Suggestion for dealing with spaces in url

[jwiater]

Hi

I found another thing If there is a space in the url itself, not just the query string we have the same problem.

If the url contains space, normally it is encoded to + or %20 But then it is encoded again with the % to %25 so the %20 becomes %2520

AWS complains about that – the message that “the canonical string should be …”

The solution is to Escape also the URL, but one must be careful since it wants to encode also the / characters:

So:

In the place where you have:

canonical_request.Append( request.RequestUri.AbsolutePath + "\n" );

use this:

string sanitizedUrl = SanitizeUrl( request.RequestUri.AbsolutePath ); canonical_request.Append( sanitizedUrl + "\n" );

and add SanitizeUrl method:

private string SanitizeUrl( string absolutePath ) { StringBuilder sb = new StringBuilder(); string[] segments = absolutePath.Split( new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries );

foreach( var s in segments )
{
    sb.Append( "/" );
    sb.Append( Uri.EscapeDataString( s ) );
}

return sb.ToString();

}

Thank you

[tsibelman]

Can you give me an example url

[jwiater]

imagine passing parameters in url path, not query string:

htttp://someservice/someGetRequest/resourceType/nice%20things

Something like that would fail

[jwiater]

Example of API Gateway service using path parameters

[tsibelman]

I made a new version with this change.