module: add application/json in accept header when fetching json module

lib/internal/modules/esm/fetch_module.js

@@ -138,15 +138,16 @@ function isRedirect(statusCode) {
  * @param {URL} parsed
  * @returns {Promise<CacheEntry> | CacheEntry}
  */
-function fetchWithRedirects(parsed) {
+function fetchWithRedirects(parsed, context) {
   const existing = cacheForGET.get(parsed.href);
   if (existing) {
     return existing;
   }
   const handler = parsed.protocol === 'http:' ? HTTPGet : HTTPSGet;
   const result = (async () => {
+    const extension = context.importAssertions?.type;
     const req = handler(parsed, {
-      headers: { Accept: '*/*' },
+      headers: { Accept: extension === 'json' ? 'application/json,*/*;' : '*/*;' },
     });
     // Note that `once` is used here to handle `error` and that it hits the
     // `finally` on network error/timeout.
@@ -162,7 +163,7 @@ function fetchWithRedirects(parsed) {
             'cannot redirect to non-network location',
           );
         }
-        const entry = await fetchWithRedirects(location);
+        const entry = await fetchWithRedirects(location, context);
         cacheForGET.set(parsed.href, entry);
         return entry;
       }
@@ -262,7 +263,8 @@ async function isLocalAddress(hostname) {
  * @param {ESModuleContext} context
  * @returns {ReturnType<typeof fetchWithRedirects>}
  */
-function fetchModule(parsed, { parentURL }) {
+function fetchModule(parsed, context) {
+  const { parentURL } = context;
   const { href } = parsed;
   const existing = cacheForGET.get(href);
   if (existing) {
@@ -277,10 +279,10 @@ function fetchModule(parsed, { parentURL }) {
           'http can only be used to load local resources (use https instead).',
         );
       }
-      return fetchWithRedirects(parsed);
+      return fetchWithRedirects(parsed, context);
     });
   }
-  return fetchWithRedirects(parsed);
+  return fetchWithRedirects(parsed, context);
 }
 
 module.exports = {