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<H3><A NAME="SECTION008121000000000000000"> </A>
<BR>
6.1.2.1 Traversal
</H3>
<P>
The Publisher handler locates and imports the module specified in the
URI. The module location is determined from the
<tt class="class">Request.filename</tt> attribute. Before importing, the file extension,
if any, is discarded.
<P>
Once module is imported, the remaining part of the URI up to the
beginning of any query data (a.k.a. PATH_INFO) is used to find an
object within the module. The Publisher handler <i class="dfn">traverses</i> the
path, one element at a time from left to right, mapping the elements
to Python object within the module.
<P>
The traversal will stop and <tt class="constant">HTTP_NOTFOUND</tt> will be returned to
the client if:
<P>
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<LI>Any of the traversed object's names begin with an underscore
("<tt class="samp">_</tt>"). Use underscores to protect objects that should not be
accessible from the web.
<P>
</LI>
<LI>A module is encountered. Published objects cannot be modules for
security reasons.
<P>
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If an object in the path could not be found, <tt class="constant">HTTP_NOT_FOUND</tt>
is returned to the client.
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<span class="release-info">Release 2.7.10, documentation updated on December 07, 2003.</span>
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