double slash in URL makes trouble

[individual-it]

Steps to reproduce

1. install owncloud
2. make a request with an extra / in the path e.g. curl -u admin:admin http://localhost/ocs//v1.php/cloud/capabilities

Expected behaviour

owncloud should ignore that extra slash

Actual behaviour

empty answer

Server configuration

Operating system:
Ubuntu 17.10
Web server:
Apache2
Database:
Sqlite
PHP version:
7.1
ownCloud version: (see ownCloud admin page)
10.1 prealpha
Updated from an older ownCloud or fresh install:
fresh
Where did you install ownCloud from:
git

Logs

ownCloud log (data/owncloud.log)

{"reqId":"m35gCX069ytbtcuGbHbQ","level":3,"time":"2018-03-21T03:37:39+00:00","remoteAddr":"127.0.0.1","user":"--","app":"PHP","method":"GET","url":"\/ocs\/\/v1.php\/cloud\/capabilities","message":"Exception: The requested uri(\/ocs\/v1.php\/cloud\/capabilities) cannot be processed by the script '\/ocs\/\/v1.php') at \/home\/artur\/www\/owncloud-core\/lib\/private\/AppFramework\/Http\/Request.php#663"}

[ownclouders]

GitMate.io thinks possibly related issues are #17384 (Double slash in URL gives error page), #9881 (Double-slash at URL root breaks browsing into subdirectories), #20922 (Logout URL missing trailing slash), #9064 (owncloudcmd is doubling URL in request), and #13326 (Make "Download from URL" configurable).

[phil-davis]

This was noticed during some automated acceptance test work, and would be handy to fixup in general so that "people" can build up URL paths without worrying about which bits have / already on the end or at the beginning. If the resulting path has "go nowhere" // then ownCloud still copes.

[individual-it]

fixed by #30848

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