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POSimple HttpWebRequest over SSL (https) gives 404 Not Found under C#
 

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  1. POSimple HttpWebRequest over SSL (https) gives 404 Not Found under C#
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    <p>I want to make a POST to a php-written Web Service that sits on a secure connection. The following code is just a test console app I wrote after a few hours of trial and error. Essentially, I found out a few different methods to use HttpWebRequest, but all of them are the same thing. </p> <p>Testing my URI with 'http' on a web browser, should return a blank html (with an empty body). This works OK in a browser <strong>and in my code</strong>.</p> <p>I went ahead a tried <a href="http://www.google.com" rel="nofollow noreferrer">http://www.google.com</a> and I got google… (as expected). The problem arises when I change the URI from http to https. Testing my URI with 'https' on a <strong>web browser</strong>, returns the same blank html (this is expected). But when I try the same URI in code, I get a 404 Not Found. </p> <p>Here's the simple code (and the URI) (uncomment the second one to try https):</p> <pre><code>try { string lcUrl = "http://servicios.mensario.com/enviomasivo/apip/"; //string lcUrl = "https://servicios.mensario.com/enviomasivo/apip/"; // *** Establish the request HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUrl); // *** Set properties loHttp.Timeout = 10000; // 10 secs loHttp.Method = "POST"; // I added this for testing, but using GET or commenting this out doesn't change anything. // Retrieve request info headers ******** HERE I GET THE EXCEPTION ********** HttpWebResponse loWebResponse = (HttpWebResponse)loHttp.GetResponse(); // All this code only works when lcUrl is NOT https. Encoding enc = Encoding.GetEncoding(1252); // Windows default Code Page StreamReader loResponseStream = new StreamReader(loWebResponse.GetResponseStream(), enc); string lcHtml = loResponseStream.ReadToEnd(); loWebResponse.Close(); loResponseStream.Close(); } catch ( WebException ex ) { if ( ex.Status == WebExceptionStatus.ProtocolError ) { HttpWebResponse response = ex.Response as HttpWebResponse; if ( response != null ) { // Process response Console.WriteLine(ex.ToString()); } } } Console.Read(); return; </code></pre> <p>The exception is: </p> <blockquote> <p>System.Net.WebException: The remote server returned an error: (404) Not Found. at System.Net.HttpWebRequest.GetResponse()</p> </blockquote> <p><strong>note</strong>: The http url shown here is the real one I have to use, it doesn't belong to me but to another company.</p> <p>If the response were OK, this is what lcHtml should contain:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Since I googled and <em>StackOverflowed</em> a <strong>lot</strong> before posting this question, I found out a few ideas. One is to add the "ignore certificates" code:</p> <pre><code>System.Net.ServicePointManager.ServerCertificateValidationCallback += delegate( object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors ) { return true; // **** Always accept }; </code></pre> <p>That doesn't seem to change anything.</p> <p>Other user said that the SSL Protocol Type might be wrong… so I tried with these two to no avail:</p> <pre><code> ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls; ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; </code></pre> <p>Any ideas?</p> <p><strong>UPDATE</strong> I went back and created a simple console app. The <em>only</em> code is this:</p> <pre><code>WebRequest req = WebRequest.Create("http://servicios.mensario.com/enviomasivo/apip/"); WebResponse resp = req.GetResponse(); </code></pre> <p>That works. No error.</p> <p>However, if I change the URI to https:</p> <pre><code>WebRequest req = WebRequest.Create("https://servicios.mensario.com/enviomasivo/apip/"); WebResponse resp = req.GetResponse(); </code></pre> <p>I get an error (go ahead and try it).</p> <p><em>However</em> <a href="http://www.mensario.com/SEMPROTP/SDK/saldo.php" rel="nofollow noreferrer">this</a> php code seems to work. The only <strong>relevant</strong> line of code that I see different is:</p> <pre><code>curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); </code></pre> <p>The comment, in spanish says: "With this we can ignore the SSL Cert".</p> <p>I think that's the key. But the </p> <pre><code>System.Net.ServicePointManager.ServerCertificateValidationCallback… </code></pre> <p>…stuff, doesn't seem to have the same effect.</p> <p>Thanks in advance.</p>
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    1. USMartin Marconcini
    1. USMartin Marconcini
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    1. CO+1 for using the term "StackOverflowed" as a verb.
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    2. COHehehehe, thanks. ;)
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      1. USMartin Marconcini
 

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