Gitlab behind apache reverse proxy doesn't show file information

Summary

Since Gitlab 12.8 when using Apache as a reverse proxy gitlab doesn't show file infos in directory browser.

Steps to reproduce

• Create new gitlab repo
• mkdir -p folder/subfolder
• Put a file in subfolder
• commit and push to gitlab
• Browse to the created file in gitlab

What is the current bug behavior?

When using the GUI to browse the above created structure the columns "Last commit" and "Last update" only show a grey bar and the / in the browser address bar is replaced with %2F after you enter subfolder

If you copy the URL in the address bar to a new tab or another browser gitlab shows an error "folder%2Fsubfolder" did not exist on "master" and displays the root directory of this project.

What is the expected correct behavior?

Gitlab should display the Last commit and Last update info and be able to interpret copied URLs.

Relevant logs and/or screenshots

Screenshot of the directory listing:

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:         Ubuntu 16.04
Current User:   git
Using RVM:      no
Ruby Version:   2.6.5p114
Gem Version:    2.7.10
Bundler Version:1.17.3
Rake Version:   12.3.3
Redis Version:  5.0.7
Git Version:    2.24.1
Sidekiq Version:5.2.7
Go Version:     unknown
GitLab information
Version:        12.8.6
Revision:       5fc76a64537
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     10.12
URL:            https://REDACTED
HTTP Clone URL: https://REDACTED/some-group/some-project.git
SSH Clone URL:  git@REDACTED:some-group/some-project.git
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers: shibboleth
GitLab Shell
Version:        11.0.0
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 11.0.0 ? ... OK (11.0.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Reply by email is disabled in config/gitlab.yml
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
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161/2093 ... yes
713/2094 ... yes
101/2095 ... yes
366/2096 ... yes
3/2097 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.5)
Git version >= 2.22.0 ? ... yes (2.24.1)
Git user has default SSH configuration? ... yes
Active users: ... 877
Is authorized keys file accessible? ... yes
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished

Possible fixes

We use Apache as a reverse proxy in front of gitlab since we depende on Shibboleth as an authentication mechanism. The problem seems to have something to do with escaping in mod_rewrite. Our current RewriteRules are as follows:

  #Rewrites for API-Calls need no escaping
  RewriteCond %{REQUEST_URI} ^/api/v\d+/.*
  RewriteCond %{REQUEST_URI} !/Shibboleth.sso
  RewriteCond %{REQUEST_URI} !/shibboleth-sp
  RewriteRule .* http://127.0.0.1:8181%{REQUEST_URI} [P,QSA,NE]

  #Rewrites for regular calls need escaping
  RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f  [OR]
  RewriteCond %{REQUEST_URI} ^/uploads/.*
  RewriteCond %{REQUEST_URI} !/Shibboleth.sso
  RewriteCond %{REQUEST_URI} !/shibboleth-sp
  RewriteRule .* http://127.0.0.1:8181%{REQUEST_URI} [P,QSA]

These rules have been taken from the official documentation (https://docs.gitlab.com/ee/integration/shibboleth.html#apache-24--gitlab-86-update). Up until Gitlab 12.7 this worked fine.

If I replace the above RewriteRules as follows:

  RewriteCond %{REQUEST_URI} !/Shibboleth.sso
  RewriteCond %{REQUEST_URI} !/shibboleth-sp
  RewriteRule .* http://127.0.0.1:8181%{REQUEST_URI} [P,QSA,NE]

this bug does not occur anymore. However this prevents the Web IDE from working if there are files with special characters (blanks, umlauts etc) (see issue gitlab-foss#45657 (closed))