Specify a regional endpoint

Speech-to-Text offers US and EU regional API endpoints. If you use a regional endpoint, your data at-rest and in-use will stay within the continental boundaries of Europe or the USA. Specifying an endpoint is important if your data's location must be controlled in order to comply with local regulatory requirements. There is no functional change to the behavior of the API.

Use regional endpoints

When you use a regional endpoint, make sure to include the matching us or eu location in the parent string. See the RecognitionConfig documentation for more information about configuring the recognition request body.

Protocol

To perform speech recognition using a regional endpoint, run the applicable command in the table below to configure the correct endpoint:

Multi-region	Endpoint override
EU	$ export CLOUD_SPEECH_ENDPOINT=https://eu-speech.googleapis.com
US	$ export CLOUD_SPEECH_ENDPOINT=https://us-speech.googleapis.com

The following code sample demonstrates how to send a recognize request that keeps all data confined to a specified region. You can substitute either the EU or US regional endpoint for the CLOUD_SPEECH_ENDPOINT variable.

$ curl   -H "Content-Type: application/json"  \
         -H  "Authorization: Bearer "$(gcloud auth print-access-token)   \
          $CLOUD_SPEECH_ENDPOINT/v1/speech:recognize \
         --data "{
        'config': {
            'encoding': 'LINEAR16',
            'languageCode': 'en-US'
        },
        'audio': {
            'uri':'gs://speech-samples-00/commercial_mono.wav'
        }
    }"

This example uses Google Cloud CLI to generate credentials for your user account. To learn how to install and initialize the gcloud CLI, see the quickstart.

The audio content supplied in the request body is base64-encoded. For more information on how to base64-encode audio, see Base64 Encoding Audio Content. For more information on the content field, see RecognitionAudio.

gcloud

The following commands set a regional endpoint:

Multi-region	Endpoint override
EU	gcloud config set api_endpoint_overrides/speech https://eu-speech.googleapis.com/
US	gcloud config set api_endpoint_overrides/speech https://us-speech.googleapis.com/

After you set the regional endpoint, all data will be confined to the specified region when you send subsequent recognize requests. The following example demonstrates a recognize request.

$ gcloud ml speech recognize gs://cloud-samples-tests/speech/brooklyn.flac \
    --language-code=en-US --log-http

Python

To learn how to install and use the client library for Speech-to-Text, see Speech-to-Text client libraries. For more information, see the Speech-to-Text Python API reference documentation.

To authenticate to Speech-to-Text, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

# Imports the Google Cloud client library
from google.api_core import client_options
from google.cloud import speech


def sync_recognize_with_multi_region_gcs() -> speech.RecognizeResponse:
    """Recognizes speech synchronously in the GCS bucket."""

    # Instantiates a client

    # Pass an additional argument, ClientOptions, to specify the new endpoint.
    _client_options = client_options.ClientOptions(
        api_endpoint="eu-speech.googleapis.com"
    )

    client = speech.SpeechClient(client_options=_client_options)

    # The name of the audio file to transcribe
    gcs_uri = "gs://cloud-samples-data/speech/brooklyn_bridge.raw"

    audio = speech.RecognitionAudio(uri=gcs_uri)

    config = speech.RecognitionConfig(
        encoding=speech.RecognitionConfig.AudioEncoding.LINEAR16,
        sample_rate_hertz=16000,
        language_code="en-US",
    )

    # Detects speech in the audio file
    response = client.recognize(config=config, audio=audio)

    for result in response.results:
        print(f"Transcript: {result.alternatives[0].transcript}")

    return response.results

Restrict global API endpoint usage

To help enforce the use of regional endpoints, use the constraints/gcp.restrictEndpointUsage organization policy constraint to block requests to the global API endpoint. For more information, see Restricting endpoint usage.