[PR #237] [MERGED] fix: improve reverse proxy support for subdomain deployments #1855

New Issue

GiteaMirror · 2026-04-27T19:13:46-05:00

GiteaMirror commented

2026-04-27 19:13:46 -05:00

📋 Pull Request Information

Original PR: https://github.com/RayLabsHQ/gitea-mirror/pull/237
Author: @arunavo4
Created: 3/18/2026
Status: ✅ Merged
Merged: 3/18/2026
Merged by: @arunavo4

Base: main ← Head: fix/63-reverse-proxy-support

📝 Commits (4)

470be29 fix: improve reverse proxy support for subdomain deployments (#63)
9b99e5e fix: address review findings for reverse proxy origin detection
60034c5 fix: handle multi-value x-forwarded-host in chained proxy setups
2e2b420 test: add unit tests for reverse proxy origin detection

📊 Changes

7 files changed (+268 additions, -46 deletions)

View changed files

📝 .env.example (+18 -1)
📝 docker-compose.alt.yml (+4 -0)
📝 docker-compose.yml (+7 -0)
➕ src/lib/auth-origins.test.ts (+119 -0)
📝 src/lib/auth.ts (+71 -42)
📝 src/pages/api/sse/index.ts (+1 -0)
📝 src/pages/docs/advanced.astro (+48 -3)

📄 Description

Summary

Fixes #63 — app doesn't work when accessed via a reverse proxy subdomain (e.g., gitea-mirror.mydomain.tld). Pages show no content and users can't sign in.

Root cause

Better Auth's trustedOrigins only included http://localhost:4321 by default. When the browser sends Origin: https://gitea-mirror.mydomain.tld, it was rejected as "invalid origin". Additionally, SSE streams were buffered by Nginx, breaking real-time updates.

Changes

Auto-detect origin from request headers (src/lib/auth.ts)

Changed trustedOrigins from a static IIFE to an async function that receives the incoming request
Auto-detects origin from X-Forwarded-Host/Host + X-Forwarded-Proto headers for per-request CSRF validation
Handles multi-value X-Forwarded-Host and X-Forwarded-Proto (chained proxy setups) — takes first value only
Validates proto is strictly "http" or "https"
Restores startup logging of static trusted origins for debugging

SSE buffering fix (src/pages/api/sse/index.ts)

Added X-Accel-Buffering: no response header to prevent Nginx from buffering the SSE stream

Documentation (src/pages/docs/advanced.astro)

Added prominent red warning callout: BETTER_AUTH_URL, PUBLIC_BETTER_AUTH_URL, and BETTER_AUTH_TRUSTED_ORIGINS are mandatory for reverse proxy deployments
Added Docker Compose example with required env vars
Added X-Forwarded-For, X-Forwarded-Proto, Host headers to Nginx SSE example

Config/Docker (.env.example, docker-compose.yml, docker-compose.alt.yml)

Added dedicated "REVERSE PROXY CONFIGURATION" section in .env.example
Added PUBLIC_BETTER_AUTH_URL and BETTER_AUTH_TRUSTED_ORIGINS to docker-compose.yml
Added reverse proxy comments to docker-compose.alt.yml

Test plan

All 171 tests pass
Production build succeeds
Rebased cleanly onto main (after PR #235 and #236 merges)

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/RayLabsHQ/gitea-mirror/pull/237 **Author:** [@arunavo4](https://github.com/arunavo4) **Created:** 3/18/2026 **Status:** ✅ Merged **Merged:** 3/18/2026 **Merged by:** [@arunavo4](https://github.com/arunavo4) **Base:** `main` ← **Head:** `fix/63-reverse-proxy-support` --- ### 📝 Commits (4) - [`470be29`](https://github.com/RayLabsHQ/gitea-mirror/commit/470be29d2816f0d5cf446389ccf967f39a503a8b) fix: improve reverse proxy support for subdomain deployments (#63) - [`9b99e5e`](https://github.com/RayLabsHQ/gitea-mirror/commit/9b99e5e63227e06dcbeba70563bd2609dbb770e2) fix: address review findings for reverse proxy origin detection - [`60034c5`](https://github.com/RayLabsHQ/gitea-mirror/commit/60034c5395c8284331669d2fd0ddf744c20db4b3) fix: handle multi-value x-forwarded-host in chained proxy setups - [`2e2b420`](https://github.com/RayLabsHQ/gitea-mirror/commit/2e2b42058473ce155004a337fcc23a2d0f3a451b) test: add unit tests for reverse proxy origin detection ### 📊 Changes **7 files changed** (+268 additions, -46 deletions) <details> <summary>View changed files</summary> 📝 `.env.example` (+18 -1) 📝 `docker-compose.alt.yml` (+4 -0) 📝 `docker-compose.yml` (+7 -0) ➕ `src/lib/auth-origins.test.ts` (+119 -0) 📝 `src/lib/auth.ts` (+71 -42) 📝 `src/pages/api/sse/index.ts` (+1 -0) 📝 `src/pages/docs/advanced.astro` (+48 -3) </details> ### 📄 Description ## Summary Fixes #63 — app doesn't work when accessed via a reverse proxy subdomain (e.g., `gitea-mirror.mydomain.tld`). Pages show no content and users can't sign in. ### Root cause Better Auth's `trustedOrigins` only included `http://localhost:4321` by default. When the browser sends `Origin: https://gitea-mirror.mydomain.tld`, it was rejected as "invalid origin". Additionally, SSE streams were buffered by Nginx, breaking real-time updates. ### Changes **Auto-detect origin from request headers** (`src/lib/auth.ts`) - Changed `trustedOrigins` from a static IIFE to an async function that receives the incoming request - Auto-detects origin from `X-Forwarded-Host`/`Host` + `X-Forwarded-Proto` headers for per-request CSRF validation - Handles multi-value `X-Forwarded-Host` and `X-Forwarded-Proto` (chained proxy setups) — takes first value only - Validates proto is strictly `"http"` or `"https"` - Restores startup logging of static trusted origins for debugging **SSE buffering fix** (`src/pages/api/sse/index.ts`) - Added `X-Accel-Buffering: no` response header to prevent Nginx from buffering the SSE stream **Documentation** (`src/pages/docs/advanced.astro`) - Added prominent red warning callout: `BETTER_AUTH_URL`, `PUBLIC_BETTER_AUTH_URL`, and `BETTER_AUTH_TRUSTED_ORIGINS` are mandatory for reverse proxy deployments - Added Docker Compose example with required env vars - Added `X-Forwarded-For`, `X-Forwarded-Proto`, `Host` headers to Nginx SSE example **Config/Docker** (`.env.example`, `docker-compose.yml`, `docker-compose.alt.yml`) - Added dedicated "REVERSE PROXY CONFIGURATION" section in `.env.example` - Added `PUBLIC_BETTER_AUTH_URL` and `BETTER_AUTH_TRUSTED_ORIGINS` to `docker-compose.yml` - Added reverse proxy comments to `docker-compose.alt.yml` ## Test plan - [x] All 171 tests pass - [x] Production build succeeds - [x] Rebased cleanly onto main (after PR #235 and #236 merges) --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror added the pull-request label 2026-04-27 19:13:46 -05:00

GiteaMirror closed this issue

2026-04-27 19:13:48 -05:00

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Reference: github-starred/gitea-mirror#1855