Problem this snippet solves:

This iRule logs a line for the following events:

when a new TCP connection is established with a client
when the HTTP headers of an HTTP request are received from the client
when the HTTP headers of an HTTP response are received from the pool member
when the TCP connection with a client is closed

Code :

# Here is a sample of the log output for a single TCP connection with three HTTP requests:

: New TCP connection from 192.168.99.210:2675 to 192.168.101.41:80

:    Client 192.168.99.210:2675 -> test_http_vip/test0.html?parameter=val (request)
:   Client 192.168.99.210:2675 -> test_http_vip/test0.html?parameter=val (response) - pool info http_pool 192.168.101.45 80  - status: 200 (request/response delta: 0ms)

:    Client 192.168.99.210:2675 -> test_http_vip/test1.html?parameter=val (request)
:   Client 192.168.99.210:2675 -> test_http_vip/test1.html?parameter=val (response) - pool info http_pool 192.168.101.45 80  - status: 200 (request/response delta: 0ms)

:    Client 192.168.99.210:2675 -> test_http_vip/test2.html?parameter=val (request)
:   Client 192.168.99.210:2675 -> test_http_vip/test2.html?parameter=val (response) - pool info http_pool 192.168.101.45 80  - status: 200 (request/response delta: 1ms)

:   Closed TCP connection from 192.168.99.210:2675 to 192.168.101.41:80 (open for: 1078ms)

when CLIENT_ACCEPTED {
# Get time for start of TCP connection in milleseconds
set tcp_start_time [clock clicks -milliseconds]

# Log the start of a new TCP connection
log local0. "New TCP connection from [IP::client_addr]:[TCP::client_port] to [IP::local_addr]:[TCP::local_port]"
}
when HTTP_REQUEST {
# Get time for start of HTTP request
set http_request_time [clock clicks -milliseconds]

# Log the start of a new HTTP request
set LogString "Client [IP::client_addr]:[TCP::client_port] -> [HTTP::host][HTTP::uri]"
log local0. "$LogString (request)"
}

when LB_SELECTED {
log local0. "Client [IP::client_addr]:[TCP::client_port]: Selected [LB::server]"
}
when LB_FAILED {
log local0. "Client [IP::client_addr]:[TCP::client_port]: Failed to [LB::server]"
}
when SERVER_CONNECTED {
log local0. "Client [IP::client_addr]:[TCP::client_port]: Connected to [IP::server_addr]:[TCP::server_port]"
}
when HTTP_RESPONSE {
# Received the response headers from the server.  Log the pool name, IP and port, status and time delta
log local0. "$LogString (response) - pool info: [LB::server] - status: [HTTP::status] (request/response delta: [expr {[clock clicks -milliseconds] - $http_request_time}] ms)"
}
when CLIENT_CLOSED {
# Log the end time of the TCP connection
log local0. "Closed TCP connection from [IP::client_addr]:[TCP::client_port] to [IP::local_addr]:[TCP::local_port] (open for: [expr {[clock clicks -milliseconds] - $tcp_start_time}] ms)"
}

Log Tcp And Http Request Response Info