standard way to disable X-powered-by header in Passenger?

Question

I couldn't find any way to disable Passenger's X-Powered-By header:

X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 3.0.11

Is it possible to do that without modifying its sources and removing headers on the HTTP server level?

Answer 1

Short answer: no.

There is no configuration option in passenger to disable the X-Powered-by, so you need to do one of

• filter
• edit source
• monkeypatch

passenger code:

  #RequestHandler::process_request
  headers_output = [
    STATUS, status.to_i.to_s, CRLF,
    X_POWERED_BY, @passenger_header, CRLF
  ]

  #AbstractRequestHandler::initialize
  @passenger_header   = determine_passenger_header

  #AbstractRequestHandler::determine_passenger_header
  def determine_passenger_header
    header = "Phusion Passenger (mod_rails/mod_rack)"
    if @options["show_version_in_header"]
      header << " #{VERSION_STRING}"
    end
    if File.exist?("#{SOURCE_ROOT}/enterprisey.txt") ||
       File.exist?("/etc/passenger_enterprisey.txt")
      header << ", Enterprise Edition"
    end
    return header
  end