asp.net - The remote server returned an error: (504) Gateway Timeout -

i have created web service using http://visualstudiogallery.msdn.microsoft.com/fbc7e5c1-a0d2-41bd-9d7b-e54c845394cd. hosted on iis , created test app deployed on iis , works. now, hosted wcf service , trying use/consume localhost gives error on following line:

var response = request.getresponse() httpwebresponse;

and error is

the remote server returned error: (504) gateway timeout. 

in fiddler shows:

fiddler] readresponse() failed: server did not return response request.

request header in fiddler is:  post /notifications/recordingcompleted http/1.1  entity:  content-length: 792 content-type: application/json  transport connection: keep-alive expect: 100-continue 

code is:

string servicebaseurl = serviceurlhere string conversationid = 2342423 string resourceurl = ""; string method = "post"; string jsontext = "json here";

       string success = usehttpwebapproach(servicebaseurl, resourceurl, method, jsontext);   private string usehttpwebapproach(string serviceurl, string resourceurl, string method, string requestbody)         {             string responsemessage = null;             var request = webrequest.create(string.concat(serviceurl, resourceurl)) httpwebrequest;             if (request != null)             {                 request.contenttype = "application/json";                 request.method = method;                              }              //var objcontent = httpcontentextensions.createdatacontract(requestbody);             if (method == "post" && requestbody != null)             {                 byte[] requestbodybytes = tobytearrayusingjsoncontractser(requestbody);                 request.contentlength = requestbodybytes.length;                 using (stream poststream = request.getrequeststream())                     poststream.write(requestbodybytes, 0, requestbodybytes.length);              }              if (request != null)             {                 var response = request.getresponse() httpwebresponse;                 if (response.statuscode == httpstatuscode.ok)                 {                     stream responsestream = response.getresponsestream();                     if (responsestream != null)                     {                         var reader = new streamreader(responsestream);                          responsemessage = reader.readtoend();                     }                 }                 else                 {                     responsemessage = response.statusdescription;                 }             }             return responsemessage;         }  private static byte[] tobytearrayusingjsoncontractser(string requestbody) {     byte[] bytes = null;     var serializer1 = new datacontractjsonserializer(typeof(string));     var ms1 = new memorystream();     serializer1.writeobject(ms1, requestbody);     ms1.position = 0;     var reader = new streamreader(ms1);     bytes = ms1.toarray();     return bytes; } 

service code is:

 [servicecontract]     [aspnetcompatibilityrequirements(requirementsmode = aspnetcompatibilityrequirementsmode.allowed)]     [servicebehavior(instancecontextmode = instancecontextmode.percall)]         public class recordingcompleted     {          [webinvoke(uritemplate = "", method = "post")]         public string processcall(string jsondata)         {  return string result }  }