fix(cloudflare): PPR in wrangler dev (#718)

Author: vicb

.changeset/lucky-actors-flash.md

@@ -0,0 +1,8 @@
+---
+"@opennextjs/aws": patch
+---
+
+fix(cloudflare): PPR in wrangler dev
+
+PPR works fine when deployed but not in dev because of bug in miniflare.
+Adding a workaround until the bug is fixed upstream.

packages/open-next/src/overrides/wrappers/cloudflare-node.ts

@@ -53,6 +53,12 @@ const handler: WrapperHandler<InternalEvent, InternalResult> =
           responseHeaders.append("Set-Cookie", cookie);
         }
 
+        // TODO(vicb): this is a workaround to make PPR work with `wrangler dev`
+        // See https://github.com/cloudflare/workers-sdk/issues/8004
+        if (url.hostname === "localhost") {
+          responseHeaders.set("Content-Encoding", "identity");
+        }
+
         const { readable, writable } = new TransformStream({
           transform(chunk, controller) {
             controller.enqueue(Uint8Array.from(chunk.chunk ?? chunk));