UnityWebRequest does not complete [duplicate] - unity3d

Question

I'm trying to use a cloud TTS within my Unity game.
With the newer versions (I am using 2019.1), they have deprecated WWW in favour of UnityWebRequest(s) within the API.
I have tried the Unity Documentation, but that didn't work for me.
I have also tried other threads and they use WWW which is deprecated for my Unity version.
void Start()
{
StartCoroutine(PlayTTS());
}
IEnumerator PlayTTS()
{
using (UnityWebRequestMultimedia wr = new UnityWebRequestMultimedia.GetAudioClip(
"https://example.com/tts?text=Sample%20Text&voice=Male",
AudioType.OGGVORBIS)
)
{
yield return wr.Send();
if (wr.isNetworkError)
{
Debug.LogWarning(wr.error);
}
else
{
//AudioClip ttsClip = DownloadHandlerAudioClip.GetContent(wr);
}
}
}
The URL in a browser (I used Firefox) successfully loaded the audio clip allowing me to play it.
What I want it to do is play the TTS when something happens in the game, it has been done within the "void Start" for testing purposes.
Where am I going wrong?
Thanks in advance
Josh

Answer 1

UnityWebRequestMultimedia.GetAudioClip automatically adds a default DownloadHandlerAudioClip which has a property streamAudio.
Set this to true and add a check for UnityWebRequest.downloadedBytes in order to delay the playback before starting.
Something like
public AudioSource source;
IEnumerator PlayTTS()
{
using (var wr = new UnityWebRequestMultimedia.GetAudioClip(
"https://example.com/tts?text=Sample%20Text&voice=Male",
AudioType.OGGVORBIS)
)
{
((DownloadHandlerAudioClip)wr.downloadHandler).streamAudio = true;
wr.Send();
while(!wr.isNetworkError && wr.downloadedBytes <= someThreshold)
{
yield return null;
}
if (wr.isNetworkError)
{
Debug.LogWarning(wr.error);
}
else
{
// Here I'm not sure if you would use
source.PlayOneShot(DownloadHandlerAudioClip.GetContent(wr));
// or rather
source.PlayOneShot((DownloadHandlerAudioClip)wr.downloadHandler).audioClip);
}
}
}
Typed on smartphone so no warranty but I hope you get the idea