Description

Refactors the request handler method in the App class to avoid allocating new
function closures (loop and handle) on every incoming HTTP request.

Key Changes

• Extracted loop and handle logic into private helper methods (#loop and
  #handle) on the App class.

Benefits

• Throughput: Decreases function instantiation overhead per request.
• Tail Latency: Reduces GC (Garbage Collection) pressure under high throughput,
  leading to more stable tail latencies (p99/p99.9).