Why Does My HttpWebRequest with Basic Authentication Fail, and How Can I Fix It?

HttpWebRequest Basic Authentication Troubleshooting

When using HttpWebRequest to establish a Basic Authentication connection to a specific URL, you may encounter a "Sent Unexpected Error" response. This issue may occur when relying on HttpWebRequest's built-in authentication mechanism.

Custom authentication header solution:

To resolve this issue, you can manually add the necessary authorization headers to your request. This is accomplished by setting the header name to "Authorization" and the value to "Basic BASE64({USERNAME:PASSWORD})" .

<code class="language-csharp">string username = "abc";
string password = "123";
string encoded = Convert.ToBase64String(Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
httpWebRequest.Headers.Add("Authorization", "Basic " + encoded);</code>

Note: Please make sure you use ISO-8859-1 encoding for the BASIC authentication string.

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