Proxy fix

[kserhii]

What do these changes do?

• Adds functional proxy tests (proxy_test_server created)
• Fixes client proxy bugs: target path and proxy host header with port

Are there changes in behavior for the user?

HTTPS proxy connection has been fixed.

Related issue number

• Write functional tests for proxy support by client #1218
• Request via aiohttp proxy does not work (url is None) #1413

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new entry to CHANGES.rst
  • Choose any open position to avoid merge conflicts with other PRs.
  • Add a link to the issue you are fixing (if any) using #issue_number format at the end of changelog message. Use Pull Request number if there are no issues for PR or PR covers the issue only partially.

[AraHaan]

Please resolve the conflicts.

[codecov-io]

Current coverage is 98.91% (diff: 100%)

Merging #1421 into master will increase coverage by 0.02%

@@             master      #1421   diff @@
==========================================
  Files            30         30          
  Lines          6930       6932     +2   
  Methods           0          0          
  Messages          0          0          
  Branches       1148       1149     +1   
==========================================
+ Hits           6853       6857     +4   
+ Misses           33         32     -1   
+ Partials         44         43     -1   

Powered by Codecov. Last update 517a38e...6cf2caa

[asvetlov]

I like the PR.
It doesn't check by real proxy server but it's better than current solution.
Also I like changes in aiohttp code itself.

[kserhii]

Thanks a lot :)

[lock]

This thread has been automatically locked since there has not been
any recent activity after it was closed. Please open a new issue for
related bugs.

If you feel like there's important points made in this discussion,
please include those exceprts into that new issue.