[Monitoring, Reporting, and Automation] A company hosts an internet web application on Amazon EC2 instances. The company is replacing the application…

To route traffic based on the URL path during a transition period where both an EC2-based legacy

application and a new AWS Lambda function are in use:

Use of Application Load Balancer (ALB): ALBs support advanced request routing based on the URL

path, among other criteria. This capability allows the ALB to evaluate the URL path of incoming

requests and route them appropriately to either the legacy EC2 instances or the Lambda function.

Path-Based Routing Rules: Configure the ALB with rules that specify which URL paths should be

directed to the EC2 instances and which should be routed to the Lambda function. For example,

requests to /legacy/* might go to the EC2 instances, while /new/* could be directed to the Lambda

function.

Integration with Lambda: ALBs can directly invoke Lambda functions in response to HTTP requests,

making them ideal for scenarios where both server-based and serverless components are used in

tandem.

This setup not only facilitates a smooth transition by enabling simultaneous operation of both

components but also leverages the native capabilities of ALBs to manage traffic based on application

requirements effectively.