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copied!<p><strong>TL;DR</strong> - Catch exception in Python and send a custom JSON object, with the message you want to display to the client, back to Flex.</p> <p>This is the pattern I follow. The example I am going to give is in C# but I am assuming the same principles can be applied to Python.</p> <p>I handle the exception in the web service and send a JSON object containing the error I would like to display to the user.</p> <p>Here I am catching the error:</p> <pre><code>try { string jsonResponse = doStuff(); return Json(jsonResponse, JsonRequestBehavior.AllowGet); } catch (Exception ex) { return Json(new GetTokenError(ex.Message), JsonRequestBehavior.AllowGet); } </code></pre> <p>Here is the return object I use to convert to JSON and return to the client:</p> <pre><code>/// <summary> /// Used for displaying consistent error messages /// </summary> public class GetTokenError { /// <summary> /// Ctor /// </summary> /// <param name="error">Error message to display</param> public GetTokenError(string error) { this.error = error; } /// <summary> /// The error to display /// </summary> public string error { get; set; } } </code></pre> <p>Using this method will always return a 200 unless there is something wrong with your web server, the connection between the client and web server, or gremlins have infected your machine.</p> <p>As for the flex side, here are my result handlers:</p> <pre><code>var http:HTTPService = new HTTPService(); http.method = "POST"; http.resultFormat = HTTPService.RESULT_FORMAT_TEXT; http.url = "http://url.com"; http.addEventListener(ResultEvent.RESULT, function(evt:ResultEvent):void { try { var ret:Object = JSON.decode(evt.result.toString()); if (ret.error) { // handle server error } // go about task } catch (e:Error) { // handle local error } }); http.addEventListener(FaultEvent.FAULT, function(ex:FaultEvent):void { // handle error with the call }); http.send(); </code></pre>

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