revert: store header keys lower case internally (#12837)

This reverts commit 49ec3d10ad90851f4d28274a3f0fe96c642204ac.

1 files changed, 5 insertions, 4 deletions

diff --git a/ext/fetch/26_fetch.js b/ext/fetch/26_fetch.js
index f15e7f6b9..47d8b2e85 100644
--- a/ext/fetch/26_fetch.js
+++ b/ext/fetch/26_fetch.js
@@ -14,6 +14,7 @@
 ((window) => {
   const core = window.Deno.core;
   const webidl = window.__bootstrap.webidl;
+  const { byteLowerCase } = window.__bootstrap.infra;
   const { errorReadableStream } = window.__bootstrap.streams;
   const { InnerBody, extractBody } = window.__bootstrap.fetchBody;
   const {
@@ -331,7 +332,7 @@
   function httpRedirectFetch(request, response, terminator) {
     const locationHeaders = ArrayPrototypeFilter(
       response.headerList,
-      (entry) => entry[0] === "location",
+      (entry) => byteLowerCase(entry[0]) === "location",
     );
     if (locationHeaders.length === 0) {
       return response;
@@ -372,7 +373,7 @@
         if (
           ArrayPrototypeIncludes(
             REQUEST_BODY_HEADER_NAMES,
-            request.headerList[i][0],
+            byteLowerCase(request.headerList[i][0]),
           )
         ) {
           ArrayPrototypeSplice(request.headerList, i, 1);
@@ -418,8 +419,8 @@
       }
       requestObject.signal[abortSignal.add](onabort);
 
-      if (!requestObject.headers.has("accept")) {
-        ArrayPrototypePush(request.headerList, ["accept", "*/*"]);
+      if (!requestObject.headers.has("Accept")) {
+        ArrayPrototypePush(request.headerList, ["Accept", "*/*"]);
       }
 
       // 12.