<HTML> <HEAD> <!-- Created by texi2html 1.56k + clip patches and <A href="http://www.clip.dia.fi.upm.es/Software">lpdoc</A> from ciao.texi on 28 January 2007 --> <LINK rel="stylesheet" href="ciao.css" type="text/css"> <TITLE>The Ciao Prolog System - HTTP conectivity</TITLE> </HEAD> <BODY> Go to the <A HREF="ciao_1.html">first</A>, <A HREF="ciao_145.html">previous</A>, <A HREF="ciao_147.html">next</A>, <A HREF="ciao_241.html">last</A> section, <A HREF="ciao_toc.html">table of contents</A>. <P><HR><P> <H1><A NAME="SEC604" HREF="ciao_toc.html#TOC604">HTTP conectivity</A></H1> <P> <A NAME="IDX6689"></A> <P> <STRONG>Author(s):</STRONG> Daniel Cabeza. <P> <STRONG>Version:</STRONG> 1.10#7 (2006/4/26, 19:22:13 CEST) <P> <STRONG>Version of last change:</STRONG> 1.3#114 (1999/11/24, 0:57:16 MET) <P> This module implements the <A NAME="IDX6690"></A> HTTP protocol, which allows retrieving data from HTTP servers. <UL> <LI><A HREF="ciao_146.html#SEC605">Usage and interface (http)</A> <LI><A HREF="ciao_146.html#SEC606">Documentation on exports (http)</A> </UL> <H2><A NAME="SEC605" HREF="ciao_toc.html#TOC605">Usage and interface (<CODE>http</CODE>)</A></H2> <div class="cartouche"> <UL> <LI><STRONG>Library usage:</STRONG> <CODE>:- use_module(library(http)).</CODE> <LI><STRONG>Exports:</STRONG> <UL> <LI><EM>Predicates:</EM> <A NAME="IDX6691"></A> <CODE>fetch_url/3</CODE>. </UL> <LI><STRONG>Other modules used:</STRONG> <UL> <LI><EM>System library modules:</EM> <A NAME="IDX6692"></A> <CODE>strings</CODE>, <A NAME="IDX6693"></A> <CODE>lists</CODE>, <A NAME="IDX6694"></A> <CODE>pillow/pillow_aux</CODE>, <A NAME="IDX6695"></A> <CODE>pillow/pillow_types</CODE>, <A NAME="IDX6696"></A> <CODE>pillow/http_ll</CODE>. </UL> </UL> </div class="cartouche"> <H2><A NAME="SEC606" HREF="ciao_toc.html#TOC606">Documentation on exports (<CODE>http</CODE>)</A></H2> <P> <A NAME="IDX6697"></A> <A NAME="IDX6698"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>fetch_url/3:</B> <DD><A NAME="IDX6699"></A> <P> <CODE>fetch_url(URL, Request, Response)</CODE> <P> Fetches the document pointed to by <CODE>URL</CODE> from Internet, using request parameters <CODE>Request</CODE>, and unifies <CODE>Response</CODE> with the parameters of the response. Fails on timeout. Note that redirections are not handled automatically, that is, if <CODE>Response</CODE> contains terms of the form <CODE>status(redirection,301,_)</CODE> and <CODE>location(NewURL)</CODE>, the program should in most cases access location <CODE>NewURL</CODE>. <P> <STRONG>Usage:</STRONG> <CODE>fetch_url(URL, Request, Response)</CODE> <UL> <LI><EM>The following properties should hold at call time:</EM> <CODE>URL</CODE> specifies a URL. (<CODE>pillow_types:url_term/1</CODE>) <CODE>Request</CODE> is a list of <CODE>http_request_param</CODE>s. (<CODE>basic_props:list/2</CODE>) <LI><EM>The following properties hold upon exit:</EM> <CODE>Response</CODE> is a list of <CODE>http_response_param</CODE>s. (<CODE>basic_props:list/2</CODE>) </UL> </DL> <P><HR><P> Go to the <A HREF="ciao_1.html">first</A>, <A HREF="ciao_145.html">previous</A>, <A HREF="ciao_147.html">next</A>, <A HREF="ciao_241.html">last</A> section, <A HREF="ciao_toc.html">table of contents</A>. </BODY> </HTML>
