Can't work AI Gateway with bedrock about cloudflare-docs HOT 4 OPEN

import { AwsClient } from 'aws4fetch'

export default {
	async fetch(request, env, ctx) {

  
	  const requestData = {
		inputText: "What does ethereal mean?"
	  };
  
	  const headers = {
		'Content-Type': 'application/json'
	  };
  
	  // sign the original request
	  const stockUrl = new URL("https://bedrock-runtime.us-east-1.amazonaws.com/model/amazon.titan-embed-text-v1/invoke")
  
	  const awsClient = new AwsClient({
		accessKeyId: accessKey,
		secretAccessKey: secretKey,
		region: region,
		service: "bedrock"
	  });
  
	  const presignedRequest = await awsClient.sign(stockUrl.toString(), {
		method: "POST",
		headers: headers
	  });

	  console.log(presignedRequest);
  
	  // change the signed request's host to AI Gateway
	  const stockUrlSigned = new URL(presignedRequest.url);
	  stockUrlSigned.host = "gateway.ai.cloudflare.com"
	  stockUrlSigned.pathname = `/v1/${cfAccountId}/${gatewayName}/aws-bedrock/bedrock-runtime/${region}/model/amazon.titan-embed-text-v1/invoke`
  
	  // make request
	  const response = await fetch(stockUrlSigned, {
		method: 'POST',
		headers: presignedRequest.headers,
		body: JSON.stringify(requestData)
	  })
  
	  if (response.ok && response.headers.get('content-type')?.includes('application/json')) {
		const data = await response.json();
		return new Response(JSON.stringify(response));
	  } else {
		// Display the data in the console
		const data = await response.text();
		console.log(data);
		return new Response("Invalid response", { status: 500 });
	  }
	},
  };