Gitlab username check bug

[manu-chroma]

For gitlab we checking for username bytes inside the response.content from the following url: gitlab.com/<username>

when testing these two urls:

• http://username-check.herokuapp.com/?username=Rohanvdhulla
• http://username-check.herokuapp.com/?username=rohanvdhulla

They both point to same username Rohanvdhulla but the check gives false response in the second case because we're checking for rohanvdhulla instead.

Thus, bytes('rohanvdhulla') in res.content will return false because the page contains Rohanvdhulla instead.

[manu-chroma]

originally reported by @Monal5031