chore: import upstream snapshot with attribution

2026-07-13 13:32:57 +08:00
commit cd420f9332
4811 changed files with 884702 additions and 0 deletions
@@ -0,0 +1,75 @@
+// When proxying long-polling requests, content-encoding & content-length are added
+// erroneously (saying the body is gzipped when it's not) so we'll just remove
+// them to avoid content decoding errors in the browser.
+//
+
+import { logger } from "~/services/logger.server";
+
+// Similar-ish problem to https://github.com/wintercg/fetch/issues/23
+export async function longPollingFetch(
+  url: string,
+  options?: RequestInit,
+  rewriteResponseHeaders?: Record<string, string>
+) {
+  let upstream: Response | undefined;
+  try {
+    upstream = await fetch(url, options);
+    let response = upstream;
+
+    if (response.headers.get("content-encoding")) {
+      const headers = new Headers(response.headers);
+      headers.delete("content-encoding");
+      headers.delete("content-length");
+
+      response = new Response(response.body, {
+        headers,
+        status: response.status,
+        statusText: response.statusText,
+      });
+    }
+
+    if (rewriteResponseHeaders) {
+      const headers = new Headers(response.headers);
+
+      for (const [fromKey, toKey] of Object.entries(rewriteResponseHeaders)) {
+        const value = headers.get(fromKey);
+        if (value) {
+          headers.set(toKey, value);
+          headers.delete(fromKey);
+        }
+      }
+
+      response = new Response(response.body, {
+        headers,
+        status: response.status,
+        statusText: response.statusText,
+      });
+    }
+
+    return response;
+  } catch (error) {
+    // Release upstream undici socket + buffers explicitly. Without this the
+    // ReadableStream stays open and undici keeps buffering chunks into memory
+    // until the upstream times out (see H1 isolation test — ~44 KB retained
+    // per unconsumed-body fetch in RSS).
+    try {
+      await upstream?.body?.cancel();
+    } catch {}
+
+    // AbortError is the expected path when downstream disconnects with a
+    // propagated signal — treat as a clean client-close, not a server error.
+    if (error instanceof Error && error.name === "AbortError") {
+      throw new Response(null, { status: 499 });
+    }
+    if (error instanceof TypeError) {
+      logger.error("Network error:", { error: error.message });
+      throw new Response("Network error occurred", { status: 503 });
+    } else if (error instanceof Error) {
+      logger.error("Fetch error:", { error: error.message });
+      throw new Response(error.message, { status: 500 });
+    } else {
+      logger.error("Unknown error occurred during fetch");
+      throw new Response("An unknown error occurred", { status: 500 });
+    }
+  }
+}