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POIssue when consuming a WCF REST service via jquery ajax call
 

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  1. POIssue when consuming a WCF REST service via jquery ajax call
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    <p>I've been searching long for an answer (on SO too; I know this is not a properly "fresh" question) but I did not find a solution to my problem yet. I have a WCF REST service, defined as follows:</p> <pre><code> [OperationContract] [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare, UriTemplate = "json/getUserOperations")] Response&lt;List&lt;Operation&gt;&gt; GetUserOperations(); </code></pre> <p>with this web.config:</p> <pre><code>&lt;system.serviceModel&gt; &lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior name="WS_REST.DataServiceBehavior"&gt; &lt;serviceMetadata httpGetEnabled="true" /&gt; &lt;serviceDebug includeExceptionDetailInFaults="true" /&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;endpointBehaviors&gt; &lt;behavior name="web"&gt; &lt;webHttp/&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;/behaviors&gt; &lt;services&gt; &lt;service behaviorConfiguration="WS_REST.DataServiceBehavior" name="WS_REST.DataService"&gt; &lt;endpoint address="" binding="webHttpBinding" contract="WS_REST.IDataService" behaviorConfiguration="web"&gt; &lt;identity&gt; &lt;dns value="localhost" /&gt; &lt;/identity&gt; &lt;/endpoint&gt; &lt;/service&gt; &lt;/services&gt; &lt;serviceHostingEnvironment aspNetCompatibilityEnabled="true"/&gt; &lt;/system.serviceModel&gt; </code></pre> <p>This works well if called from browser. But if I call this in jquery ajax, as follows:</p> <pre><code>$.ajax({ url: "http://localhost:1996/DataService.svc/json/getUserOperations", type: "GET", dataType: "json", contentType: "application/json; charset=utf-8", processdata: true, success: processReceivedData, error: onError, complete: function () { alert('completed'); } }); </code></pre> <p>the service returns me a "405 Method not allowed" message. These are the headers of the request and of the response message:</p> <pre><code> OPTIONS http://localhost:1996/DataService.svc/json/getUserOperations HTTP/1.1 Host: localhost:1996 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20100101 Firefox/8.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: it-it,it;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive Origin: http://localhost:2100 Access-Control-Request-Method: GET Access-Control-Request-Headers: content-type HTTP/1.1 405 Method Not Allowed Server: ASP.NET Development Server/9.0.0.0 Date: Mon, 14 Nov 2011 16:28:58 GMT X-AspNet-Version: 2.0.50727 Set-Cookie: ASP.NET_SessionId=0bd0cdyhwyvmuauqcbasvp45; path=/; HttpOnly Cache-Control: private Content-Type: text/html; charset=UTF-8 Content-Length: 1024 Connection: Close </code></pre> <p>So I fell into <a href="https://stackoverflow.com/questions/4875195/problem-sending-json-data-from-jquery-to-wcf-rest-method">this</a>, finding out that it could be some issue related to cross-domain calls, and then I modified my OperationContract as follows:</p> <pre><code> [OperationContract] [WebInvoke(Method = "*", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare, UriTemplate = "json/getUserOperations")] Response&lt;List&lt;Operation&gt;&gt; GetUserOperations(); </code></pre> <p>In this way, the request seems to be correctly served, as the headers show:</p> <pre><code> OPTIONS http://localhost:1996/DataService.svc/json/getUserOperations HTTP/1.1 Host: localhost:1996 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20100101 Firefox/8.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: it-it,it;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive Origin: http://localhost:2100 Access-Control-Request-Method: GET Access-Control-Request-Headers: content-type HTTP/1.1 200 OK Server: ASP.NET Development Server/9.0.0.0 Date: Mon, 14 Nov 2011 16:45:19 GMT X-AspNet-Version: 2.0.50727 Set-Cookie: ASP.NET_SessionId=as4tch55yulzc32fzxsefh2y; path=/; HttpOnly Cache-Control: private Content-Type: application/json; charset=utf-8 Content-Length: 793 Connection: Close </code></pre> <p>The response message actually contains the valid json data which I requested. By the way, the jquery.ajax function still trigger the error event... I don't understand why, as the response seems correctly received. Does anyone notice something wrong? </p> <p>Regards!</p>
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    1. COYour javascript shows "type: "GET"" but the header show 'OPTIONS'. That's strange.
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    2. CORead the "preflighted requests" paragraph; options is involved in cross-domain calls...
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