Implement HTTP/1.1 Persistent Connections (Keep-Alive)

Write a C program that documents HTTP/1.1 persistent connections. Show a request/response sequence on the same socket, Content-Length parsing, and connection management.

Requirements:

• Create a TCP client socket and connect to a server (or simulate with printf)
• Send an HTTP/1.1 GET request including the Connection: keep-alive header
• Print the sent request showing the keep-alive header
• Simulate or receive an HTTP/1.1 200 OK response with Content-Length
• Parse the Content-Length value from the response headers
• Print a message showing that the connection remains open
• Send a second request on the same socket
• Show the server responding with Connection: close
• Print a message indicating the connection is being closed
• Document each step with clear printf statements