[symfony/http-foundation] Request parse_url issue with double slashes

[arku31]

Symfony version(s) affected: 3.4.19 (master v4.2.0 v4.2.0-RC1 v4.1.8 v3.4.19 should be affected as well)

Description
This commit causes the problem - symfony/http-foundation@fbf0364#diff-7edb274bc39ed8c493badba7dd278826

In case of the wrong server configuration, REQUEST_URI could equal to "//api/v1/request"

The result of parse_url in this case is [path] => /v1/request, what is wrong ('/api' is missing).

From one point this is definitely the server misconfiguration but from another point - it works fine in 3.4.18. In most cases, it leads to 404 for routes what previously worked fine.
I think this problem could be popular and should be fixed even that it's not really a problem on your side.
How to reproduce
Easy way is to temporarily hardcode $requestUri equal to "//api/v1/request" on line 1840 in Request.php (link below).
The hard way is to do wrong nginx setup :)

Possible Solution

Do not use parse_url :)

[alquerci]

Thank you @arku31 for creating this bug report! This indeed looks
like a bug. I reproduced the bug with a fresh symfony/website-skeleton running with docker php:7.1-apache.

A curl http://localhost//foo/bar lead to No route found for "GET /bar".

Status: Reviewed

[danijelk]

Have the same issue, took some time to dig down and find it, any ETA on release?

[alquerci]

Thank you @danijelk for your concern, to speed up further you can help to code review the PR #29494.

As I see for now it mostly depends on the availability of a merger.

[acacha]

Also affected by this issue