HTTP Protocol Validation

Only accept right FDQN request, otherwise deny or redirect it to portect your real server.
Useful to clean HTTP (port 80) robot scan.
Deny not acceptable HTTP method
Deny incorrect HTTP version

Requirement

Service Type: HTTP / HTTPS

Code

when HTTP_REQUEST {
  # Check method first.
  if { [HTTP::method] == "GET" || [HTTP::method] == "POST" } {
    # do nothing
  } else {
    log local0. "[IP::remote_addr]->[IP::local_addr]:[TCP::local_port] method wrong."
    HTTP::redirect "http://www.au.edu.tw"
  }

  # Check HTTP version.
  if { [HTTP::version] eq "1.0" || [HTTP::version] eq "1.1" } {
    # do nothing
  } else {
    log local0. "[IP::remote_addr]->[IP::local_addr]:[TCP::local_port] version wrong."
    HTTP::redirect "http://www.au.edu.tw"
  }

  # Check FQDN.
  if { [string tolower [HTTP::host]] contains "www.jal.tw"} {
    # use specify service group
    pool www_service_group
  } elseif { [string tolower [HTTP::host]] ends_with "jal.tw"} {
    # do nothing use default service group.
  } else {
    log local0. "[IP::remote_addr]->[IP::local_addr]:[TCP::local_port] FQDN failed."
    HTTP::redirect "https://www.google.com"
  }
}