Change record status: 
Project: 
Introduced in branch: 
9.5.x
Introduced in version: 
9.5.0
Description: 

Drupal now ignores successive slashes in incoming URLs. This is the same behavior as Drupal 7.

Practically, this means empty URL path parts are ignored when matching paths.

Before

https://yourdrupalsite.example.com/some/////path was invalid.

After

https://yourdrupalsite.example.com/some/////path is valid and matches /some/path

Impacts: 
Site builders, administrators, editors
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done