Re: Error when referencing http_parameters

yes - with POST the query string type data gets passed in the body of the request. 
 the post data gets read the first time http_parameters gets called, and the second time it hangs.

It's a bit of a wart. 8c/  

change your request to a GET temporarily and see if it clears up. If so, that's your problem. 


________________________________
 From: Phillip Soltan <[email protected]>
To: [email protected] 
Sent: Thursday, December 19, 2013 2:18 PM
Subject: [SWIPL] Error when referencing http_parameters
 

Hello,

I recently discovered that an HTTP package was added to SWI Prolog and I
thought this was the perfect solution for me.  Between the documentation,
reading the module code and stepping through the modules with the debugger,
I think it is going to be suitable for a web site I'm building.

I've run into a problem and I'm wondering if someone could help.  I've
created a predicate that handles showing the login page:

login_page(Request) :-
html_set_options([dialect('html5')]),
(http_session_data(lang(_));http_session_asserta(lang('en'))),
(memberchk(method(post),Request) ->
http_parameters(Request,
                        [ email(Email_value, [default('empty')]),
                          password(Pass_value, [default('empty')])
                        ]);
        Email_value = '[email protected]',
        Pass_value = 'password'
    ),
reply_html_page(
[title('Login Page')],
           ........ snip .......

It gets called directly from the handler when there is a GET to the login
url (http://localhost/login) and also gets called from the login action
predicate:

% handle case of invalid email address
login_action_page(Request) :-
http_parameters(Request,
                        [ email(Email, [default('empty')]),
                          password(_Pass, [default('empty')])
                        ]),
    \+epassword(Email,_),
    asserta(login_error('unrecognized email')),
login_page(Request).


The login_action_page handles the POST request when the submit button is
pressed.  It calls login_page to show the login page again showing which
field has erroneous data.

The POST request times out and return the error:

*copy_stream_data/3: Timeout in read from <stream>(0x888eaa0)*

This is the result of the second call to http_parameters.  I guess my
questions are:

Why?  Is there some reason I can't call http_parameters twice with the same
request?


Thank you in advance,

Phillip Soltan
email: [email protected]
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