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    <p>You are encoding the form incorrectly. You should only encode the values:</p> <pre><code>StringBuilder postData = new StringBuilder(); postData.Append("username=" + HttpUtility.UrlEncode(uname) + "&amp;"); postData.Append("password=" + HttpUtility.UrlEncode(pword) + "&amp;"); postData.Append("url_success=" + HttpUtility.UrlEncode(urlSuccess) + "&amp;"); postData.Append("url_failed=" + HttpUtility.UrlEncode(urlFailed)); </code></pre> <p><strong>edit</strong> </p> <p>I was incorrect. According to <a href="https://tools.ietf.org/html/rfc1866#section-8.2" rel="noreferrer">RFC1866 section 8.2.1</a> both names and values should be encoded.</p> <p>But for the given example, the names do not have any characters that needs to be encoded, so in this case my code example is correct ;)</p> <p>The code in the question is still incorrect as it would encode the equal sign which is the reason to why the web server cannot decode it.</p> <p>A more proper way would have been:</p> <pre><code>StringBuilder postData = new StringBuilder(); postData.AppendUrlEncoded("username", uname); postData.AppendUrlEncoded("password", pword); postData.AppendUrlEncoded("url_success", urlSuccess); postData.AppendUrlEncoded("url_failed", urlFailed); //in an extension class public static void AppendUrlEncoded(this StringBuilder sb, string name, string value) { if (sb.Length != 0) sb.Append("&amp;"); sb.Append(HttpUtility.UrlEncode(name)); sb.Append("="); sb.Append(HttpUtility.UrlEncode(value)); } </code></pre>
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    1. POPost form data using HttpWebRequest
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    1. USEvgeny Levin
    1. USjgauffin
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    1. COThanks, butnow I'm getting the following error: The remote server returned an error: (412) Precondition Failed.
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    2. COdid you google it?
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    3. COI google a lot :) But I fixed it, I'm doing it on a dirtry way. I do not a HttpWebRequest but I build a html form inside a String and wirte it to the browser (in the onload I'll do a submit).
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