Printing an HTML document using format/2
is not a neat way of producing HTML because it is vulnerable to required
escape sequences. A high-level alternative is provided by library(http/html_write)
from the HTTP library.
The startup-time of Prolog is relatively long, in particular if the
program is large. In many cases it is much better to use the SWI-Prolog
HTTP server library and make the main web-server relay requests to the
SWI-Prolog webserver. See the SWI-Prolog
HTTP
package for details.
The CGI standard is unclear about handling Unicode data. The above
two declarations ensure the CGI script will send all data in UTF-8 and
thus provide full support of Unicode. It is assumed that browsers
generally send form-data using the same encoding as the page in which
the form appears, UTF-8 or ISO Latin-1. The current version of cgi_get_form/1
assumes the CGI data is in UTF-8.
