next
Version:
The React Framework
302 lines (300 loc) • 14.7 kB
JavaScript
'use client';
;
Object.defineProperty(exports, "__esModule", {
value: true
});
0 && (module.exports = {
createFetch: null,
createFromNextReadableStream: null,
fetchServerResponse: null
});
function _export(target, all) {
for(var name in all)Object.defineProperty(target, name, {
enumerable: true,
get: all[name]
});
}
_export(exports, {
createFetch: function() {
return createFetch;
},
createFromNextReadableStream: function() {
return createFromNextReadableStream;
},
fetchServerResponse: function() {
return fetchServerResponse;
}
});
const _client = require("react-server-dom-webpack/client");
const _approuterheaders = require("../app-router-headers");
const _appcallserver = require("../../app-call-server");
const _appfindsourcemapurl = require("../../app-find-source-map-url");
const _routerreducertypes = require("./router-reducer-types");
const _flightdatahelpers = require("../../flight-data-helpers");
const _appbuildid = require("../../app-build-id");
const _setcachebustingsearchparam = require("./set-cache-busting-search-param");
const _routeparams = require("../../route-params");
const createFromReadableStream = _client.createFromReadableStream;
function doMpaNavigation(url) {
return {
flightData: (0, _routeparams.urlToUrlWithoutFlightMarker)(new URL(url, location.origin)).toString(),
canonicalUrl: undefined,
couldBeIntercepted: false,
prerendered: false,
postponed: false,
staleTime: -1
};
}
let abortController = new AbortController();
if (typeof window !== 'undefined') {
// Abort any in-flight requests when the page is unloaded, e.g. due to
// reloading the page or performing hard navigations. This allows us to ignore
// what would otherwise be a thrown TypeError when the browser cancels the
// requests.
window.addEventListener('pagehide', ()=>{
abortController.abort();
});
// Use a fresh AbortController instance on pageshow, e.g. when navigating back
// and the JavaScript execution context is restored by the browser.
window.addEventListener('pageshow', ()=>{
abortController = new AbortController();
});
}
async function fetchServerResponse(url, options) {
const { flightRouterState, nextUrl, prefetchKind } = options;
const headers = {
// Enable flight response
[_approuterheaders.RSC_HEADER]: '1',
// Provide the current router state
[_approuterheaders.NEXT_ROUTER_STATE_TREE_HEADER]: (0, _flightdatahelpers.prepareFlightRouterStateForRequest)(flightRouterState, options.isHmrRefresh)
};
/**
* Three cases:
* - `prefetchKind` is `undefined`, it means it's a normal navigation, so we want to prefetch the page data fully
* - `prefetchKind` is `full` - we want to prefetch the whole page so same as above
* - `prefetchKind` is `auto` - if the page is dynamic, prefetch the page data partially, if static prefetch the page data fully
*/ if (prefetchKind === _routerreducertypes.PrefetchKind.AUTO) {
headers[_approuterheaders.NEXT_ROUTER_PREFETCH_HEADER] = '1';
}
if (process.env.NODE_ENV === 'development' && options.isHmrRefresh) {
headers[_approuterheaders.NEXT_HMR_REFRESH_HEADER] = '1';
}
if (nextUrl) {
headers[_approuterheaders.NEXT_URL] = nextUrl;
}
try {
var _res_headers_get;
// When creating a "temporary" prefetch (the "on-demand" prefetch that gets created on navigation, if one doesn't exist)
// we send the request with a "high" priority as it's in response to a user interaction that could be blocking a transition.
// Otherwise, all other prefetches are sent with a "low" priority.
// We use "auto" for in all other cases to match the existing default, as this function is shared outside of prefetching.
const fetchPriority = prefetchKind ? prefetchKind === _routerreducertypes.PrefetchKind.TEMPORARY ? 'high' : 'low' : 'auto';
if (process.env.NODE_ENV === 'production') {
if (process.env.__NEXT_CONFIG_OUTPUT === 'export') {
// In "output: export" mode, we can't rely on headers to distinguish
// between HTML and RSC requests. Instead, we append an extra prefix
// to the request.
url = new URL(url);
if (url.pathname.endsWith('/')) {
url.pathname += 'index.txt';
} else {
url.pathname += '.txt';
}
}
}
const res = await createFetch(url, headers, fetchPriority, abortController.signal);
const responseUrl = (0, _routeparams.urlToUrlWithoutFlightMarker)(new URL(res.url));
const canonicalUrl = res.redirected ? responseUrl : undefined;
const contentType = res.headers.get('content-type') || '';
const interception = !!((_res_headers_get = res.headers.get('vary')) == null ? void 0 : _res_headers_get.includes(_approuterheaders.NEXT_URL));
const postponed = !!res.headers.get(_approuterheaders.NEXT_DID_POSTPONE_HEADER);
const staleTimeHeaderSeconds = res.headers.get(_approuterheaders.NEXT_ROUTER_STALE_TIME_HEADER);
const staleTime = staleTimeHeaderSeconds !== null ? parseInt(staleTimeHeaderSeconds, 10) * 1000 : -1;
let isFlightResponse = contentType.startsWith(_approuterheaders.RSC_CONTENT_TYPE_HEADER);
if (process.env.NODE_ENV === 'production') {
if (process.env.__NEXT_CONFIG_OUTPUT === 'export') {
if (!isFlightResponse) {
isFlightResponse = contentType.startsWith('text/plain');
}
}
}
// If fetch returns something different than flight response handle it like a mpa navigation
// If the fetch was not 200, we also handle it like a mpa navigation
if (!isFlightResponse || !res.ok || !res.body) {
// in case the original URL came with a hash, preserve it before redirecting to the new URL
if (url.hash) {
responseUrl.hash = url.hash;
}
return doMpaNavigation(responseUrl.toString());
}
// We may navigate to a page that requires a different Webpack runtime.
// In prod, every page will have the same Webpack runtime.
// In dev, the Webpack runtime is minimal for each page.
// We need to ensure the Webpack runtime is updated before executing client-side JS of the new page.
if (process.env.NODE_ENV !== 'production' && !process.env.TURBOPACK) {
await require('../../dev/hot-reloader/app/hot-reloader-app').waitForWebpackRuntimeHotUpdate();
}
// Handle the `fetch` readable stream that can be unwrapped by `React.use`.
const flightStream = postponed ? createUnclosingPrefetchStream(res.body) : res.body;
const response = await createFromNextReadableStream(flightStream);
if ((0, _appbuildid.getAppBuildId)() !== response.b) {
return doMpaNavigation(res.url);
}
return {
flightData: (0, _flightdatahelpers.normalizeFlightData)(response.f),
canonicalUrl: canonicalUrl,
couldBeIntercepted: interception,
prerendered: response.S,
postponed,
staleTime
};
} catch (err) {
if (!abortController.signal.aborted) {
console.error("Failed to fetch RSC payload for " + url + ". Falling back to browser navigation.", err);
}
// If fetch fails handle it like a mpa navigation
// TODO-APP: Add a test for the case where a CORS request fails, e.g. external url redirect coming from the response.
// See https://github.com/vercel/next.js/issues/43605#issuecomment-1451617521 for a reproduction.
return {
flightData: url.toString(),
canonicalUrl: undefined,
couldBeIntercepted: false,
prerendered: false,
postponed: false,
staleTime: -1
};
}
}
async function createFetch(url, headers, fetchPriority, signal) {
// TODO: In output: "export" mode, the headers do nothing. Omit them (and the
// cache busting search param) from the request so they're
// maximally cacheable.
if (process.env.__NEXT_TEST_MODE && fetchPriority !== null) {
headers['Next-Test-Fetch-Priority'] = fetchPriority;
}
if (process.env.NEXT_DEPLOYMENT_ID) {
headers['x-deployment-id'] = process.env.NEXT_DEPLOYMENT_ID;
}
const fetchOptions = {
// Backwards compat for older browsers. `same-origin` is the default in modern browsers.
credentials: 'same-origin',
headers,
priority: fetchPriority || undefined,
signal
};
// `fetchUrl` is slightly different from `url` because we add a cache-busting
// search param to it. This should not leak outside of this function, so we
// track them separately.
let fetchUrl = new URL(url);
(0, _setcachebustingsearchparam.setCacheBustingSearchParam)(fetchUrl, headers);
let browserResponse = await fetch(fetchUrl, fetchOptions);
// If the server responds with a redirect (e.g. 307), and the redirected
// location does not contain the cache busting search param set in the
// original request, the response is likely invalid — when following the
// redirect, the browser forwards the request headers, but since the cache
// busting search param is missing, the server will reject the request due to
// a mismatch.
//
// Ideally, we would be able to intercept the redirect response and perform it
// manually, instead of letting the browser automatically follow it, but this
// is not allowed by the fetch API.
//
// So instead, we must "replay" the redirect by fetching the new location
// again, but this time we'll append the cache busting search param to prevent
// a mismatch.
//
// TODO: We can optimize Next.js's built-in middleware APIs by returning a
// custom status code, to prevent the browser from automatically following it.
//
// This does not affect Server Action-based redirects; those are encoded
// differently, as part of the Flight body. It only affects redirects that
// occur in a middleware or a third-party proxy.
let redirected = browserResponse.redirected;
if (process.env.__NEXT_CLIENT_VALIDATE_RSC_REQUEST_HEADERS) {
// This is to prevent a redirect loop. Same limit used by Chrome.
const MAX_REDIRECTS = 20;
for(let n = 0; n < MAX_REDIRECTS; n++){
if (!browserResponse.redirected) {
break;
}
const responseUrl = new URL(browserResponse.url, fetchUrl);
if (responseUrl.origin !== fetchUrl.origin) {
break;
}
if (responseUrl.searchParams.get(_approuterheaders.NEXT_RSC_UNION_QUERY) === fetchUrl.searchParams.get(_approuterheaders.NEXT_RSC_UNION_QUERY)) {
break;
}
// The RSC request was redirected. Assume the response is invalid.
//
// Append the cache busting search param to the redirected URL and
// fetch again.
fetchUrl = new URL(responseUrl);
(0, _setcachebustingsearchparam.setCacheBustingSearchParam)(fetchUrl, headers);
browserResponse = await fetch(fetchUrl, fetchOptions);
// We just performed a manual redirect, so this is now true.
redirected = true;
}
}
// Remove the cache busting search param from the response URL, to prevent it
// from leaking outside of this function.
const responseUrl = new URL(browserResponse.url, fetchUrl);
responseUrl.searchParams.delete(_approuterheaders.NEXT_RSC_UNION_QUERY);
const rscResponse = {
url: responseUrl.href,
// This is true if any redirects occurred, either automatically by the
// browser, or manually by us. So it's different from
// `browserResponse.redirected`, which only tells us whether the browser
// followed a redirect, and only for the last response in the chain.
redirected,
// These can be copied from the last browser response we received. We
// intentionally only expose the subset of fields that are actually used
// elsewhere in the codebase.
ok: browserResponse.ok,
headers: browserResponse.headers,
body: browserResponse.body,
status: browserResponse.status
};
return rscResponse;
}
function createFromNextReadableStream(flightStream) {
return createFromReadableStream(flightStream, {
callServer: _appcallserver.callServer,
findSourceMapURL: _appfindsourcemapurl.findSourceMapURL
});
}
function createUnclosingPrefetchStream(originalFlightStream) {
// When PPR is enabled, prefetch streams may contain references that never
// resolve, because that's how we encode dynamic data access. In the decoded
// object returned by the Flight client, these are reified into hanging
// promises that suspend during render, which is effectively what we want.
// The UI resolves when it switches to the dynamic data stream
// (via useDeferredValue(dynamic, static)).
//
// However, the Flight implementation currently errors if the server closes
// the response before all the references are resolved. As a cheat to work
// around this, we wrap the original stream in a new stream that never closes,
// and therefore doesn't error.
const reader = originalFlightStream.getReader();
return new ReadableStream({
async pull (controller) {
while(true){
const { done, value } = await reader.read();
if (!done) {
// Pass to the target stream and keep consuming the Flight response
// from the server.
controller.enqueue(value);
continue;
}
// The server stream has closed. Exit, but intentionally do not close
// the target stream.
return;
}
}
});
}
if ((typeof exports.default === 'function' || (typeof exports.default === 'object' && exports.default !== null)) && typeof exports.default.__esModule === 'undefined') {
Object.defineProperty(exports.default, '__esModule', { value: true });
Object.assign(exports.default, exports);
module.exports = exports.default;
}
//# sourceMappingURL=fetch-server-response.js.map