Move RSS response headers into app

tests/test_dev_mode.py

@@ -133,5 +133,42 @@ def test_published_rss_rewrites_feed_url_to_https_host_header(
             "<link>https://example.com/article</link>"
             "</channel></rss>\n"
         )
+        assert response.headers["Access-Control-Allow-Origin"] == "*"
+        assert response.headers["Access-Control-Allow-Methods"] == "GET, HEAD, OPTIONS"
+        assert response.headers["Access-Control-Allow-Headers"] == "*"
+        assert response.cache_control.public is True
+        assert response.cache_control.max_age == 300
+        assert response.headers["ETag"] != ""
+
+    asyncio.run(run())
+
+
+def test_published_rss_supports_conditional_requests(
+    monkeypatch, tmp_path: Path
+) -> None:
+    db_path = tmp_path / "conditional-rss.db"
+    feeds_dir = tmp_path / "out" / "feeds"
+    monkeypatch.setenv("REPUBLISHER_DB_PATH", str(db_path))
+
+    async def run() -> None:
+        app = create_app()
+        app.config["REPUB_FEEDS_DIR"] = feeds_dir
+        feed_path = feeds_dir / "demo-source" / "feed.rss"
+        feed_path.parent.mkdir(parents=True)
+        feed_path.write_text(
+            "<rss><channel><title>Demo</title></channel></rss>\n", encoding="utf-8"
+        )
+
+        client = app.test_client()
+        first_response = await client.get("/feeds/demo-source/feed.rss")
+        etag = first_response.headers["ETag"]
+        second_response = await client.get(
+            "/feeds/demo-source/feed.rss",
+            headers={"If-None-Match": etag},
+        )
+
+        assert second_response.status_code == 304
+        assert await second_response.get_data(as_text=True) == ""
+        assert second_response.headers["ETag"] == etag
 
     asyncio.run(run())