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POWCF REST Service & iOS Error Handling With NSError
 

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    <p>I have a WCF RESTful service and am trying to sketch out how I will handle errors on the server and various clients. The service will be accessible from both web (jQuery) and iOS products. Here is a look at how I'm throwing errors on the service:</p> <pre><code> [WebGet(UriTemplate = "get/{id}", ResponseFormat = WebMessageFormat.Json)] public Person Get(string id) { //check security if(!SecurityHelper.IsAuthenticated()) { throw new WebFaultException&lt;PersonException&gt;(new PersonException { Reason = "Permission denied." }, HttpStatusCode.Unauthorized); } </code></pre> <p>I can use jQuery to call the service like such:</p> <pre><code> $.ajax({ type: "GET", dataType: "json", url: "/person/get/123", success: function(data) { alert('success'); }, error: function(xhr, status, error) { alert("AJAX Error!"); alert(xhr.responseText); } }); }); </code></pre> <p>...and everything works great - the call is made and the error is thrown (as I have not supplied any authentication) and the error: callback is called. In the error callback when I examine xhr.responseText I get the correct JSON object ({"reason":"Permission denied!"}) showing the error reason that was supplied by the server.</p> <p>Now - I'm trying to put together my iOS app to call the same service and everything is working great from there as well <em>except</em> I can't get the error details that were supplied by the service. Here is the code I have in my call to the REST service from iOS:</p> <pre><code>//set up for any errors NSError *error = nil; //set up response NSURLResponse *response = [[NSURLResponse alloc] init]; //make the request NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&amp;response error:&amp;error]; //check for error if(error) { //debug NSLog(error.description); //send back error return error; } else { </code></pre> <p>In the error.description I'm only getting a generic message like "The operation couldn't be completed."</p> <p>How do I go about getting custom error information that is sent by the server? I've been looking at the userInfo property on the NSError class but cannot figure out if I can get at the custom info and, if so, how I go about doing it.</p> <p>Thanks in advance for any help.</p>
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