diff --git a/action.yml b/action.yml
index 27df515..5103a71 100644
--- a/action.yml
+++ b/action.yml
@@ -18,6 +18,10 @@ inputs:
     description: "Custom API base URL (for OpenAI-compatible providers). Ignored for built-in providers."
     required: false
     default: ""
+  server_url:
+    description: "Override the Gitea/GitHub server URL used for API calls (e.g. http://server:3000 for internal routing inside the runner). Defaults to the auto-detected server URL."
+    required: false
+    default: ""
   token:
     description: "Git platform token for posting PR comments"
     required: true
diff --git a/entrypoint.sh b/entrypoint.sh
index e5589de..e64cf22 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -11,6 +11,7 @@ export PI_API_KEY="${INPUT_API_KEY}"
 export PI_PROVIDER="${INPUT_PROVIDER:-zai}"
 export PI_MODEL="${INPUT_MODEL:-glm-5.1}"
 export PI_BASE_URL="${INPUT_BASE_URL:-}"
+export PI_SERVER_URL="${INPUT_SERVER_URL:-}"
 export PI_TOOLS="${INPUT_TOOLS:-read,grep,find,ls}"
 export PI_REVIEW_PROMPT="${INPUT_REVIEW_PROMPT:-}"
 export PI_EXCLUDE="${INPUT_EXCLUDE_PATTERNS:-*.lock package-lock.json yarn.lock pnpm-lock.yaml *.min.js *.min.css *.map}"
diff --git a/scripts/review.sh b/scripts/review.sh
index 66c5d65..4c78695 100755
--- a/scripts/review.sh
+++ b/scripts/review.sh
@@ -86,7 +86,12 @@ REPO="${GITHUB_REPOSITORY:-${GITEA_REPOSITORY:-}}"
 
 # Detect Gitea vs GitHub. Gitea sets $GITHUB_SERVER_URL too, so the only
 # reliable signal is $GITEA_ACTIONS (or a non-github.com server URL).
-SERVER_URL="${GITHUB_SERVER_URL:-${GITEA_SERVER_URL:-}}"
+#
+# $PI_SERVER_URL (server_url input) overrides the auto-detected server URL.
+# Gitea reports its *external* hostname (e.g. git.example.com), which may not
+# be routable from inside the runner's container network. Setting server_url
+# to the internal address (e.g. http://server:3000) fixes API calls.
+SERVER_URL="${PI_SERVER_URL:-${GITHUB_SERVER_URL:-${GITEA_SERVER_URL:-}}}"
 if [ -n "${GITEA_ACTIONS:-}" ] || { [ -n "$SERVER_URL" ] && [ "${SERVER_URL#*github.com}" = "$SERVER_URL" ]; }; then
   API_BASE="${SERVER_URL}/api/v1"
   PLATFORM="gitea"