Serve Discourse from a subfolder, Login redirects to root path

zogstrip · December 10, 2025, 10:47pm

@here sorry about that, I think I managed to reproduce and fix the issue

github.com/discourse/discourse

FIX: login redirect to root path in subfolder setup

main ← login-redirect-and-subfolder-equals-boom

opened 10:46PM - 10 Dec 25 UTC

ZogStriP

+43 -16

When Discourse is served from a subfolder (e.g., /forum), logging in from the lo…gin page itself would incorrectly redirect users to the root domain (/) instead of the subfolder root (/forum/). The issue had two causes: 1. The login path check in `extract_redirect_param` used the Rails `login_path` helper which returns "/login" without the subfolder prefix. When the browser sent the full path "/forum/login", the check `starts_with?("/login")` failed to match, treating it as a valid redirect target instead of rejecting it. 2. The `enter` method didn't apply the subfolder prefix when falling back to the root path "/". Fixed by: - Building the full login path with `Discourse.base_path` for accurate matching in subfolder setups - Wrapping the fallback "/" with `path()` in `enter` to respect the subfolder configuration - Extracting redirect validation into `valid_redirect_uri?` for clarity Ref - meta/t/386619

Topic		Replies	Views
Discourse sign in redirects to root directory instead of subfolder Support subfolder	8	91	December 10, 2025
Regression in login behavior Bug	5	694	June 26, 2018
Discourse rewriting url path behaviour failing due to subfolder Bug subfolder	10	1499	August 12, 2018
Home logo url points to the root of the domain even in a subfolder install? Dev	5	1775	October 4, 2016
Recent Changes Breaking Subfolder Setup? Bug	15	1162	February 12, 2020

Serve Discourse from a subfolder, Login redirects to root path

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