square/retrofit — pull request #617 by JakeWharton (2014-10-03 16:53:53+00:00)
Title: Account for response URL being absent.

According to the documentation[1], this occurs when the response URL is unchanged from the request URL.

[1]: https://cloud.google.com/appengine/docs/java/javadoc/com/google/appengine/api/urlfetch/HTTPResponse#getFinalUrl()

Closes #594

@swankjesse