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PO.NET 4.5 HttpClient PUT or POST over SSL always fails
 

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  1. PO.NET 4.5 HttpClient PUT or POST over SSL always fails
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    <p>I am having a terrible time troubleshooting this issue. I'm also having a terrible time reproducing it consistently from one application to another.</p> <p>Under certain circumstances, which I cannot seem to identify, making <code>PUT</code> and <code>POST</code> calls using the <code>HttpClient</code> results in the following exception.</p> <blockquote> <p>An error occurred while sending the request.</p> <p>Inner Exception:<br> The underlying connection was closed: An unexpected error occurred on a send.</p> <p>Inner Exception:<br/> This operation cannot be performed on a completed asynchronous result object.</p> </blockquote> <p>Everything seems to work with HTTP, this only happens on HTTPS.</p> <p>Certificates are valid, but I have tried setting the <code>ServicePointManager.ServerCertificateValidationCallback += (s, c, ch, es) => true;</code></p> <p>I have tried setting <code>client.DefaultRequestHeaders.ExpectContinue = false;</code></p> <p>I have tried, what seems like a million, other things ranging from headers, authentication, etc.</p> <p>Does anyone have any idea what else I can check, try, etc?</p> <p>Code snippet:</p> <pre><code>// this is my registration in my IoC container... var handler = new HttpClientHandler { UseDefaultCredentials = true, Credentials = CredentialCache.DefaultNetworkCredentials, }; var client = HttpClientFactory.Create(handler); client.BaseAddress = new Uri(Properties.Settings.Default.BaseUrl); client.DefaultRequestHeaders.Add("X-CustomHeader", "value"); // _client is constructor injected into my class... var response = await _client.PutAsJsonAsync("api/resource/" + id, model).ConfigureAwait(false); response.EnsureSuccessStatusCode(); // &lt;-- never executes... </code></pre> <p><strong>UPDATE:</strong></p> <p>If I take off the <code>ConfigureAwait(false)</code> it works fine.</p> <p>Note, this is a WPF app, specifically, this is a Visual Studio extension. However, I do have an ASP.NET MVC 4 application with the exact same problem, and that application does not call <code>ConfigureAwait(false)</code> at all...</p> <p><strong>UPDATE 2:</strong></p> <p>I updated the code snippet to include the instantiation of the <code>HttpClient</code> class. The only thing that is not included in the code snippet is the model type and declaration. It should be irrelevant, as it is a serializable class with all auto properties with no complex types.</p> <p><strong>UPDATE 3:</strong></p> <p>I don't know if this is relevant, but I have found a few things which look weird to me.</p> <p>When executing the above code, in Fiddler, I get a <code>401</code> on the <code>POST</code>, followed by 2 <code>CONNECT</code>'s which result in the following HTTP responses:</p> <blockquote> <p>HTTP/1.1 200 Connection Established<br> Connection: close</p> </blockquote> <p><strong>UPDATE 4:</strong></p> <p>I changed my IoC registration code to be this:</p> <pre><code>var handler = new HttpClientHandler { UseDefaultCredentials = true, Credentials = CredentialCache.DefaultCredentials, }; var client = HttpClientFactory.Create(handler); client.BaseAddress = new Uri(Properties.Settings.Default.BaseUrl); client.DefaultRequestHeaders.Add("X-CustomHeader", "value"); </code></pre> <p>and now it fails, but when I open Fiddler and let it decrypt traffic ... it works!</p> <p><strong>UPDATE 5:</strong></p> <p>I believe this must be a server issue, or a cert issue. Any tips on what to check from here would be greatly appreciated. Certs are valid and issued from a trusted CA.</p> <p><strong>UPDATE 6:</strong></p> <p>More debugging and troubleshooting. The exception occurs before the <code>ServicePointManager</code> <code>CertificateValidationCallback</code> is invoked.</p>
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    1. COShow an excerpt of the actual sending code.
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    2. COAdded code snippet, but it is really just basic usage. Nothing fancy.
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    3. COAre you disposing `_client` before the request completes? Can you post a minimal repro?
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      1. USStephen Cleary
 

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