How use BIG-IP to capture HTTP request and response

HI you can use irule example

code    
when HTTP_REQUEST {
    set REQUEST_RECEIVE [clock clicks -milliseconds]
    set uri [HTTP::uri]
    set clientip [IP::client_addr]
    set clientport [TCP::client_port]
}
when HTTP_RESPONSE {   
    set RESPONSE_RECEIVE [expr {[clock clicks -milliseconds] - $REQUEST_RECEIVE}]
    log local0. "Server response took longer than ms: $RESPONSE_RECEIVE . TCP connection from [IP::client_addr]:[TCP::client_port] to [LB::server addr]:[LB::server port].Requested URI is ${uri}"
}