✨ Add FASTAPI_PUBLIC_URL env var to configure app's public URL that is shown on startup (#381)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: YuriiMotov

src/fastapi_cli/cli.py

@@ -1,4 +1,5 @@
 import logging
+import os
 from pathlib import Path
 from typing import Annotated, Any
 
@@ -136,6 +137,7 @@ def _run(
     entrypoint: str | None = None,
     proxy_headers: bool = False,
     forwarded_allow_ips: str | None = None,
+    public_url: str | None = None,
 ) -> None:
     with get_rich_toolkit() as toolkit:
         server_type = "development" if command == "dev" else "production"
@@ -243,7 +245,7 @@ def _run(
                 )
             )
 
-        url = f"http://{host}:{port}"
+        url = public_url.rstrip("/") if public_url else f"http://{host}:{port}"
         url_docs = f"{url}/docs"
 
         toolkit.print_line()
@@ -391,6 +393,7 @@ def dev(
         command="dev",
         proxy_headers=proxy_headers,
         forwarded_allow_ips=forwarded_allow_ips,
+        public_url=os.getenv("FASTAPI_PUBLIC_URL"),
     )
 
 
@@ -498,6 +501,7 @@ def run(
         command="run",
         proxy_headers=proxy_headers,
         forwarded_allow_ips=forwarded_allow_ips,
+        public_url=os.getenv("FASTAPI_PUBLIC_URL"),
     )
 
 

tests/test_cli.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 from unittest.mock import patch
 
+import pytest
 import uvicorn
 from typer.testing import CliRunner
 
@@ -424,6 +425,54 @@ def test_run_env_vars_and_args() -> None:
         assert "Documentation at http://0.0.0.0:8080/docs" in result.output
 
 
+@pytest.mark.parametrize("command", ["dev", "run"])
+@pytest.mark.parametrize(
+    "public_url",
+    [
+        "https://myapp.example.com",
+        "https://myapp.example.com/",
+        "https://myapp.example.com/subpath/",
+    ],
+)
+def test_public_url_env_var(command: str, public_url: str) -> None:
+    with changing_dir(assets_path):
+        with patch.object(uvicorn, "run") as mock_run:
+            result = runner.invoke(
+                app,
+                [
+                    command,
+                    "single_file_app.py",
+                    "--host",
+                    "0.0.0.0",
+                ],
+                env={"FASTAPI_PUBLIC_URL": public_url},
+            )
+            assert result.exit_code == 0, result.output
+            assert mock_run.called
+            assert mock_run.call_args
+            assert mock_run.call_args.kwargs == {
+                "app": "single_file_app:app",
+                "host": "0.0.0.0",
+                "port": 8000,
+                "reload": True if command == "dev" else False,
+                "reload_dirs": None,
+                "workers": None,
+                "root_path": "",
+                "proxy_headers": True,
+                "forwarded_allow_ips": None,
+                "log_config": get_uvicorn_log_config(),
+            }
+
+        assert "Using import string: single_file_app:app" in result.output
+        assert (
+            f"Starting {'development' if command == 'dev' else 'production'} server 🚀"
+            in result.output
+        )
+        expected_url_base = public_url.rstrip("/")
+        assert f"Server started at {expected_url_base}" in result.output
+        assert f"Documentation at {expected_url_base}/docs" in result.output
+
+
 def test_run_error() -> None:
     with changing_dir(assets_path):
         result = runner.invoke(app, ["run", "non_existing_file.py"])