Re: html support

On 08/14/2013 11:21 PM, Josef Frydl wrote:
>  eval_fragment(Request) :-
>         http_redirect(moved, '/',Request),

http_redirect/2 is implemented by means of throw/1 and thus won't come
back.  Anything
you call afterwards is not processed.  The tracer will tell you.  Hint:

	?- tpsy(eval_fragment/1).

>         http_read_data(Request, Data, []),

I'd use http_parameters/2 here.  http_read_data only reads POST request
data and
you do a GET, so this won't work.

>         portray_clause(Data),

Neither will printing.  Anything you print goes to the browser.  If you
want to print messages for debugging, use debug/3.

> 		byl_jsem,

Don't know what this does

> 		nb_getval(counter, C), CNew is C + 1, nb_setval(counter, CNew).

This won't fly too.  global variables are thread-specific and you have
no control
over which thread will handle the request.  If you want state, use the
http_session
library, which establishes as session with the browser and provides
predicates to
associate data with the predicates.

Please work through the tutorials to get the basics:

	http://www.pathwayslms.com/swipltuts/html/index.html
	http://www.swi-prolog.org/howto/http/

	Cheers --- Jan