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44 lines
1.9 KiB
JavaScript
44 lines
1.9 KiB
JavaScript
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/*
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Copyright 2019 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import { canConstructResponseFromBodyStream } from './_private/canConstructResponseFromBodyStream.js';
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import './_version.js';
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/**
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* Allows developers to copy a response and modify its `headers`, `status`,
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* or `statusText` values (the values settable via a
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* [`ResponseInit`]{@link https://developer.mozilla.org/en-US/docs/Web/API/Response/Response#Syntax}
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* object in the constructor).
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* To modify these values, pass a function as the second argument. That
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* function will be invoked with a single object with the response properties
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* `{headers, status, statusText}`. The return value of this function will
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* be used as the `ResponseInit` for the new `Response`. To change the values
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* either modify the passed parameter(s) and return it, or return a totally
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* new object.
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*
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* @param {Response} response
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* @param {Function} modifier
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* @memberof module:workbox-core
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*/
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async function copyResponse(response, modifier) {
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const clonedResponse = response.clone();
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// Create a fresh `ResponseInit` object by cloning the headers.
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const responseInit = {
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headers: new Headers(clonedResponse.headers),
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status: clonedResponse.status,
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statusText: clonedResponse.statusText,
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};
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// Apply any user modifications.
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const modifiedResponseInit = modifier ? modifier(responseInit) : responseInit;
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// Create the new response from the body stream and `ResponseInit`
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// modifications. Note: not all browsers support the Response.body stream,
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// so fall back to reading the entire body into memory as a blob.
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const body = canConstructResponseFromBodyStream() ?
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clonedResponse.body : await clonedResponse.blob();
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return new Response(body, modifiedResponseInit);
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}
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export { copyResponse };
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