module Unicorn

  # Frequently used constants when constructing requests or responses.  Many times
  # the constant just refers to a string with the same contents.  Using these constants
  # gave about a 3% to 10% performance improvement over using the strings directly.
  # Symbols did not really improve things much compared to constants.
  module Const
    UNICORN_VERSION="0.8.1".freeze

    DEFAULT_HOST = "0.0.0.0".freeze # default TCP listen host address
    DEFAULT_PORT = "8080".freeze    # default TCP listen port
    DEFAULT_LISTEN = "#{DEFAULT_HOST}:#{DEFAULT_PORT}".freeze

    # The basic max request size we'll try to read.
    CHUNK_SIZE=(16 * 1024)

    # This is the maximum header that is allowed before a client is booted.  The parser detects
    # this, but we'd also like to do this as well.
    MAX_HEADER=1024 * (80 + 32)

    # Maximum request body size before it is moved out of memory and into a tempfile for reading.
    MAX_BODY=MAX_HEADER

    # common errors we'll send back
    ERROR_400_RESPONSE = "HTTP/1.1 400 Bad Request\r\n\r\n".freeze
    ERROR_500_RESPONSE = "HTTP/1.1 500 Internal Server Error\r\n\r\n".freeze

    # A frozen format for this is about 15% faster
    CONTENT_LENGTH="CONTENT_LENGTH".freeze
    REMOTE_ADDR="REMOTE_ADDR".freeze
    HTTP_X_FORWARDED_FOR="HTTP_X_FORWARDED_FOR".freeze
    RACK_INPUT="rack.input".freeze
  end

end