packages/runtime/src/http-response.ts

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/**
 * A transport that rewrites a response body must not carry over the headers
 * that described the old one. `content-length` becomes a lie the moment the
 * body is re-encoded, and `content-encoding` names a compression that `fetch`
 * has already undone. Both belong to the framing of the response we replaced,
 * not to the one we are handing on.
 */
export function responseWithBody(response: Response, body: BodyInit): Response {
  const headers = new Headers(response.headers);
  headers.delete('content-encoding');
  headers.delete('content-length');
  return new Response(body, {
    status: response.status,
    statusText: response.statusText,
    headers,
  });
}