From: Richard Alimi <ralimi@us.ibm.com>

The following is a patch that causes HTTP connections made by llHTTPRequest
to be closed once the response is read.

OpenSim/Region/Environment/Modules/Scripting/HttpRequest/ScriptsHttpRequests.cs

@@ -362,6 +362,11 @@ namespace OpenSim.Region.Environment.Modules.Scripting.HttpRequest
                 finished = true;
                 return;
             }
+            finally
+            {
+                if (response != null)
+                    response.Close();
+            }
 
             status = (int)OSHttpStatusCode.SuccessOk;
             finished = true;