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Reuse request so that a ReadableStream body does not become disturbed #26771

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merged 5 commits into from May 3, 2023
Merged

Reuse request so that a ReadableStream body does not become disturbed #26771

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ee88953
clone request
agadzik May 3, 2023
813c1df
handle the case where resource is still a string
agadzik May 3, 2023
bb33b74
reuse the resource as a Request instead of cloning
agadzik May 3, 2023
095ad3a
Handle the case where resource could be a URL
agadzik May 3, 2023
70cf10a
fix prettier error
agadzik May 3, 2023
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8 changes: 7 additions & 1 deletion packages/react/src/ReactFetch.js
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Expand Up @@ -74,7 +74,13 @@ if (enableCache && enableFetchInstrumentation) {
url = resource;
} else {
// Normalize the request.
const request = new Request(resource, options);
// if resource is not a string or a URL (its an instance of Request)
// then do not instantiate a new Request but instead
// reuse the request as to not disturb the body in the event it's a ReadableStream.
const request =
typeof resource === 'string' || resource instanceof URL
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This could in theory be a URL object from a different iframe/realm which is a bit annoying.

? new Request(resource, options)
: resource;
if (
(request.method !== 'GET' && request.method !== 'HEAD') ||
// $FlowFixMe[prop-missing]: keepalive is real
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16 changes: 16 additions & 0 deletions packages/react/src/__tests__/ReactFetch-test.js
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Expand Up @@ -135,6 +135,22 @@ describe('ReactFetch', () => {
expect(fetchCount).toBe(1);
});

// @gate enableFetchInstrumentation && enableCache
it('can dedupe fetches using URL and not', async () => {
const url = 'http://example.com/';
function Component() {
const response = use(fetch(url));
const text = use(response.text());
const response2 = use(fetch(new URL(url)));
const text2 = use(response2.text());
return text + ' ' + text2;
}
expect(await render(Component)).toMatchInlineSnapshot(
`"GET ${url} [] GET ${url} []"`,
);
expect(fetchCount).toBe(1);
});

it('can opt-out of deduping fetches inside of render with custom signal', async () => {
const controller = new AbortController();
function useCustomHook() {
Expand Down