Issue with "Missing Authentication Token" Error When Invoking API Gateway from ECS Fargate

To retrieve and use the ECS task role credentials in a Node.js application to invoke an API Gateway, you can follow these steps:

1. Configure Task Role: First, you need to configure a task role for your ECS task. This task role should have the necessary permissions to call the API Gateway. You can create an IAM policy with the required actions and attach it to the task role. Also, make sure the API GW is using the righ method and with the correct Authorization.

2. Install Dependencies: In your Node.js application, you'll need to install the aws-sdk package from npm. This package provides an interface to interact with various AWS services, including retrieving credentials from the ECS task metadata.

npm install aws-sdk

3. Retrieve Credentials: In your Node.js code, you can use the aws-sdk to retrieve the task role credentials from the ECS metadata service. Here's an example (please, test in your dev env before run it in production):

const AWS = require('aws-sdk');

// Create a new ECS metadata service object
const metadataService = new AWS.ECSMetadataService();

// Get the task role credentials
metadataService.getCredentialsForTask((err, credentials) => {
  if (err) {
    console.error('Error retrieving credentials:', err);
    return;
  }

  // Configure the AWS SDK with the retrieved credentials
  AWS.config.update({
    credentials: credentials
  });

  // Use the configured AWS SDK to call the API Gateway
  const apiGateway = new AWS.APIGateway();
  // ... (call the API Gateway methods)
});

4. Call API Gateway: After configuring the AWS SDK with the retrieved task role credentials, you can use the AWS.APIGateway service object to interact with the API Gateway. For example, you can call the invokeApi method to send a request to your API Gateway endpoint.

const apiGatewayParams = {
  // Set the necessary parameters for invokeApi
  // e.g., httpMethod, resourcePath, pathWithQueryString, etc.
};

apiGateway.invokeApi(apiGatewayParams, (err, data) => {
  if (err) {
    console.error('Error invoking API Gateway:', err);
    return;
  }

  // Handle the API Gateway response
  console.log('API Gateway response:', data);
});

Note that the ECS metadata service is only available inside the ECS task's container. If you're running your Node.js application outside of an ECS task, you'll need to use other methods to retrieve and configure AWS credentials, such as environment variables or an AWS credentials file.

Hope this helps!