/wasm
 wav=audio/x-wav
 wbmp=image/vnd.wap.wbmp
 wml=text/vnd.wap.wml

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

@@ -786,6 +786,8 @@ public class MultiPartFormInputStreamTest
         assertThat(stuff.getContentType(), is("text/plain"));
         assertThat(stuff.getHeader("Content-Type"), is("text/plain"));
         assertThat(stuff.getHeaders("content-type").size(), is(1));
+        assertNotNull(stuff.getHeaders("non existing part"));
+        assertThat(stuff.getHeaders("non existing part").size(), is(0));
         assertThat(stuff.getHeader("content-disposition"), is("form-data; name=\"stuff\"; filename=\"" + filename + "\""));
         assertThat(stuff.getHeaderNames().size(), is(2));
         assertThat(stuff.getSize(), is(51L));