iRule to remove Headers which have whitespaces

This irule uses TCP::collect and TCP::payload to change the header names to ones without a space so they can be deleted:

when HTTP_RESPONSE {
  HTTP::header remove "process_name"
  HTTP::header remove "process_type"
  HTTP::header remove "pragma"
}
 
when SERVER_CONNECTED {
 TCP::collect
}
 
when SERVER_DATA {
 log local0. "in SERVER_DATA [TCP::payload]"
 
 set header_1 [regexp -all -inline -indices {process name} [TCP::payload]]
 set header_1_start [lindex [lindex $header_1 0] 0]
 set header_1_end [lindex [lindex $header_1 0] 1]
 set header_1_length [expr ($header_1_end - $header_1_start) + 1]
 log local0. "process name occurs at byte $header_1_start, length $header_1_length"
 TCP::payload replace $header_1_start $header_1_length {process_name}
 
 set header_2 [regexp -all -inline -indices {process type} [TCP::payload]]
 set header_2_start [lindex [lindex $header_2 0] 0]
 set header_2_end [lindex [lindex $header_2 0] 1]
 set header_2_length [expr ($header_2_end - $header_2_start) + 1]
 log local0. "process type occurs at byte $header_2_start, length $header_2_length"
 TCP::payload replace $header_2_start $header_2_length {process_type}
 
 TCP::release
}

It could be written in a more efficient way, but this hopefully makes it clear at each step what is happening. You should also only collect enough SERVER_DATA to get the headers that you want to manipulate, rather than collecting the entire TCP response which could be expensive on memory.