Uvicorn: Httptools trims long urls

[euri10]

Prompted as part of the discussion in #344 , it seems httptools doenst handle well long url, see #925 for a failing test

I can say that for my case the issue is not URLs longer than 65,535 characters, but rather that on_url is being called multiple times for whatever reason: https://github.com/nodejs/http-parser#parsing-urls.

_Originally posted by @malthejorgensen in https://github.com/encode/uvicorn/issues/344#issuecomment-752074479_

[victoraugustolls]

@euri10 There is a pr to move httptools from http-parser tô llhttp. If the bug is in http-parser, this might help!

[euri10]

Cool, I subscribed to it thanks for the heads up @victoraugustolls !