While here sonatype/restlet1x#4

Then fixing almost all cases: MS IE (how could we miss it?)
and Proxy caches that might cache things between us and
client.

nexus/plugins/restlet1x/nexus-restlet1x-plugin/src/main/java/org/sonatype/nexus/rest/AbstractResourceStoreContentPlexusResource.java

@@ -195,10 +195,12 @@ public Object get( Context context, Request request, Response response, Variant
 
     private void addNoCacheHeaders( final Response response )
     {
-        // NXCM-5155 Force browsers to not cache this page
+        // NEXUS-5155 Force browsers to not cache this page
         final Series<Parameter> headers = ( (HttpResponse) response ).getHttpCall().getResponseHeaders();
-        headers.add( "Pragma", "no-cache" );
-        headers.add( "Cache-Control", "no-cache, no-store, max-age=0, must-revalidate" );
+        headers.add( "Pragma", "no-cache" ); // HTTP/1.0
+        headers.add( "Cache-Control", "no-cache, no-store, max-age=0, must-revalidate" ); // HTTP/1.1
+        headers.add( "Cache-Control", "post-check=0, pre-check=0" ); // MS IE
+        headers.add( "Expires", "0" ); // No caching on Proxies in between client and Nexus
     }
 
     @Override