CreateSpeechAsync doesn't work on WebGL builds

[foundway]

Bug Report

Overview

openAI.AudioEndpoint.CreateSpeechAsync throw the following error:

63fc5e1f-3537-4cd6-b727-3c7cc79dd4f7:10 System.IO.DirectoryNotFoundException: Could not find a part of the path "/tmp/download_cache/Nova-20231130T120608.mp3".
  at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00000] in <00000000000000000000000000000000>:0 
--- End of stack trace from previous location where exception was thrown ---

Likely due to some limitation of WebGL

To Reproduce

Steps to reproduce the behavior:
Call CreateSpeechAsync using something similar to the sample code in README

        try
        {
            var request = new SpeechRequest(text, Model.TTS_1, voice: SpeechVoice.Nova);
            Debug.Log("Asking TTS_1...");
            openAI.AudioEndpoint.EnableDebug = true;
            var (clipPath, clip) = await openAI.AudioEndpoint.CreateSpeechAsync(request, lifetimeCancellationTokenSource.Token);
            audioSource.clip = clip;
            audioSource.Play();
        }
        catch (Exception e)
        {
            Debug.LogError(e);
        }

Expected behavior

I should get an audioClip and its path in return as worked in editor and other platforms

Screenshots

Additional context

[StephenHodgson]

Are you running this in local host?

[StephenHodgson]

Due to CORS policy of local storage in local WebGL builds you will get the generated clip however it will not be downloaded using UnityWebRequest until you run it out of localhost, on a server.

[foundway]

I am hosting on GitHub Page:
https://foundway.github.io/WhisperWebGL/TTS/

[StephenHodgson]

Okay, likely related to RageAgainstThePixel/com.utilities.rest#51

[StephenHodgson]

Duplicate of #130