WCF REST service returns XML for FireFox s/b JSON RSS

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  kgdev

  Member

  2 Points

  5 Posts

  WCF REST service returns XML for FireFox s/b JSON

  Oct 13, 2011 05:51 PM|LINK

  I have a WCF REST application designed to return JSON.

  From IE and CHROME, my request returns JSON (as it should).

  From FireFox, the same request retuns XML, which is the problem.

  I need to get it to return JSON for all browsers.

  The POST header varies from CHROME and FireFox.

  FireFox POST header:

  POST http://devserver/fc/server/fcrestsvr/svcacct/ValidateUser HTTP/1.1
  Host: devserver
  User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: en-us,en;q=0.5
  Accept-Encoding: gzip, deflate
  Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
  Connection: keep-alive
  Content-Type: application/json; charset=UTF-8
  X-Requested-With: XMLHttpRequest
  Referer: http://devserver/fc/client/index.html
  Content-Length: 63
  Pragma: no-cache
  Cache-Control: no-cache
  
  {"AccountID":0,"AccountName":"","LoginName":"a","Password":"a"}

  CHROME header:

  POST http://devserver/fc/server/fcrestsvr/svcacct/ValidateUser HTTP/1.1
  Host: devserver
  Connection: keep-alive
  Content-Length: 63
  Origin: http://devserver
  X-Requested-With: XMLHttpRequest
  User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1
  Content-Type: application/json
  Accept: */*
  Referer: http://devserver/fc/client/fcdev.html
  Accept-Encoding: gzip,deflate,sdch
  Accept-Language: en-US,en;q=0.8
  Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
  
  {"AccountID":0,"AccountName":"","LoginName":"a","Password":"a"}

  I don't control the headers on the GET, as I am using JavaScript framework Ext-JS v4.0.6 and the POST is issued by the data store.

  Here is the WCF REST service code, where I did some experimentation with "WebOperationContext....ContentType" but without success:

      [ServiceContract]

      [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

      [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
      public class svcacct {
          [WebInvoke(Method = "POST", UriTemplate = "ValidateUser",
                  RequestFormat = WebMessageFormat.Json,
                  ResponseFormat = WebMessageFormat.Json,
                  BodyStyle = WebMessageBodyStyle.Bare)]
          public fcdataDTO.AccountItem ValidateUser(fcdataDTO.AccountDTO accountDTO) {
              fcdataDTO.AccountItem ret = fcdata.AccountData.ValidateUser(accountDTO);
              // Trying to resolve problem whereby server returns XML when GET issued from FireFox
              //            WebOperationContext.Current.OutgoingResponse.ContentType = "text/html";
              //            WebOperationContext.Current.OutgoingResponse.ContentType = "application/json";
              if (ret.success == false) {
                  WebOperationContext.Current.OutgoingResponse.StatusCode = System.Net.HttpStatusCode.BadRequest;
                  WebOperationContext.Current.OutgoingResponse.StatusDescription = ret.message;
              }
              return ret;
          }
  
  

  Thank you in advance for your help!

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  SleepyCrat

  Member

  2 Points

  1 Post

  Re: WCF REST service returns XML for FireFox s/b JSON

  Nov 14, 2011 07:56 PM|LINK

  <system.serviceModel>
      <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
      <standardEndpoints>
        <webHttpEndpoint>
          <!--
              Configure the WCF REST service base address via the global.asax.cs file and the default endpoint
              via the attributes on the <standardEndpoint> element below
          -->
          <standardEndpoint name="" helpEnabled="true" automaticFormatSelectionEnabled="false"/>
        </webHttpEndpoint>
      </standardEndpoints>
    </system.serviceModel>

   I solved this problem by changing the

   automaticFormatSelectionEnabled="false"

  attribute of the standardEndpoint element. I changed it to false to force it to use the format I am declaring as an attribute of my functions. If you set it true, it will let the client decide which format to use like what is happening in FireFox.

  Helpful article explaining this attribute

  http://blogs.msdn.com/b/endpoint/archive/2010/01/18/automatic-and-explicit-format-selection-in-wcf-webhttp-services.aspx

  -SleepyCrat
  

  REST Json WCF

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  kgdev

  Member

  2 Points

  5 Posts

  Re: WCF REST service returns XML for FireFox s/b JSON

  Dec 07, 2011 04:40 PM|LINK

  Thank you, SleepyCrat.

  I have been reassigned through the end of the year to a different project, but plan to resume work on this one in January 2012.

  I will try your suggestion at that time and report my results.

  Thanks again!! for responding.

  Bob

  REST Json WCF