109 lines
2.9 KiB
HTML
109 lines
2.9 KiB
HTML
<HTML>
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<!-- 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 -->
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<LINK rel="stylesheet" href="pillow_doc.css" type="text/css">
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<TITLE>The PiLLoW Web Programming Library - HTTP conectivity</TITLE>
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<BODY>
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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>.
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<P><HR><P>
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<H1><A NAME="SEC10" HREF="pillow_doc_toc.html#TOC10">HTTP conectivity</A></H1>
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<P>
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<STRONG>Author(s):</STRONG> Daniel Cabeza.
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<P>
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<STRONG>Version:</STRONG> 1.7 (2000/7/12, 19:1:20 CEST)
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<P>
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<STRONG>Version of last change:</STRONG> 1.3#114 (1999/11/24, 0:57:16 MET)
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<P>
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This module implements the
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<A NAME="IDX102"></A>
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HTTP protocol, which allows retrieving data from HTTP servers.
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<UL>
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<LI><A HREF="pillow_doc_4.html#SEC11">Usage and interface (http)</A>
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<LI><A HREF="pillow_doc_4.html#SEC12">Documentation on exports (http)</A>
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</UL>
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<H2><A NAME="SEC11" HREF="pillow_doc_toc.html#TOC11">Usage and interface (<CODE>http</CODE>)</A></H2>
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<div class="cartouche">
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<UL>
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<LI><STRONG>Library usage:</STRONG>
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<CODE>:- use_module(library(http)).</CODE>
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<LI><STRONG>Exports:</STRONG>
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<UL>
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<LI><EM>Predicates:</EM>
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<A NAME="IDX103"></A>
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<CODE>fetch_url/3</CODE>.
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</UL>
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</UL>
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</div class="cartouche">
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<H2><A NAME="SEC12" HREF="pillow_doc_toc.html#TOC12">Documentation on exports (<CODE>http</CODE>)</A></H2>
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<P>
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<A NAME="IDX104"></A>
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<A NAME="IDX105"></A>
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<DL>
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<DT><span class="define">PREDICATE:</span> <B>fetch_url/3:</B>
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<DD><A NAME="IDX106"></A>
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<P>
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<CODE>fetch_url(URL,Request,Response)</CODE>
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<P>
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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>.
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<P>
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<STRONG>Usage:</STRONG> <CODE>fetch_url(URL,Request,Response)</CODE>
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<UL>
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<LI><EM>The following properties should hold at call time:</EM>
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<CODE>URL</CODE> specifies a URL.
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(<CODE>url_term/1</CODE>)
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<CODE>Request</CODE> is a list of <CODE>http_request_param</CODE>s.
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(<CODE>list/2</CODE>)
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<LI><EM>The following properties hold upon exit:</EM>
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<CODE>Response</CODE> is a list of <CODE>http_response_param</CODE>s.
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(<CODE>list/2</CODE>)
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</UL>
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</DL>
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<P><HR><P>
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