Adjust path handling for robots.txt and favicon.ico (#33)

* Adjust path handling for robots.txt and favicon.ico

* Add a shorter description

* Add tests

* Update changelog

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 - Add support for running `python -m functions_framework` ([#31])
 - Move `functions_framework.cli.cli` to `functions_framework._cli._cli`
+- Adjust path handling for robots.txt and favicon.ico ([#33])
 
 ## [1.2.0] - 2020-02-20
 ### Added
@@ -43,6 +44,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [1.0.1]: https://github.com/GoogleCloudPlatform/functions-framework-python/releases/tag/v1.0.1
 [1.0.0]: https://github.com/GoogleCloudPlatform/functions-framework-python/releases/tag/v1.0.0
 
+[#33]: https://github.com/GoogleCloudPlatform/functions-framework-python/pull/33
 [#31]: https://github.com/GoogleCloudPlatform/functions-framework-python/pull/31
 [#20]: https://github.com/GoogleCloudPlatform/functions-framework-python/pull/20
 [#14]: https://github.com/GoogleCloudPlatform/functions-framework-python/pull/14

src/functions_framework/__init__.py

@@ -174,8 +174,11 @@ def create_app(target=None, source=None, signature_type=None):
         app.url_map.add(
             werkzeug.routing.Rule("/", defaults={"path": ""}, endpoint="run")
         )
+        app.url_map.add(werkzeug.routing.Rule("/robots.txt", endpoint="error"))
+        app.url_map.add(werkzeug.routing.Rule("/favicon.ico", endpoint="error"))
         app.url_map.add(werkzeug.routing.Rule("/<path:path>", endpoint="run"))
         app.view_functions["run"] = _http_view_func_wrapper(function, flask.request)
+        app.view_functions["error"] = lambda: flask.abort(404, description="Not Found")
     elif signature_type == "event":
         app.url_map.add(
             werkzeug.routing.Rule(

tests/test_functions.py

@@ -376,3 +376,16 @@ def test_http_function_all_methods(method, data):
 
     assert resp.status_code == 200
     assert resp.data == data
+
+
+@pytest.mark.parametrize("path", ["robots.txt", "favicon.ico"])
+def test_error_paths(path):
+    source = TEST_FUNCTIONS_DIR / "http_trigger" / "main.py"
+    target = "function"
+
+    client = create_app(target, source).test_client()
+
+    resp = client.get("/{}".format(path))
+
+    assert resp.status_code == 404
+    assert b"Not Found" in resp.data