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<title>Apache HTTP Server: Notes about Compatibility with
NCSA's Server</title>
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<h3>Apache HTTP Server Version 1.3</h3>
<p><small><em>Is this the version you want? For more recent
versions, check our <a href="/docs/">documentation
index</a>.</em></small></p>
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<h1 align="CENTER">Compatibility Notes with NCSA's Server</h1>
<hr />
While Apache is for the most part a drop-in replacement for
NCSA's httpd, there are a couple gotcha's to watch out for.
These are mostly due to the fact that the parser for config and
access control files was rewritten from scratch, so certain
liberties the earlier servers took may not be available here.
These are all easily fixable. If you know of other problems
that belong here, <a
href="http://httpd.apache.org/bug_report.html">let us know.</a>
<p>Please also check the <a
href="known_client_problems.html">known client problems</a>
page.</p>
<ol>
<li>As of Apache 1.3.1, methods named in a <a
href="../mod/core.html#limit"><samp><Limit></samp></a>
section <em>must</em> be listed in upper-case. Lower- or
mixed-case method names will result in a configuration
error.</li>
<li>The basic mod_auth <code>AuthGroupFile</code>-specified
group file format allows commas between user names - Apache
does not.</li>
<li>If you follow the NCSA guidelines for setting up access
restrictions based on client domain, you may well have added
entries for <code>AuthType, AuthName, AuthUserFile</code> or
<code>AuthGroupFile</code>. <strong>None</strong> of these
are needed (or appropriate) for restricting access based on
client domain. When Apache sees <code>AuthType</code> it
(reasonably) assumes you are using some authorization type
based on username and password. Please remove
<code>AuthType</code>, it's unnecessary even for NCSA.</li>
<li><code>OldScriptAlias</code> is no longer supported.</li>
<li><code>exec cgi=""</code> produces reasonable
<strong>malformed header</strong> responses when used to
invoke non-CGI scripts.<br />
The NCSA code ignores the missing header (bad idea).<br />
Solution: write CGI to the CGI spec and use
<code>include virtual</code>, or use <code>exec
cmd=""</code> instead.</li>
<li>Icons for FancyIndexing broken - well, no, they're not
broken, we've just upgraded the icons from flat .xbm files to
pretty and much smaller .gif files, courtesy of <a
href="mailto:kevinh@eit.com">Kevin Hughes</a> at <a
href="http://www.eit.com/">EIT</a>. If you are using the same
srm.conf from an old distribution, make sure you add the new
<a href="../mod/mod_autoindex.html#addicon">AddIcon</a>, <a
href="../mod/mod_autoindex.html#addiconbytype">AddIconByType</a>,
and <a
href="../mod/mod_autoindex.html#defaulticon">DefaultIcon</a>
directives.</li>
<li>Apache versions before 1.2b1 will ignore the last line of
configuration files if the last line does not have a trailing
newline. This affects configuration files (httpd.conf,
access.conf and srm.conf), and htpasswd and htgroup
files.</li>
<li>Apache does not permit commas delimiting the methods in
<Limit>.</li>
<li>Apache's <code><VirtualHost></code> treats all
addresses as "optional" (<em>i.e.</em>, the server should
continue booting if it can't resolve the address). Whereas in
NCSA the default is to fail booting unless an added
<code>optional</code> keyword is included.</li>
<li>Apache does not implement <code>OnDeny</code>; use <a
href="../mod/core.html#errordocument"><code>ErrorDocument</code></a>
instead.</li>
<li>Apache (as of 1.3) always performs the equivalent of
<code>HostnameLookups minimal</code>. <code>minimal</code> is
not an option to <a
href="../mod/core.html#hostnamelookups"><code>HostnameLookups</code></a>.</li>
<li>To embed spaces in directive arguments NCSA used a
backslash before the space. Apache treats backslashes as
normal characters. To embed spaces surround the argument with
double-quotes instead.</li>
<li>Apache does not implement the NCSA <code>referer</code>
directive. See <a
href="http://bugs.apache.org/index/full/968">PR#968</a> for a
few brief suggestions on alternative ways to implement the
same thing under Apache.</li>
<li>Apache does not allow ServerRoot settings inside a
VirtualHost container. There is only one global ServerRoot in
Apache; any desired changes in paths for virtual hosts need
to be made with the explicit directives, <em>e.g.</em>,
DocumentRoot, TransferLog, <em>etc.</em></li>
<li>The <code>AddType</code> directive cannot be used to set
the type of particular files. Instead, you can scope you
directives using <Files> blocks.</li>
</ol>
More to come when we notice them....
<hr />
<h3 align="CENTER">Apache HTTP Server Version 1.3</h3>
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