Resolve location url according to RFC #7230

[jsoo1]

Relative locations are allowed when the status code is a redirect. The location url should resolve to the effective request URI: https://tools.ietf.org/html/rfc7230#section-5.5

The issue:

Request http://example.com/redirect
Response { ... statusCode : 303, headers : { Location: "/redirected" ... } }

Expected:
The new request url should be http://example.com/redirected

Actual:
The new request url is /redirected