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I am trying to use Amazon Transcribe Streaming Service with a http2 request from Node.js, Here is the documentation links that I am following
Streaming request format. According to this document end point is https://transcribe-streaming.<'region'>.amazonaws.com, but making a request to this url gives url not found error.
But in the Java Example found end point as https://transcribestreaming.''.amazonaws.com, so making a request to this url does not give any error or response back. I am trying from us-east-1 region.

Here is the code I am trying with.

const http2 = require('http2');
var aws4 = require('aws4');

var opts = 
 service: 'transcribe', 
 region: 'us-east-1', 
 path: '/stream-transcription', 
 headers:
 'content-type': 'application/json',
 'x-amz-target': 'com.amazonaws.transcribe.Transcribe.StartStreamTranscription'
 


var urlObj = aws4.sign(opts, accessKeyId: '<access key>', secretAccessKey: '<aws secret>');

client.on('error', function(err)
 console.error("error in request ",err);
);

const req = client.request(
 ':method': 'POST',
 ':path': '/stream-transcription',
 'authorization': urlObj.headers.Authorization, 
 'content-type': 'application/json',
 'x-amz-content-sha256': 'STREAMING-AWS4-HMAC-SHA256-EVENTS',
 'x-amz-target': 'com.amazonaws.transcribe.Transcribe.StartStreamTranscription',
 'x-amz-date': urlObj['headers']['X-Amz-Date'],
 'x-amz-transcribe-language-code': 'en-US',
 'x-amz-transcribe-media-encoding': 'pcm',
 'x-amz-transcribe-sample-rate': 44100
);

req.on('response', (headers, flags) => 
 for (const name in headers) 
 console.log(`$name: $headers[name]`);
 
);
let data = '';
req.on('data', (chunk) => data += chunk; );
req.on('end', () => 
 console.log(`n$data`);
 client.close();
);
req.end();

Can anyone point out what I am missing here. I couldn't find any examples implementing this with HTTP/2 either.

Update:
Changing the Content-type to application/json came back with response status 200 but with following exception:

`"Output":"__type":"com.amazon.coral.service#SerializationException","Version":"1.0"`