`proxy_headers_hash` appears unused

[dimaqq]

Looks like ConnectionKey.proxy_headers_hash is always None is never used:

[asvetlov]

Yes, you are right. We can drop it I guess.

[Dreamsorcerer]

Isn't it used right here? https://github.com/aio-libs/aiohttp/blob/faa15fd7d1bea808a64f979c1a7ace8340d68d61/aiohttp/client_reqrep.py#L315

[bdraco]

I think this was intended to avoid having to calc the hash every time

[bdraco]

reguardless, it is used

[dimaqq]

If it’s used now, that’s great!

[Dreamsorcerer]

It was used when you opened the issue, that's why I questioned it. Here's a link to the same code at the time you opened the issue: https://github.com/aio-libs/aiohttp/blob/95e548c31efe1f53cc0a5eeb919fa8d9e666f4d9/aiohttp/client_reqrep.py#L265