Fix compressed resume proxy responses

src/routes/services.ts

@@ -396,6 +396,17 @@ function parseJsonBody(body: ArrayBuffer | undefined, headers: Headers): JsonObj
   }
 }
 
+function decodedProxyHeaders(headers: Headers) {
+  const forwarded = new Headers(headers);
+  // Node fetch transparently decodes gzip/br bodies but retains the upstream
+  // encoding and byte-length headers. Forwarding those stale headers makes the
+  // next proxy/browser decode an already-decoded body and fail.
+  forwarded.delete("content-encoding");
+  forwarded.delete("content-length");
+  forwarded.delete("transfer-encoding");
+  return forwarded;
+}
+
 async function proxyResumeRequest(req: Request, rest: string, userId: string) {
   const incoming = new URL(req.url);
   const normalizedRest = rest
@@ -419,6 +430,7 @@ async function proxyResumeRequest(req: Request, rest: string, userId: string) {
   headers.delete("cookie");
   headers.set("authorization", `Bearer ${config.a2aAllowedKey}`);
   headers.set("x-growqr-user", userId);
+  headers.set("accept-encoding", "identity");
 
   const method = req.method.toUpperCase();
   const body = ["GET", "HEAD"].includes(method) ? undefined : await req.arrayBuffer();
@@ -436,7 +448,11 @@ async function proxyResumeRequest(req: Request, rest: string, userId: string) {
   });
 
   if (method === "GET" || method === "HEAD") {
-    return new Response(res.body, { status: res.status, statusText: res.statusText, headers: res.headers });
+    return new Response(res.body, {
+      status: res.status,
+      statusText: res.statusText,
+      headers: decodedProxyHeaders(res.headers),
+    });
   }
 
   const responseBuffer = await res.arrayBuffer();
@@ -461,7 +477,7 @@ async function proxyResumeRequest(req: Request, rest: string, userId: string) {
   return new Response(responseBuffer, {
     status: res.status,
     statusText: res.statusText,
-    headers: res.headers,
+    headers: decodedProxyHeaders(res.headers),
   });
 }