How to Correctly Send GET Requests with URL-Encoded Slashes?

Sending GET Requests with URL-Encoded Slashes

When attempting to send a GET request to a URL containing a URL-encoded slash (e.g., http://example.com//), you may encounter an issue where the webclient translates it to an invalid URL (e.g., http://example.com//).

To resolve this issue, the following code provides a workaround by forcing the path and query to be treated as canonical:

Uri uri = new Uri("http://example.com/%2F");
ForceCanonicalPathAndQuery(uri);
using (WebClient webClient = new WebClient())
{
  webClient.DownloadData(uri);
}

void ForceCanonicalPathAndQuery(Uri uri){
  string paq = uri.PathAndQuery; // need to access PathAndQuery
  FieldInfo flagsFieldInfo = typeof(Uri).GetField("m_Flags", BindingFlags.Instance | BindingFlags.NonPublic);
  ulong flags = (ulong) flagsFieldInfo.GetValue(uri);
  flags &= ~((ulong) 0x30); // Flags.PathNotCanonical|Flags.QueryNotCanonical
  flagsFieldInfo.SetValue(uri, flags);
}

This script works by manipulating the internal flags of the Uri object, ensuring that it treats the path and query as canonical, not requiring any further transformations during the request.

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