Sending an HTTP POST request with JSON body

Question

I am trying to get the Google Cloud Speech API to work in my Unity game. Unfortunately, I cannot install the Google Speech API into a script for my project as it is dependent on .NET 4.5 whereas Unity is using .NET 3.5 (and yes there is an experimental .NET 4.6 for Unity and I have used it with no success).

Therefore, I have resorted to having to send a POST HTTP request. I have successfully done so through the Google Cloud Shell, however, I need to somehow use Visual Studio to send the request with C#. I have looked at similar threads but haven't had much luck. I have installed RestSharp but have not found the documentation sufficient.

I need to:

 POST https://speech.googleapis.com/v1/speech:recognize

with the following JSON body:

 {
   "config": {
       "encoding":"FLAC",
       "sample_rate": 16000,
       "language_code": "en-US"
   },
   "audio": {
       "uri":"gs://cloud-samples-tests/speech/brooklyn.flac"
   }
 }

I have tried for hours to get this seamingly simple task to work in Visual Studio so I can import it into the Unity Engine. How can I do this with JSON parameters?

Thanks

Answer 1

Answer by RMGK · Mar 13, 2019 at 11:49 PM

This is a tough one. The way I got around it was using a custom Uploader using UnityWebRequest. Something like below:

         UnityWebRequest webRequest = new UnityWebRequest(<URL>, "POST");
         byte[] encodedPayload = new System.Text.UTF8Encoding().GetBytes(<JSON PAYLOAD STRING>);
         webRequest.uploadHandler = (UploadHandler) new UploadHandlerRaw(encodedPayload);
         webRequest.downloadHandler = (DownloadHandler) new DownloadHandlerBuffer();
         webRequest.SetRequestHeader("Content-Type", "application/json");
         webRequest.SetRequestHeader("cache-control", "no-cache");
         
         UnityWebRequestAsyncOperation requestHandel = webRequest.SendWebRequest();
         requestHandel.completed += delegate(AsyncOperation pOperation) {
             Debug.Log(webRequest.responseCode);
             Debug.Log(webRequest.downloadHandler.text);
         };

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