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POAdd custom response header; header gets lost when a service calls throws an exception
 

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    <p>I have the following code in my global.asax.cs, to enable cross domain AJAX requests for certain domains:</p> <pre><code> protected void Application_BeginRequest(object sender, EventArgs e) { string whiteList = System.Configuration.ConfigurationManager.AppSettings["AjaxCrossDomainWhitelist"]; if (!string.IsNullOrWhiteSpace(whiteList)) { string[] whiteListDomains = whiteList.Split(';'); string origin = Request.Headers["origin"]; if (!string.IsNullOrEmpty(origin)) { origin = origin.ToLower(); foreach (string domain in whiteListDomains) { if (domain.ToLower() == origin) { HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", domain); break; } } } if (HttpContext.Current.Request.HttpMethod == "OPTIONS") { //These headers are handling the "pre-flight" OPTIONS call sent by the browser HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS"); HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept"); //Access Control policy has a lifetime of one hour HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "3600"); HttpContext.Current.Response.End(); } } } </code></pre> <p>When one of the web services called on the website returns successfully, the "Access-Control-Allow-Origin" header is sent along successfully and everything works fine. However, when a service call causes an exception; the "Access-Control-Allow-Origin" header is still added to the HttpContext.Response; I confirmed as much by trapping Application_EndRequest and checking the Response.Headers collection. However, when I check the sent response in Firebug, Chrome Dev Tools, or Charles, the "Access-Control-Allow-Origin" header was not sent and I can't figure out why.</p> <p>Any pointers?</p>
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