aiohttp 3.5.1 munges request url

[khazhyk]

Long story short

aiohttp.get(url) modifies url to something else, resulting in not being able to fetch that URL

import aiohttp
s = aiohttp.ClientSession()
resp = s.get('https://images-ext-2.discordapp.net/external/n945pegasec2-Y2fwHmMso5IqqPmBSKB883Nid5_xMw/%3Fsize%3D1024/https/images.discordapp.net/avatars/86699011792191488/e8b87f5087ab1e4b722dee85f4831204.png')
resp.url # 'https://images-ext-2.discordapp.net/external/n945pegasec2-Y2fwHmMso5IqqPmBSKB883Nid5_xMw/%3Fsize=1024/https/images.discordapp.net/avatars/86699011792191488/e8b87f5087ab1e4b722dee85f4831204.png'

Expected behaviour

It should request the correct url

Actual behaviour

It requests the wrong url (it seems to improperly convert %3D to =, which gives a different and incorrect url)

Steps to reproduce

import aiohttp
s = aiohttp.ClientSession()
resp = s.get('https://images-ext-2.discordapp.net/external/n945pegasec2-Y2fwHmMso5IqqPmBSKB883Nid5_xMw/%3Fsize%3D1024/https/images.discordapp.net/avatars/86699011792191488/e8b87f5087ab1e4b722dee85f4831204.png')
resp.url # 'https://images-ext-2.discordapp.net/external/n945pegasec2-Y2fwHmMso5IqqPmBSKB883Nid5_xMw/%3Fsize=1024/https/images.discordapp.net/avatars/86699011792191488/e8b87f5087ab1e4b722dee85f4831204.png'

Your environment

aiohttp 3.5.1
linux
python 3.6.5

[aio-libs-bot]

GitMate.io thinks the contributor most likely able to help you is @asvetlov.

Possibly related issues are #660 (aiohttp.request hangs on some URLs), #2920 (AIOHttp failing after some requests), #1290 (aiohttp 1.1), #2829 (aiohttp 3.1 release), and #1403 ([QUESTION] aiohttp.ClientSession.request('GET') issue).

[kxepal]

This is duplicate of #3424. Solution could be found in the first comment.

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