Fix: #4362 - Redirect resolved even though allow_redirects is set to False causing exception for unsupported connection adapter

[luckydenis]

Good evening

The problem was that when checking, we got data that passed the condition test: they contained : , and the request did not start with http. Example 0.0.0.0:8080.

Done:

• [x] Fix #4362
• [x] Add and fix tests
• [x] make test
• [x] flake8 (diff)

[luckydenis]

Good evening, @kennethreitz42

Please review my edits when you have some free time

[nateprewitt]

Hi @LuckyDenis, we're looking at this as a possible candidate for 2.27.0. There was some feedback left in July on the current proposal. Would you have time to rebase this change and address that?