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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ This file is generated from xml source: DO NOT EDIT
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+ -->
+<title>Glossary - Apache HTTP Server</title>
+<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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+<body id="manual-page" class="no-sidebar"><div id="page-header">
+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.0</p>
+<img alt="" src="./images/feather.gif" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="./images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="./">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Glossary</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="./de/glossary.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
+<a href="./en/glossary.html" title="English">&nbsp;en&nbsp;</a> |
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+<a href="./tr/glossary.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div>
+
+ <p>This glossary defines some of the common terminology related to Apache in
+ particular, and web serving in general. More information on each concept
+ is provided in the links.</p>
+ </div>
+<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="definitions" id="definitions">Definitions</a></h2>
+
+ <dl>
+ <dt><a name="accesscontrol" id="accesscontrol">Access Control</a></dt>
+ <dd>The restriction of access to network realms. In an Apache context
+ usually the restriction of access to certain <em>URLs</em>.<br /> See: <a href="howto/auth.html">Authentication, Authorization, and Access
+ Control</a>
+ </dd>
+
+ <dt><a name="algorithm" id="algorithm">Algorithm</a></dt>
+
+ <dd>An unambiguous formula or set of rules for solving a problem in a finite
+ number of steps. Algorithms for encryption are usually called
+ <dfn>Ciphers</dfn>.
+ </dd>
+
+ <dt><a name="apacheextensiontool" id="apacheextensiontool">APache
+ eXtension Tool</a> <a name="apxs" id="apxs">(apxs)</a></dt>
+ <dd>A perl script that aids in compiling <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#module">module</a> sources into Dynamic Shared Objects
+ (<span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#dso">DSO</a>s) and helps install them in the
+ Apache Web server.<br />
+ See: Manual Page: <code class="program"><a href="./programs/apxs.html">apxs</a></code>
+ </dd>
+
+ <dt><a name="authentication" id="authentication">Authentication</a></dt>
+ <dd>The positive identification of a network entity such as a server, a
+ client, or a user.<br />
+ See: <a href="howto/auth.html">Authentication, Authorization, and Access
+ Control</a>
+ </dd>
+
+ <dt><a name="certificate" id="certificate">Certificate</a></dt>
+ <dd>A data record used for authenticating network entities such
+ as a server or a client. A certificate contains X.509 information pieces
+ about its owner (called the subject) and the signing <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#certificationauthority">Certification Authority</a> (called
+ the issuer), plus the owner's <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#publickey">public
+ key</a> and the
+ signature made by the CA. Network entities verify these signatures
+ using CA certificates.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="certificatsigningrequest" id="certificatsigningrequest">Certificate Signing Request</a>
+ <a name="csr" id="csr">(CSR)</a></dt>
+ <dd>An unsigned <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#certificate">certificate</a> for
+ submission to a <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#certificationauthority">Certification
+ Authority</a>, which signs it with the <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#privatekey">Private Key</a> of their CA
+ <em>Certificate</em>. Once the CSR is signed, it becomes a real
+ certificate.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="certificationauthority" id="certificationauthority">Certification Authority</a>
+ <a name="ca" id="ca">(CA)</a></dt>
+ <dd>A trusted third party whose purpose is to sign certificates for network
+ entities it has authenticated using secure means. Other network entities
+ can check the signature to verify that a CA has authenticated the bearer
+ of a certificate.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="cipher" id="cipher">Cipher</a></dt>
+ <dd>An algorithm or system for data encryption. Examples are DES, IDEA, RC4,
+ etc.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="ciphertext" id="ciphertext">Ciphertext</a></dt>
+ <dd>The result after <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#plaintext">Plaintext</a> is
+ passed through a <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#cipher">Cipher</a>.<br /> See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="commongatewayinterface" id="commongatewayinterface">Common
+ Gateway Interface</a> <a name="cgi" id="cgi">(CGI)</a></dt>
+ <dd>A standard definition for an interface between a web server and an
+ external program that allows the external program to service requests.
+ The interface was originally defined by <a href="http://hoohoo.ncsa.uiuc.edu/cgi/overview.html">NCSA</a> but there
+ is also an <a href="http://cgi-spec.golux.com/">RFC project</a>.<br />
+ See: <a href="howto/cgi.html">Dynamic Content with CGI</a>
+ </dd>
+
+ <dt><a name="configurationdirective" id="configurationdirective">Configuration Directive</a></dt>
+ <dd>See: <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#directive">Directive</a></dd>
+
+ <dt><a name="configurationfile" id="configurationfile">Configuration
+ File</a></dt>
+ <dd>A text file containing <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#directive">Directives</a>
+ that control the configuration of Apache.<br />
+ See: <a href="configuring.html">Configuration Files</a>
+ </dd>
+
+ <dt><a name="connect" id="connect">CONNECT</a></dt>
+ <dd>An HTTP <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#method">method</a> for proxying raw data
+ channels over HTTP. It can be used to encapsulate other protocols, such as
+ the SSL protocol.
+ </dd>
+
+ <dt><a name="context" id="context">Context</a></dt>
+ <dd>An area in the <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#configurationfile">configuration
+ files</a> where certain types of <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#directive">directives</a> are allowed.<br />
+ See: <a href="mod/directive-dict.html#Context">Terms Used to Describe
+ Apache Directives</a>
+ </dd>
+
+ <dt><a name="digitalsignature" id="digitalsignature">Digital
+ Signature</a></dt>
+ <dd>An encrypted text block that validates a certificate or other file. A
+ <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#certificationauthority">Certification Authority</a>
+ creates a signature by generating a hash of the <em>Public Key</em>
+ embedded in a <em>Certificate</em>, then encrypting the hash with its own
+ <em>Private Key</em>. Only the CA's public key can decrypt the signature,
+ verifying that the CA has authenticated the network entity that owns the
+ <em>Certificate</em>.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="directive" id="directive">Directive</a></dt>
+ <dd>A configuration command that controls one or more aspects of Apache's
+ behavior. Directives are placed in the <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#configurationfile">Configuration File</a><br />
+ See: <a href="mod/directives.html">Directive Index</a>
+ </dd>
+
+ <dt><a name="dynamicsharedobject" id="dynamicsharedobject">Dynamic
+ Shared Object</a> <a name="dso" id="dso">(DSO)</a></dt>
+ <dd><span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#module">Modules</a> compiled separately from the
+ Apache <code class="program"><a href="./programs/httpd.html">httpd</a></code> binary that can be loaded on-demand.<br />
+ See: <a href="dso.html">Dynamic Shared Object Support</a>
+ </dd>
+
+ <dt><a name="environmentvariable" id="environmentvariable">Environment
+ Variable</a> <a name="env-variable" id="env-variable">(env-variable)</a></dt>
+ <dd>Named variables managed by the operating system shell and used to store
+ information and communicate between programs. Apache also contains
+ internal variables that are referred to as environment variables, but are
+ stored in internal Apache structures, rather than in the shell
+ environment.<br />
+ See: <a href="env.html">Environment Variables in Apache</a>
+ </dd>
+
+ <dt><a name="export-crippled" id="export-crippled">Export-Crippled</a></dt>
+ <dd>Diminished in cryptographic strength (and security) in order to comply
+ with the United States' Export Administration Regulations (EAR).
+ Export-crippled cryptographic software is limited to a small key size,
+ resulting in <em>Ciphertext</em> which usually can be decrypted by brute
+ force.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="filter" id="filter">Filter</a></dt>
+ <dd>A process that is applied to data that is sent or received by the
+ server. Input filters process data sent by the client to the server,
+ while output filters process documents on the server before they are sent
+ to the client. For example, the <code>INCLUDES</code> output filter
+ processes documents for <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#ssi">Server Side
+ Includes</a>.<br />
+ See: <a href="filter.html">Filters</a>
+ </dd>
+
+ <dt><a name="fully-qualifieddomain-name" id="fully-qualifieddomain-name">Fully-Qualified Domain-Name</a>
+ <a name="fqdn" id="fqdn">(FQDN)</a></dt>
+ <dd>The unique name of a network entity, consisting of a hostname and a
+ domain name that can resolve to an IP address. For example,
+ <code>www</code> is a hostname, <code>example.com</code> is a domain name,
+ and <code>www.example.com</code> is a fully-qualified domain name.
+ </dd>
+
+ <dt><a name="handler" id="handler">Handler</a></dt>
+ <dd>An internal Apache representation of the action to be performed when a
+ file is called. Generally, files have implicit handlers, based on the file
+ type. Normally, all files are simply served by the server, but certain
+ file types are "handled" separately. For example, the
+ <code>cgi-script</code> handler designates files to be processed as
+ <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#cgi">CGIs</a>.<br />
+ See: <a href="handler.html">Apache's Handler Use</a>
+ </dd>
+
+ <dt><a name="hash" id="hash">Hash</a></dt>
+ <dd>A mathematical one-way, irreversable algorithm generating a string with
+ fixed-length from another string of any length. Different input strings
+ will usually produce different hashes (depending on the hash function).
+ </dd>
+
+ <dt><a name="header" id="header">Header</a></dt>
+ <dd>The part of the <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#http">HTTP</a> request and
+ response that is sent before the actual content, and that contains
+ meta-information describing the content.
+ </dd>
+
+ <dt><a name="htaccess" id="htaccess">.htaccess</a></dt>
+ <dd>A <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#configurationfile">configuration file</a> that
+ is placed inside the web tree and applies configuration <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#directive">directives</a> to the directory where it is
+ placed and all sub-directories. Despite its name, this file can hold
+ almost any type of directive, not just access-control directives.<br />
+ See: <a href="configuring.html">Configuration Files</a>
+ </dd>
+
+ <dt><a name="httpd.conf" id="httpd.conf">httpd.conf</a></dt>
+ <dd>The main Apache <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#configurationfile">configuration
+ file</a>. The default location is
+ <code>/usr/local/apache2/conf/httpd.conf</code>, but it may be moved using
+ run-time or compile-time configuration.<br />
+ See: <a href="configuring.html">Configuration Files</a>
+ </dd>
+
+ <dt><a name="hypertexttransferprotocol" id="hypertexttransferprotocol">HyperText Transfer Protocol</a>
+ <a name="http" id="hhtp">(HTTP)</a></dt>
+ <dd>The standard transmission protocol used on the World Wide Web. Apache
+ implements version 1.1 of the protocol, referred to as HTTP/1.1 and
+ defined by <a href="http://ietf.org/rfc/rfc2616.txt">RFC 2616</a>.
+ </dd>
+
+ <dt><a name="https" id="https">HTTPS</a></dt>
+ <dd>The HyperText Transfer Protocol (Secure), the standard encrypted
+ communication mechanism on the World Wide Web. This is actually just HTTP
+ over <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#ssl">SSL</a>.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="method" id="method">Method</a></dt>
+ <dd>In the context of <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#http">HTTP</a>, an action to
+ perform on a resource, specified on the request line by the client. Some
+ of the methods available in HTTP are <code>GET</code>, <code>POST</code>,
+ and <code>PUT</code>.
+ </dd>
+
+ <dt><a name="messagedigest" id="messagedigest">Message Digest</a></dt>
+ <dd>A hash of a message, which can be used to verify that the contents of
+ the message have not been altered in transit.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="mime-type" id="mime-type">MIME-type</a></dt>
+ <dd>A way to describe the kind of document being transmitted. Its name
+ comes from that fact that its format is borrowed from the Multipurpose
+ Internet Mail Extensions. It consists of a major type and a minor type,
+ separated by a slash. Some examples are <code>text/html</code>,
+ <code>image/gif</code>, and <code>application/octet-stream</code>. In
+ HTTP, the MIME-type is transmitted in the <code>Content-Type</code>
+ <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#header">header</a>.<br />
+ See: <a href="mod/mod_mime.html">mod_mime</a>
+ </dd>
+
+ <dt><a name="module" id="module">Module</a></dt>
+ <dd>An independent part of a program. Much of Apache's functionality is
+ contained in modules that you can choose to include or exclude. Modules
+ that are compiled into the Apache <code class="program"><a href="./programs/httpd.html">httpd</a></code> binary are
+ called <dfn>static modules</dfn>, while modules that are stored
+ separately and can be optionally loaded at run-time are called
+ <dfn>dynamic modules</dfn> or <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#dso">DSOs</a>.
+ Modules that are included by default
+ are called <dfn>base modules</dfn>. Many modules are available for Apache
+ that are not distributed as part of the Apache HTTP Server <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#tarball">tarball</a>. These are referred to as
+ <dfn>third-party modules</dfn>.<br />
+ See: <a href="mod/">Module Index</a>
+ </dd>
+
+ <dt><a name="modulemagicnumber" id="modulemagicnumber">Module Magic
+ Number</a> (<a name="mmn" id="mmn">MMN</a>)</dt>
+ <dd>Module Magic Number is a constant defined in the Apache source code that
+ is associated with binary compatibility of modules. It is changed when
+ internal Apache structures, function calls and other significant parts of
+ API change in such a way that binary compatibility cannot be guaranteed
+ any more. On MMN change, all third party modules have to be at least
+ recompiled, sometimes even slightly changed in order to work with the new
+ version of Apache.
+ </dd>
+
+ <dt><a name="openssl" id="openssl">OpenSSL</a></dt>
+ <dd>The Open Source toolkit for SSL/TLS<br />
+ See <a href="http://www.openssl.org/">http://www.openssl.org/</a>#
+ </dd>
+
+ <dt><a name="passphrase" id="passphrase">Pass Phrase</a></dt>
+ <dd>The word or phrase that protects private key files. It prevents
+ unauthorized users from encrypting them. Usually it's just the secret
+ encryption/decryption key used for <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#cipher">Ciphers</a>.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="plaintext" id="plaintext">Plaintext</a></dt>
+ <dd>The unencrypted text.</dd>
+
+ <dt><a name="privatekey" id="privatekey">Private Key</a></dt>
+ <dd>The secret key in a <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#publickeycryptography">Public Key
+ Cryptography</a> system, used to decrypt incoming messages and
+ sign outgoing ones.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="proxy" id="proxy">Proxy</a></dt>
+ <dd>An intermediate server that sits between the client and the <em>origin
+ server</em>. It accepts requests from clients, transmits those requests
+ on to the origin server, and then returns the response from the origin
+ server to the client. If several clients request the same content, the
+ proxy can deliver that content from its cache, rather than requesting it
+ from the origin server each time, thereby reducing response time.<br />
+ See: <a href="mod/mod_proxy.html">mod_proxy</a>
+ </dd>
+
+ <dt><a name="publickey" id="publickey">Public Key</a></dt>
+ <dd>The publicly available key in a <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#publickeycryptography">Public Key Cryptography</a> system,
+ used to encrypt messages bound for its owner and to decrypt signatures
+ made by its owner.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="publickeycryptography" id="publickeycryptography">Public Key Cryptography</a></dt>
+ <dd>The study and application of asymmetric encryption systems, which use
+ one key for encryption and another for decryption. A corresponding pair of
+ such keys constitutes a key pair. Also called Asymmetric Cryptography.
+ <br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="regularexpresion" id="regularexpresion">Regular Expression</a>
+ <a name="regex" id="regex">(Regex)</a></dt>
+ <dd>A way of describing a pattern in text - for example, "all the words that
+ begin with the letter A" or "every 10-digit phone number" or even "Every
+ sentence with two commas in it, and no capital letter Q". Regular
+ expressions are useful in Apache because they let you apply certain
+ attributes against collections of files or resources in very flexible ways
+ - for example, all .gif and .jpg files under any "images" directory could
+ be written as "<code>/images/.*(jpg|gif)$</code>". Apache uses Perl
+ Compatible Regular Expressions provided by the <a href="http://www.pcre.org/">PCRE</a> library.
+ </dd>
+
+ <dt><a name="reverseproxy" id="reverseproxy">Reverse Proxy</a></dt>
+ <dd>A <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#proxy">proxy</a> server that appears to the client
+ as if it is an <em>origin server</em>. This is useful to hide the real
+ origin server from the client for security reasons, or to load balance.
+ </dd>
+
+ <dt><a name="securesocketslayer" id="securesocketslayer">Secure Sockets
+ Layer</a> <a name="ssl" id="ssl">(SSL)</a></dt>
+ <dd>A protocol created by Netscape Communications Corporation for general
+ communication authentication and encryption over TCP/IP networks. The most
+ popular usage is <em>HTTPS</em>, i.e. the HyperText Transfer Protocol (HTTP)
+ over SSL.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="serversideincludes" id="serversideincludes">Server Side
+ Includes</a> <a name="ssi" id="ssi">(SSI)</a></dt>
+ <dd>A technique for embedding processing directives inside HTML files.<br />
+ See: <a href="howto/ssi.html">Introduction to Server Side Includes</a>
+ </dd>
+
+ <dt><a name="session" id="session">Session</a></dt>
+ <dd>The context information of a communication in general.</dd>
+
+ <dt><a name="ssleay" id="ssleay">SSLeay</a></dt>
+ <dd>The original SSL/TLS implementation library developed by Eric A.
+ Young
+ </dd>
+
+ <dt><a name="symmetriccryptophraphy" id="symmetriccryptophraphy">Symmetric
+ Cryptography</a></dt>
+ <dd>The study and application of <em>Ciphers</em> that use a single secret key
+ for both encryption and decryption operations.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="tarball" id="tarball">Tarball</a></dt>
+ <dd>A package of files gathered together using the <code>tar</code> utility.
+ Apache distributions are stored in compressed tar archives or using
+ pkzip.
+ </dd>
+
+ <dt><a name="transportlayersecurity" id="transportlayersecurity">Transport
+ Layer Security</a> <a name="tls" id="tls">(TLS)</a></dt>
+ <dd>The successor protocol to SSL, created by the Internet Engineering Task
+ Force (IETF) for general communication authentication and encryption over
+ TCP/IP networks. TLS version 1 is nearly identical with SSL version 3.<br />
+ See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+
+ <dt><a name="uniformresourcelocator" id="uniformresourcelocator">Uniform
+ Resource Locator</a> <a name="url" id="url">(URL)</a></dt>
+ <dd>The name/address of a resource on the Internet. This is the common
+ informal term for what is formally called a <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#uniformresourceidentifier">Uniform Resource Identifier</a>.
+ URLs are usually made up of a scheme, like <code>http</code> or
+ <code>https</code>, a hostname, and a path. A URL for this page is
+ <code>http://httpd.apache.org/docs/2.0/glossary.html</code>.
+ </dd>
+
+ <dt><a name="uniformresourceidentifier" id="uniformresourceidentifier">Uniform Resource Identifier</a>
+ <a name="URI" id="URI">(URI)</a></dt>
+ <dd>A compact string of characters for identifying an abstract or physical
+ resource. It is formally defined by <a href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>. URIs used on the
+ world-wide web are commonly referred to as <span title="see glossary">&#8594;</span>&nbsp;<a href="./glossary.html#url">URLs</a>.
+ </dd>
+
+ <dt><a name="virtualhosting" id="virtualhosting">Virtual Hosting</a></dt>
+ <dd>Serving multiple websites using a single instance of Apache. <em>IP
+ virtual hosting</em> differentiates between websites based on their IP
+ address, while <em>name-based virtual hosting</em> uses only the name of the
+ host and can therefore host many sites on the same IP address.<br />
+ See: <a href="vhosts/">Apache Virtual Host documentation</a>
+ </dd>
+
+ <dt><a name="x.509" id="x.509">X.509</a></dt>
+ <dd>An authentication certificate scheme recommended by the International
+ Telecommunication Union (ITU-T) which is used for SSL/TLS authentication.<br /> See: <a href="ssl/">SSL/TLS Encryption</a>
+ </dd>
+</dl>
+</div></div>
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