covener at apache
Nov 4, 2009, 3:23 PM
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svn commit: r832902 - in /httpd/httpd/branches/2.2.x/docs/manual/vhosts: details.html.en details.xml
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Author: covener
Date: Wed Nov 4 23:23:07 2009
New Revision: 832902
URL: http://svn.apache.org/viewvc?rev=832902&view=rev
Log:
Merge r832759 from trunk:
ServerAlias and Listen accumulate, not supercede. The latter of course is n/a to vhosts!
Additional rewording of vhost details.
PR48125
Modified:
httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.html.en
httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.xml
Modified: httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.html.en
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.html.en?rev=832902&r1=832901&r2=832902&view=diff
==============================================================================
--- httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.html.en (original)
+++ httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.html.en Wed Nov 4 23:23:07 2009
@@ -54,49 +54,49 @@
sections.</p>
<p>The directives
- <code class="directive"><a href="../mod/mpm_common.html#listen">Listen</a></code>,
- <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code>,
- <code class="directive"><a href="../mod/core.html#serverpath">ServerPath</a></code>,
- and <code class="directive"><a href="../mod/core.html#serveralias">ServerAlias</a></code>
+ <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> and
+ <code class="directive"><a href="../mod/core.html#serverpath">ServerPath</a></code>
can appear anywhere within the definition of a server. However,
each appearance overrides the previous appearance (within that
server).</p>
- <p>The default value of the <code>Listen</code> field for
- main_server is 80. The main_server has no default
+ <p>The main_server has no default
<code>ServerPath</code>, or <code>ServerAlias</code>. The
default <code>ServerName</code> is deduced from the server's IP
address.</p>
- <p>The main_server Listen directive has two functions. One
- function is to determine the default network port Apache will
- bind to. The second function is to specify the port number
- which is used in absolute URIs during redirects.</p>
-
- <p>Unlike the main_server, vhost ports <em>do not</em> affect
- what ports Apache listens for connections on.</p>
-
+ <p>Port numbers specified in the <code>VirtualHost</code> directive do
+ not influence what port numbers Apache will listen on, they only discriminate between
+ which <code>VirtualHost</code> will be selected to handle a request.</p>
+
<p>Each address appearing in the <code>VirtualHost</code>
directive can have an optional port. If the port is unspecified
- it defaults to the value of the main_server's most recent
- <code>Listen</code> statement. The special port <code>*</code>
+ it is treated as a wildcard port. The special port <code>*</code>
indicates a wildcard that matches any port. Collectively the
entire set of addresses (including multiple <code>A</code>
record results from DNS lookups) are called the vhost's
<em>address set</em>.</p>
<p>Unless a <code class="directive"><a href="../mod/core.html#namevirtualhost">NameVirtualHost</a></code>
- directive is used for a specific IP address the first vhost
- with that address is treated as an IP-based vhost. The IP
- address can also be the wildcard <code>*</code>.</p>
+ directive is used for the exact IP address and port pair in the
+ <code>VirtualHost</code> directive, Apache selects the best match
+ only on the basis of the IP address (or wildcard) and port number.
+ If there are multiple identical best matches, the first <code>VirtualHost</code>
+ appearing in the configuration file will be selected.</p>
- <p>If name-based vhosts should be used a
+ <p>If you want Apache to <em>further</em> discriminate on the basis of the
+ HTTP <code>Host</code> header supplied by the client, the
<code>NameVirtualHost</code> directive <em>must</em> appear
- with the IP address set to be used for the name-based vhosts.
- In other words, you must specify the IP address that holds the
- hostname aliases (CNAMEs) for your name-based vhosts via a
- <code>NameVirtualHost</code> directive in your configuration
- file.</p>
+ with the exact IP address (or wildcard) and port pair used in a correspnding
+ set of <code>VirtualHost</code> directives.</p>
+
+ <p>The name-based virtual host selection occurs only after the a single IP-based
+ virtual host has been selected, and only considers the set of virtual hosts
+ the carry an identical IP address and port pair.</p>
+
+ <p>Hostnames can be used in place of IP addresses in a virtual host definition,
+ but it is resolved at startup and is not recommended.</p>
+
<p>Multiple <code>NameVirtualHost</code> directives can be used
each with a set of <code>VirtualHost</code> directives but only
@@ -158,18 +158,6 @@
<p>(To aid the readability of your configuration you should
prefer the left variant.)</p>
- <p>After parsing the <code>VirtualHost</code> directive, the
- vhost server is given a default <code>Listen</code> equal to the
- port assigned to the first name in its <code>VirtualHost</code>
- directive.</p>
-
- <p>The complete list of names in the <code>VirtualHost</code>
- directive are treated just like a <code>ServerAlias</code> (but
- are not overridden by any <code>ServerAlias</code> statement)
- if all names resolve to the same address set. Note that
- subsequent <code>Listen</code> statements for this vhost will not
- affect the ports assigned in the address set.</p>
-
<p>During initialization a list for each IP address is
generated and inserted into an hash table. If the IP address is
used in a <code>NameVirtualHost</code> directive the list
@@ -347,8 +335,7 @@
configuration file has the highest priority for its
corresponding address set.</li>
- <li>For security reasons the port number given in a
- <code>Host:</code> header field is never used during the
+ <li>The <code>Host:</code> header field is never used during the
matching process. Apache always uses the real port to which
the client sent the request.</li>
@@ -373,7 +360,9 @@
<code>Listen</code> by default. A wildcard port can be
specified (<em>i.e.</em>, <code>_default_:*</code>) to catch
requests to any available port. This also applies to
- <code>NameVirtualHost *</code> vhosts.</li>
+ <code>NameVirtualHost *</code> vhosts. Note that this is simply an
+ extension of the "best match" principle, as a specific and exact match
+ is favored over a wildcard.</li>
<li>The main_server is only used to serve a request if the IP
address and port number to which the client connected is
Modified: httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.xml
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.xml?rev=832902&r1=832901&r2=832902&view=diff
==============================================================================
--- httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.xml (original)
+++ httpd/httpd/branches/2.2.x/docs/manual/vhosts/details.xml Wed Nov 4 23:23:07 2009
@@ -50,49 +50,49 @@
sections.</p>
<p>The directives
- <directive module="mpm_common">Listen</directive>,
- <directive module="core">ServerName</directive>,
- <directive module="core">ServerPath</directive>,
- and <directive module="core">ServerAlias</directive>
+ <directive module="core">ServerName</directive> and
+ <directive module="core">ServerPath</directive>
can appear anywhere within the definition of a server. However,
each appearance overrides the previous appearance (within that
server).</p>
- <p>The default value of the <code>Listen</code> field for
- main_server is 80. The main_server has no default
+ <p>The main_server has no default
<code>ServerPath</code>, or <code>ServerAlias</code>. The
default <code>ServerName</code> is deduced from the server's IP
address.</p>
- <p>The main_server Listen directive has two functions. One
- function is to determine the default network port Apache will
- bind to. The second function is to specify the port number
- which is used in absolute URIs during redirects.</p>
-
- <p>Unlike the main_server, vhost ports <em>do not</em> affect
- what ports Apache listens for connections on.</p>
-
+ <p>Port numbers specified in the <code>VirtualHost</code> directive do
+ not influence what port numbers Apache will listen on, they only discriminate between
+ which <code>VirtualHost</code> will be selected to handle a request.</p>
+
<p>Each address appearing in the <code>VirtualHost</code>
directive can have an optional port. If the port is unspecified
- it defaults to the value of the main_server's most recent
- <code>Listen</code> statement. The special port <code>*</code>
+ it is treated as a wildcard port. The special port <code>*</code>
indicates a wildcard that matches any port. Collectively the
entire set of addresses (including multiple <code>A</code>
record results from DNS lookups) are called the vhost's
<em>address set</em>.</p>
<p>Unless a <directive module="core">NameVirtualHost</directive>
- directive is used for a specific IP address the first vhost
- with that address is treated as an IP-based vhost. The IP
- address can also be the wildcard <code>*</code>.</p>
+ directive is used for the exact IP address and port pair in the
+ <code>VirtualHost</code> directive, Apache selects the best match
+ only on the basis of the IP address (or wildcard) and port number.
+ If there are multiple identical best matches, the first <code>VirtualHost</code>
+ appearing in the configuration file will be selected.</p>
- <p>If name-based vhosts should be used a
+ <p>If you want Apache to <em>further</em> discriminate on the basis of the
+ HTTP <code>Host</code> header supplied by the client, the
<code>NameVirtualHost</code> directive <em>must</em> appear
- with the IP address set to be used for the name-based vhosts.
- In other words, you must specify the IP address that holds the
- hostname aliases (CNAMEs) for your name-based vhosts via a
- <code>NameVirtualHost</code> directive in your configuration
- file.</p>
+ with the exact IP address (or wildcard) and port pair used in a correspnding
+ set of <code>VirtualHost</code> directives.</p>
+
+ <p>The name-based virtual host selection occurs only after the a single IP-based
+ virtual host has been selected, and only considers the set of virtual hosts
+ the carry an identical IP address and port pair.</p>
+
+ <p>Hostnames can be used in place of IP addresses in a virtual host definition,
+ but it is resolved at startup and is not recommended.</p>
+
<p>Multiple <code>NameVirtualHost</code> directives can be used
each with a set of <code>VirtualHost</code> directives but only
@@ -154,18 +154,6 @@
<p>(To aid the readability of your configuration you should
prefer the left variant.)</p>
- <p>After parsing the <code>VirtualHost</code> directive, the
- vhost server is given a default <code>Listen</code> equal to the
- port assigned to the first name in its <code>VirtualHost</code>
- directive.</p>
-
- <p>The complete list of names in the <code>VirtualHost</code>
- directive are treated just like a <code>ServerAlias</code> (but
- are not overridden by any <code>ServerAlias</code> statement)
- if all names resolve to the same address set. Note that
- subsequent <code>Listen</code> statements for this vhost will not
- affect the ports assigned in the address set.</p>
-
<p>During initialization a list for each IP address is
generated and inserted into an hash table. If the IP address is
used in a <code>NameVirtualHost</code> directive the list
@@ -343,8 +331,7 @@
configuration file has the highest priority for its
corresponding address set.</li>
- <li>For security reasons the port number given in a
- <code>Host:</code> header field is never used during the
+ <li>The <code>Host:</code> header field is never used during the
matching process. Apache always uses the real port to which
the client sent the request.</li>
@@ -369,7 +356,9 @@
<code>Listen</code> by default. A wildcard port can be
specified (<em>i.e.</em>, <code>_default_:*</code>) to catch
requests to any available port. This also applies to
- <code>NameVirtualHost *</code> vhosts.</li>
+ <code>NameVirtualHost *</code> vhosts. Note that this is simply an
+ extension of the "best match" principle, as a specific and exact match
+ is favored over a wildcard.</li>
<li>The main_server is only used to serve a request if the IP
address and port number to which the client connected is
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