<HTML> <HEAD> <!-- Created by texi2html 1.56k + clip patches and <A href="http://www.clip.dia.fi.upm.es/Software">lpdoc</A> from pillow_doc.texi on 17 July 2000 --> <LINK rel="stylesheet" href="pillow_doc.css" type="text/css"> <TITLE>The PiLLoW Web Programming Library - HTTP conectivity</TITLE> </HEAD> <BODY> Go to the <A HREF="pillow_doc_1.html">first</A>, <A HREF="pillow_doc_3.html">previous</A>, <A HREF="pillow_doc_5.html">next</A>, <A HREF="pillow_doc_9.html">last</A> section, <A HREF="pillow_doc_toc.html">table of contents</A>. <P><HR><P> <H1><A NAME="SEC10" HREF="pillow_doc_toc.html#TOC10">HTTP conectivity</A></H1> <P> <STRONG>Author(s):</STRONG> Daniel Cabeza. <P> <STRONG>Version:</STRONG> 1.7 (2000/7/12, 19:1:20 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="IDX102"></A> HTTP protocol, which allows retrieving data from HTTP servers. <UL> <LI><A HREF="pillow_doc_4.html#SEC11">Usage and interface (http)</A> <LI><A HREF="pillow_doc_4.html#SEC12">Documentation on exports (http)</A> </UL> <H2><A NAME="SEC11" HREF="pillow_doc_toc.html#TOC11">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="IDX103"></A> <CODE>fetch_url/3</CODE>. </UL> </UL> </div class="cartouche"> <H2><A NAME="SEC12" HREF="pillow_doc_toc.html#TOC12">Documentation on exports (<CODE>http</CODE>)</A></H2> <P> <A NAME="IDX104"></A> <A NAME="IDX105"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>fetch_url/3:</B> <DD><A NAME="IDX106"></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>url_term/1</CODE>) <CODE>Request</CODE> is a list of <CODE>http_request_param</CODE>s. (<CODE>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>list/2</CODE>) </UL> </DL> <P><HR><P> Go to the <A HREF="pillow_doc_1.html">first</A>, <A HREF="pillow_doc_3.html">previous</A>, <A HREF="pillow_doc_5.html">next</A>, <A HREF="pillow_doc_9.html">last</A> section, <A HREF="pillow_doc_toc.html">table of contents</A>. </BODY> </HTML>