Steps to reproduce:
1. Open the attached user's project "UnityWebRequest2021.zip"
2. Open "SampleScene.unity"
3. Enter Play Mode
4. Observe the Response time in the Console Log as well as the time shown in the Game View

Expected results: UnityWebRequest response time is ~2 seconds
Actual results: UnityWebRequest response time is ~20 seconds

Reproducible with: 2021.3.29f1, 2021.3.31f1, 2022.3.11f1, 2023.1.15f1, 2023.2.0b14, 2023.3.0a10
Not reproducible on 2021.3.28f1

Reproducible on: Windows 10, Windows 11
Not reproducible on: No other environment tested

Notes:
-On 2023.3.0a10 the project crashes after around 10 seconds with this output:
0x00007FFE20C4608D (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\mini\mini-runtime.c:3259] mono_jit_runtime_invoke
0x00007FFE20B88464 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\object.c:3066] do_runtime_invoke
0x00007FFE20B88550 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\object.c:3113] mono_runtime_invoke
Asset Pipeline Refresh (id=968e5996a5bd5bb43b6c439634df476e): Total: 0.007 seconds - Initiated by RefreshV2(NoUpdateAssetOptions)
0x00007FFD945E5F04 (Unity) scripting_method_invoke
0x00007FFD945BF8B3 (Unity) ScriptingInvocation::Invoke
0x00007FFD945BAA57 (Unity) ScriptingInvocation::Invoke<core::basic_string<char,core::StringStorageDefault<char> > >
0x00007FFD94721092 (Unity) Scripting::UnityEngineInternal::WebRequestUtilsProxy::RedirectTo
0x00007FFD94CA5CE8 (Unity) RedirectHelper::RedirectTo
0x00007FFD94CA02E1 (Unity) UnityWebRequestProto<UnityWebRequestTransport,AtomicRefCounter,RedirectHelper,ResponseHelper,DownloadHandler,UploadHandler,CertificateHandler,HeaderHelper,AsyncOperation>::Job_RedirectTo_BackgroundThread
0x00007FFD941EA75D (Unity) ujob_execute_job
0x00007FFD941E9DF8 (Unity) lane_guts
0x00007FFD941EC7F4 (Unity) worker_thread_routine
0x00007FFD943A8205 (Unity) Thread::RunThreadWrapper
0x00007FFE738B7344 (KERNEL32) BaseThreadInitThunk
0x00007FFE748026B1 (ntdll) RtlUserThreadStart