From caef814b0f25994904d9cc18586083228d74e5f4 Mon Sep 17 00:00:00 2001
From: devin ivy <devinivy@gmail.com>
Date: Wed, 18 Jan 2023 17:18:35 -0500
Subject: [PATCH] Fix XRPC fetch usage for newly required duplex option (#470)

Fix xrpc fetch usage for newly required duplex option
---
 packages/xrpc/src/client.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/xrpc/src/client.ts b/packages/xrpc/src/client.ts
index fe6c7fd537b..b8cafc30921 100644
--- a/packages/xrpc/src/client.ts
+++ b/packages/xrpc/src/client.ts
@@ -137,11 +137,15 @@ async function defaultFetchHandler(
   httpReqBody: unknown,
 ): Promise<FetchHandlerResponse> {
   try {
-    const res = await fetch(httpUri, {
+    // The duplex field is now required for streaming bodies, but not yet reflected
+    // anywhere in docs or types. See whatwg/fetch#1438, nodejs/node#46221.
+    const reqInit: RequestInit & { duplex: string } = {
       method: httpMethod,
       headers: httpHeaders,
       body: encodeMethodCallBody(httpHeaders, httpReqBody),
-    })
+      duplex: 'half',
+    }
+    const res = await fetch(httpUri, reqInit)
     const resBody = await res.arrayBuffer()
     return {
       status: res.status,