fix(postiz): use localhost instead of docker hostname for backend_internal_url

the internal nginx in postiz container requires localhost, not the docker
service name, as this url is used for proxying within the container itself.

.env.example

@@ -430,6 +430,8 @@ GOST_PROXY_URL=
 
 # External upstream proxy (REQUIRED - asked during wizard if gost is selected)
 # Examples: socks5://user:pass@proxy.com:1080, http://user:pass@proxy.com:8080
+# IMPORTANT: For HTTP proxies use http://, NOT https://
+# The protocol refers to proxy type, not connection security.
 GOST_UPSTREAM_PROXY=
 
 # Internal services bypass list (prevents internal Docker traffic from going through proxy)

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## [Unreleased]
 
+## [1.2.4] - 2026-01-30
+
+### Fixed
+- **Postiz** - Fix `BACKEND_INTERNAL_URL` to use `localhost` instead of Docker hostname (internal nginx requires localhost)
+
 ## [1.2.3] - 2026-01-29
 
 ### Fixed

docker-compose.yml

@@ -836,7 +836,7 @@ services:
     restart: always
     environment:
       <<: *proxy-env
-      BACKEND_INTERNAL_URL: http://postiz:3000
+      BACKEND_INTERNAL_URL: http://localhost:3000
       DATABASE_URL: "postgresql://postgres:${POSTGRES_PASSWORD}@postgres:5432/${POSTIZ_DB_NAME:-postiz}?schema=postiz"
       DISABLE_REGISTRATION: ${POSTIZ_DISABLE_REGISTRATION}
       FRONTEND_URL: ${POSTIZ_HOSTNAME:+https://}${POSTIZ_HOSTNAME}

scripts/04_wizard.sh

@@ -215,7 +215,7 @@ if [ $gost_selected -eq 1 ]; then
     EXISTING_UPSTREAM=$(read_env_var "GOST_UPSTREAM_PROXY")
 
     GOST_UPSTREAM_INPUT=$(wt_input "Gost Upstream Proxy" \
-        "Enter your external proxy URL for geo-bypass.\n\nExamples:\n  socks5://user:pass@proxy.com:1080\n  http://user:pass@proxy.com:8080\n\nThis proxy should be located outside restricted regions." \
+        "Enter your external proxy URL for geo-bypass.\n\nExamples:\n  socks5://user:pass@proxy.com:1080\n  http://user:pass@proxy.com:8080\n\nIMPORTANT: For HTTP proxies use http://, NOT https://.\nThe protocol refers to proxy type, not connection security.\n\nThis proxy should be located outside restricted regions." \
         "$EXISTING_UPSTREAM") || true
 
     if [ -n "$GOST_UPSTREAM_INPUT" ]; then