C# WebRequest.getResponse(): 400 Bad Request
bad-request, c#, webrequest
Solution
By default, the `Uri` class will not allow an escaped `/` character (`%2f`) in a URI (even though this appears to be legal in my reading of RFC 3986).
Uri uri = new Uri("http://example.com/embed%2fded");
Console.WriteLine(uri.AbsoluteUri); // prints: http://example.com/embed/ded
(Note: don't use Uri.ToString to print URIs.)
According to the bug report for this issue on Microsoft Connect, this behaviour is by design, but you can work around it by adding the following to your app.config or web.config file:
<uri>
<schemeSettings>
<add name="http" genericUriParserOptions="DontUnescapePathDotsAndSlashes" />
</schemeSettings>
</uri>
(Since `WebRequest.Create(string)` just delegates to `WebRequest.Create(Uri)`, you would need to use this workaround no matter which method you call.)
Problem
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: ``` http://cdn.somesite.com/r1KH3Z%2FaMY6kLQ9Y4nVxYtlfrcewvKO9HLTCUBjU8IBAYnA3vzE1LGrkqMrR9Nh3jTMVFZzC7mxMBeNK5uY3nx5K0MjUaegM3crVpFNGk6a6TW6NJ3hnlvFuaugE65SQ4yM5754BM%2BLagqYvwvLAhG3DKU9SGUI54UAq3dwMDU%2BMl9lUO18hJF3OtzKiQfrC/the_file.ext ``` The code looks basically like this: ``` HttpWebRequest request = (HttpWebRequest)WebRequest.Create(link); WebResponse response = request.getResponse(); ``` 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. I also tried to decode the link with Uri.UnescapeDataString(link), but that link wont even work in Firefox. Other links work perfectly fine this way.. just these won't work. Edit: Okay, i found something out using wireshark: If i open the link using Firefox, this is sent: ``` &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 ``` I think only the first line is the problem, because WebRequest.Create(link) decodes the url: ``` &MEz.@!dM/nP9@~P>.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 ``` ( %2F is replaced with / ) Another edit: 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. How can I prevent this? Thanks in advance for your help.