Hi karl,

Of course it is correct that the user agent is redirected to http://example.com/bar#test when it got such response. However, it never means UA can send an HTTP request containing fragment part.

In RFC7230 section 3.1.1, HTTP request line is defined as:
    request-line   = method SP request-target SP HTTP-version CRLF
where request-target is defined in section 5.3. In usual case, it is origin-form:
    origin-form    = absolute-path [ "?" query ]
which never includes fragment part.

This means current urllib behavior violates HTTP/1.1 spec.