fetch 'body': don't try to tee() more than once

Author: ximus

packages/kit/src/runtime/server/page/load_data.js

@@ -263,6 +263,9 @@ export function create_universal_fetch(event, state, fetched, csr, resolve_opts)
 			}
 		}
 
+		/** @type {ReadableStream<Uint8Array>} */
+		let teed_body;
+
 		const proxy = new Proxy(response, {
 			get(response, key, _receiver) {
 				/**
@@ -295,6 +298,7 @@ export function create_universal_fetch(event, state, fetched, csr, resolve_opts)
 				}
 
 				if (key === 'body') {
+					if (teed_body) return teed_body;
 					const body = response.body;
 					if (!body) return body;
 					const [a, b] = body.tee();
@@ -321,7 +325,7 @@ export function create_universal_fetch(event, state, fetched, csr, resolve_opts)
 						}
 					}
 					reader.read().then(buffer_to_fetched);
-					return b;
+					return (teed_body = b);
 				}
 
 				if (key === 'arrayBuffer') {