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PO400 Bad request when trying to contact WCF service using XHR
 

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  1. PO400 Bad request when trying to contact WCF service using XHR
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    <p>I'm making a WCF web service that will return a json object, but I keep getting a 400 bad request error when I try to make an AJAX call:</p> <pre><code>OPTIONS http://localhost:55658/WebServiceWrapper.svc/GetData?_=1318567254842&amp;value=97 HTTP/1.1 Host: localhost:55658 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 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 DNT: 1 Connection: keep-alive Origin: http://localhost:3000 Access-Control-Request-Method: GET Access-Control-Request-Headers: content-type HTTP/1.1 400 Bad Request Server: ASP.NET Development Server/10.0.0.0 Date: Fri, 14 Oct 2011 04:40:55 GMT X-AspNet-Version: 4.0.30319 Cache-Control: private Content-Length: 0 Connection: Close </code></pre> <p>Here is my AJAX call:</p> <pre><code>$.ajax({ contentType: 'application/json', url: 'http://localhost:55658/WebServiceWrapper.svc/GetData', dataType: 'json', data: { value: 97 }, success: function (data) { alert('success' + data); }, error: function(XMLHttpRequest, textStatus, errorThrown) { alert('failure' + errorThrown); } }); </code></pre> <p>Here is my WCF service definition:</p> <pre><code>public class WebServiceWrapper : IWebServiceWrapper { public object GetData(int value) { return new { ReturnValue = string.Format("You entered: {0}", value) }; } } </code></pre> <p>And it's interface:</p> <pre><code>[ServiceContract] public interface IWebServiceWrapper { [OperationContract] object GetData(int value); } </code></pre> <p>I know I've solved this problem before, but I can't remember what I had done before. Any help would be greatly appreciated as the hole I'm putting in the wall is just getting bigger and bigger.</p>
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