Single Fetch: proxy request signal through on interrupted loader calls (Remix PR 9738)

Author: brophdawg11

packages/react-router/lib/dom/ssr/single-fetch.tsx

@@ -182,12 +182,13 @@ function singleFetchLoaderStrategy(
       m.resolve(async (handler): Promise<HandlerResult> => {
         let result: unknown;
         let url = stripIndexParam(singleFetchUrl(request.url));
+        let init = await createRequestInit(request);
 
         // When a route has a client loader, it calls it's singular server loader
         if (manifest.routes[m.route.id].hasClientLoader) {
           result = await handler(async () => {
             url.searchParams.set("_routes", m.route.id);
-            let { data } = await fetchAndDecode(url);
+            let { data } = await fetchAndDecode(url, init);
             return unwrapSingleFetchResults(
               data as SingleFetchResults,
               m.route.id
@@ -204,7 +205,7 @@ function singleFetchLoaderStrategy(
                 matches.filter((m) => m.shouldLoad).map((m) => m.route),
                 url
               );
-              singleFetchPromise = fetchAndDecode(url).then(
+              singleFetchPromise = fetchAndDecode(url, init).then(
                 ({ data }) => data as SingleFetchResults
               );
             }
@@ -304,7 +305,7 @@ export function singleFetchUrl(reqUrl: URL | string) {
   return url;
 }
 
-async function fetchAndDecode(url: URL, init?: RequestInit) {
+async function fetchAndDecode(url: URL, init: RequestInit) {
   let res = await fetch(url, init);
   invariant(res.body, "No response body to decode");
   try {