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POC# WebRequest.getResponse(): 400 Bad Request
 

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    <p>I am trying to download a file from a server using System.Web. It actually works, but some links give me trouble. The links look like this:</p> <pre><code>http://cdn.somesite.com/r1KH3Z%2FaMY6kLQ9Y4nVxYtlfrcewvKO9HLTCUBjU8IBAYnA3vzE1LGrkqMrR9Nh3jTMVFZzC7mxMBeNK5uY3nx5K0MjUaegM3crVpFNGk6a6TW6NJ3hnlvFuaugE65SQ4yM5754BM%2BLagqYvwvLAhG3DKU9SGUI54UAq3dwMDU%2BMl9lUO18hJF3OtzKiQfrC/the_file.ext </code></pre> <p>The code looks basically like this:</p> <pre><code>HttpWebRequest request = (HttpWebRequest)WebRequest.Create(link); WebResponse response = request.getResponse(); </code></pre> <p>getResponse() always throws an exception (Error 400 Bad Request). However, I know the link works because I can download the file with Firefox without problems.</p> <p>I also tried to decode the link with Uri.UnescapeDataString(link), but that link wont even work in Firefox. </p> <p>Other links work perfectly fine this way.. just these won't work.</p> <h2>Edit:</h2> <p>Okay, i found something out using wireshark:</p> <p>If i open the link using Firefox, this is sent:</p> <pre><code>&amp;ME3@"dM*PNyAo PA:]GET /r1KH3Z%2FaMY6kLQ9Y4nVxYp5DyNc49t5kJBybvjbcsJJZ0IUJBtBWCgri3zfTERQught6S8ws1a%2BCo0RS5w3KTmbL7i5yytRpn2QELEPUXZTGYWbAg5eyGO2yIIbmGOcFP41WdrFRFcfk4hAIyZ7rs4QgbudzcrJivrAaOTYkEnozqmdoSCCY8yb1i22YtEAV/epd_outpost_12adb.flv HTTP/1.1 Host: cdn.somesite.com User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Connection: keep-alive </code></pre> <p>I think only the first line is the problem, because WebRequest.Create(link) decodes the url:</p> <pre><code>&amp;MEz.@!dM/nP9@~P&gt;.GET /r1KH3Z/aMY6kLQ9Y4nVxYp5DyNc49t5kJBybvjbcsJJZ0IUJBtBWCgri3zfTERQught6S8ws1a%2BCo0RS5w3KTmbL7i5yytRpn2QELEPUXZTGYWbAg5eyGO2yIIbmGOcFP41WdrFRFcfk4hAIyZ7rs6Mmh1EsQQ4vJVYUwtbLBDNx9AwCHlWDfzfSWIHzaaIo/epd_outpost_12adb.flv HTTP/1.1 User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0 Host: cdn.somesite.com </code></pre> <p>( %2F is replaced with / )</p> <h2>Another edit:</h2> <p>I found out that the Uri class decodes the url automatically: Uri uri = new Uri(link); //link is not decoded Debug.WriteLine(uri.ToString()); //link is decoded here.</p> <p>How can I prevent this?</p> <p>Thanks in advance for your help.</p>
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    1. USPascal Ludwig
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    1. COHard to tell, if you don't give the real url. Try to look at the communication that a browser does to get the response (with Live HTTP headers addon, or a tool like Wireshark) - that should give you a hint what to change in your request.
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    2. CO+1 for 'real link'
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    3. COUri class does that, it had a constructor with parameter dontEscape but it's obsolete and does nothing
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      1. USAntonio Bakula
 

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