Using google speech API in C# returns 403 error

Question

Trying to use Google Speech API in C# returns 403.

In Google Cloud Platform I generated a key and still getting the 403 error.

Used this code:

class Program
 {
    static void Main(string[] args)
    {
        try
        {

            FileStream fileStream = File.OpenRead("good-morning-google.flac");
            MemoryStream memoryStream = new MemoryStream();
            memoryStream.SetLength(fileStream.Length);
            fileStream.Read(memoryStream.GetBuffer(), 0, (int)fileStream.Length);
            byte[] BA_AudioFile = memoryStream.GetBuffer();
            HttpWebRequest _HWR_SpeechToText = null;
            _HWR_SpeechToText =
                        (HttpWebRequest)HttpWebRequest.Create(
                            "https://www.google.com/speech-api/v2/recognize?output=json&lang=en-us&key=YOUR_API_KEY_HERE");
            _HWR_SpeechToText.Credentials = CredentialCache.DefaultCredentials;
            _HWR_SpeechToText.Method = "POST";
            _HWR_SpeechToText.ContentType = "audio/x-flac; rate=44100";
            _HWR_SpeechToText.ContentLength = BA_AudioFile.Length;
            Stream stream = _HWR_SpeechToText.GetRequestStream();
            stream.Write(BA_AudioFile, 0, BA_AudioFile.Length);
            stream.Close();

            HttpWebResponse HWR_Response = (HttpWebResponse)_HWR_SpeechToText.GetResponse();
            if (HWR_Response.StatusCode == HttpStatusCode.OK)
            {
                StreamReader SR_Response = new StreamReader(HWR_Response.GetResponseStream());
                Console.WriteLine(SR_Response.ReadToEnd());
            }

        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }

        Console.ReadLine();
    }
}

It's probably some invalid key issue,tried generating server key and browser key, same result, 403 (forbidden)

please help.

Have you tried using the client library instead of making the call directly with `HttpWebRequest`? (Just trying to find the right version - https://www.nuget.org/packages/Google.Apis.CloudSpeechAPI.v1beta1/ is for v1beta1... it may be that we're looking at different APIs.) — Jon Skeet, Aug 25 '16 at 07:59
@JonSkeet, do you have a working example using Google.Apis.CloudSpeechAPI.v1beta1 ? or even a some example for using this library? I want to use a key and not oauth2 — Alex Choroshin, Aug 25 '16 at 08:16
I would be surprised if it supported just an API key, to be honest. I think you'll have to go the oauth2 route, but that can be pretty painless these days - download a service account key, and you can get credentials fairly easily. See https://developers.google.com/identity/protocols/application-default-credentials I don't have an example for speech at the moment, but I'm going to be working on the gRPC client very soon. (You can already build it from https://github.com/GoogleCloudPlatform/google-cloud-dotnet/tree/master/apis/Google.Cloud.Speech.V1, but I haven't looked at it personally yet.) — Jon Skeet, Aug 25 '16 at 08:23
As you are doing a web request I would try the __curl command__ first from https://cloud.google.com/speech/docs/getting-started or check https://cloud.google.com/speech/reference/rest/ or even https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/speech. I managed to get curl, java and ios examples to work. — Clemens Tolboom, Sep 01 '16 at 11:53
@AlexChoroshin did you find the answer i am facing the same problem — Muhammad Faizan Khan, Oct 26 '16 at 09:17

score 1 · Answer 1 · answered Jul 21 '17 at 16:05

1

This doesn't seem to work anymore. The speech API doesn't show up.

answered Jul 21 '17 at 16:05

JMA

1,781
9
18

score 0 · Answer 2 · answered Sep 07 '16 at 06:57

I haven't tried using the http API but here's my working code using the Google Speech API Library (Google.Apis.CloudSpeechAPI.v1beta1):

void Main()
{
    //create the service and auth
    CloudSpeechAPIService service = new CloudSpeechAPIService(new BaseClientService.Initializer
    {
        ApplicationName = "Speech API Test",
        ApiKey = "your API key..."
    });

    //configure the audio file properties
    RecognitionConfig sConfig = new RecognitionConfig();
    sConfig.Encoding = "FLAC";
    sConfig.SampleRate = 16000;
    sConfig.LanguageCode = "en-AU";

    //make the request and output the transcribed text to console
    SyncRecognizeResponse response = getResponse(service, sConfig, "audio file.flac");
    string resultText = response.Results.ElementAt(0).Alternatives.ElementAt(0).Transcript;
    Console.WriteLine(resultText);
}


public SyncRecognizeResponse getResponse(CloudSpeechAPIService sService, RecognitionConfig sConfig, string fileName)
{
    //read the audio file into a base 64 string and add to API object
    RecognitionAudio sAudio = new RecognitionAudio();
    byte[] audioBytes = getAudioStreamBytes(fileName);
    sAudio.Content = Convert.ToBase64String(audioBytes);

    //create the request with the config and audio files
    SyncRecognizeRequest sRequest = new SyncRecognizeRequest();
    sRequest.Config = sConfig;
    sRequest.Audio = sAudio;

    //execute the request
    SyncRecognizeResponse response = sService.Speech.Syncrecognize(sRequest).Execute();

    return response;
}


public byte[] getAudioStreamBytes(string fileName)
{
    FileStream fileStream = File.OpenRead(fileName);
    MemoryStream memoryStream = new MemoryStream();
    memoryStream.SetLength(fileStream.Length);
    fileStream.Read(memoryStream.GetBuffer(), 0, (int)fileStream.Length);
    byte[] BA_AudioFile = memoryStream.GetBuffer();
    return BA_AudioFile;
}

score 0 · Answer 3 · answered Jan 03 '17 at 06:28

Was getting the same 403 error and below is what helped me to fix

Step 1 - Used quick start speech API documentation - https://cloud.google.com/speech/docs/getting-started and found billing was disabled. Below is the detailed error message that I have received as curl output i.e. 3rd step in the document

{
  "error": {
    "code": 403,
    "message": "Project xxxxx (#xxxxxx) has billing disabled. Please enable it.",
    "status": "PERMISSION_DENIED",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.Help",
        "links": [
          {
            "description": "Google developer console API key",
            "url": "https://console.developers.google.com/project/1026744225026/apiui/credential"
          }
        ]
      }
    ]
  }
}

Enabled billing for the project.

Step 2 - Make sure you are a member of chromium-dev@chromium.org i.e. step 1 as per http://www.chromium.org/developers/how-tos/api-keys (Also refer https://github.com/gillesdemey/google-speech-v2/issues/8)

Once you are member Go to your Project - > click Enable API -> Search for speech API it will have 2 results - > Enable 'Speech API Private API' (before subscribing to group you would only see 'Google Cloud Speech API' now you can see 'Speech API Private API')

Hope this helps

Using google speech API in C# returns 403 error

3 Answers3