CGI programming

Usage:cgi_read_request(Request)

Obtain a HTTP request from the CGI environment variables (for headers) and input stream data (for contents). This request can be processed with other predicates in the http_server libraries.

Unifies URL with the Uniform Resource Locator (WWW address) of this cgi executable.

Usage:

• Call and exit should be compatible with:
  (basic_props:string/1)URL is a string (a list of character codes).
• The following properties should hold upon exit:
  (basic_props:string/1)URL is a string (a list of character codes).

Sets a cookie of name Name and value Value (it must be called before cgi_write_response/1)

Usage:

• The following properties should hold at call time:
  (basic_props:atm/1)Name is an atom.
  (basic_props:constant/1)Value is an atomic term (an atom or a number).

Unifies Cookies with a dictionary of attribute=value pairs of the active cookies for this URL. If the flag raw_form_values is on, values are always atoms even if they could be interpreted as numbers.

Usage:

• The following properties should hold at call time:
  (term_typing:var/1)Cookies is a free variable.
• The following properties should hold upon exit:
  (http_forms:value_dict/1)Cookies is a dictionary of values. It is a list of pairs atom=constant.

Usage:cgi_write_response(Response)

Writes the CGI response (similar to a HTTP response but sent through stdout)

Usage:define_flag(Flag,FlagValues,Default)

• The following properties hold upon exit:
  (basic_props:atm/1)Flag is an atom.
  (basic_props:flag_values/1)Define the valid flag values