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module Unicorn

  # Every standard HTTP code mapped to the appropriate message.  These are
  # used so frequently that they are placed directly in Unicorn for easy
  # access rather than Unicorn::Const itself.
  HTTP_STATUS_CODES = {  
    100  => 'Continue', 
    101  => 'Switching Protocols', 
    200  => 'OK', 
    201  => 'Created', 
    202  => 'Accepted', 
    203  => 'Non-Authoritative Information', 
    204  => 'No Content', 
    205  => 'Reset Content', 
    206  => 'Partial Content', 
    300  => 'Multiple Choices', 
    301  => 'Moved Permanently', 
    302  => 'Moved Temporarily', 
    303  => 'See Other', 
    304  => 'Not Modified', 
    305  => 'Use Proxy', 
    400  => 'Bad Request', 
    401  => 'Unauthorized', 
    402  => 'Payment Required', 
    403  => 'Forbidden', 
    404  => 'Not Found', 
    405  => 'Method Not Allowed', 
    406  => 'Not Acceptable', 
    407  => 'Proxy Authentication Required', 
    408  => 'Request Time-out', 
    409  => 'Conflict', 
    410  => 'Gone', 
    411  => 'Length Required', 
    412  => 'Precondition Failed', 
    413  => 'Request Entity Too Large', 
    414  => 'Request-URI Too Large', 
    415  => 'Unsupported Media Type', 
    500  => 'Internal Server Error', 
    501  => 'Not Implemented', 
    502  => 'Bad Gateway', 
    503  => 'Service Unavailable', 
    504  => 'Gateway Time-out', 
    505  => 'HTTP Version not supported'
  }

  # 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.
  #
  # While Unicorn does try to emulate the CGI/1.2 protocol, it does not use the REMOTE_IDENT,
  # REMOTE_USER, or REMOTE_HOST parameters since those are either a security problem or 
  # too taxing on performance.
  module Const
    DATE="Date".freeze

    # This is the part of the path after the SCRIPT_NAME.
    PATH_INFO="PATH_INFO".freeze
    
    # Request body
    HTTP_BODY="HTTP_BODY".freeze

    # This is the initial part that your handler is identified as by URIClassifier.
    SCRIPT_NAME="SCRIPT_NAME".freeze

    # The original URI requested by the client.  Passed to URIClassifier to build PATH_INFO and SCRIPT_NAME.
    REQUEST_URI='REQUEST_URI'.freeze
    REQUEST_PATH='REQUEST_PATH'.freeze
    
    UNICORN_VERSION="0.1.0".freeze

    UNICORN_TMP_BASE="unicorn".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 standard empty 404 response for bad requests.  Use Error4040Handler for custom stuff.
    ERROR_404_RESPONSE="HTTP/1.1 404 Not Found\r\nConnection: close\r\nServer: Unicorn #{UNICORN_VERSION}\r\n\r\nNOT FOUND".freeze

    CONTENT_LENGTH="CONTENT_LENGTH".freeze

    # A common header for indicating the server is too busy.  Not used yet.
    ERROR_503_RESPONSE="HTTP/1.1 503 Service Unavailable\r\n\r\nBUSY".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

    # A frozen format for this is about 15% faster
    CONTENT_TYPE = "Content-Type".freeze
    LAST_MODIFIED = "Last-Modified".freeze
    ETAG = "ETag".freeze
    REQUEST_METHOD="REQUEST_METHOD".freeze
    GET="GET".freeze
    HEAD="HEAD".freeze
    # ETag is based on the apache standard of hex mtime-size-inode (inode is 0 on win32)
    ETAG_FORMAT="\"%x-%x-%x\"".freeze
    LINE_END="\r\n".freeze
    REMOTE_ADDR="REMOTE_ADDR".freeze
    HTTP_X_FORWARDED_FOR="HTTP_X_FORWARDED_FOR".freeze
    HTTP_IF_MODIFIED_SINCE="HTTP_IF_MODIFIED_SINCE".freeze
    HTTP_IF_NONE_MATCH="HTTP_IF_NONE_MATCH".freeze
    REDIRECT = "HTTP/1.1 302 Found\r\nLocation: %s\r\nConnection: close\r\n\r\n".freeze
    HOST = "HOST".freeze
    CONNECTION = "Connection".freeze
  end

end