Editing Manual/Short URL (section)

== Troubleshooting == <!--T:68-->

=== Ampersand (<tvar name=1>&</tvar>) problem === <!--T:69-->
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<translate><!--T:70--> The ampersand problem shows up when you have page titles with symbols in them (such as <tvar name=1></tvar>) which, despite being correctly encoded in the link, are not being passed correctly from <tvar name=2>mod_rewrite</tvar> to the script.</translate>
<translate><!--T:71--> This manifests in 404 page-not-found errors, because the title gets cut off at the special character.</translate>
<translate><!--T:72--> For example, clicking on a link to "John & Maria's page" gets a 404, because MediaWiki is looking for a page named "John ".</translate>

<translate><!--T:73--> This is because ampersands in long-form names are treated as [[w:Query string|query string]] separators, and would never reach the PHP [[w:Run time (program lifecycle phase)|runtime environment]].</translate>
<translate><!--T:74--> This is caused by an old and problematic <tvar name=1>mod_rewrite</tvar> bug.</translate><ref><translate><!--T:138--> [<tvar name=url>https://bz.apache.org/bugzilla/show_bug.cgi?id=34602</tvar> Bugzilla <tvar name=1>mod_rewrite</tvar> for ampersand bug], partially resolved for some users, but only after 13 years</translate></ref>

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<!--T:75-->
'''Solution:'''
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<translate><!--T:76--> This issue is caused by the <tvar name=1><code>?title=$1</code></tvar> portion of rewrite rules like <tvar name=2><code>/index.php?title=$1</code></tvar> which is completely unnecessary and harmful.</translate>
<translate><!--T:77--> MediaWiki parses paths directly from the <tvar name=1>REQUEST_URI</tvar>, so rewrite everything to <tvar name=2>/index.php</tvar>.</translate>

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=== Purging cache === <!--T:84-->

<!--T:85-->
If you notice that your changes to <tvar name=1><code></code></tvar> in <tvar name=2><code>LocalSettings.php</code></tvar> are not being reflected in <tvar name=3><code>example.com/wiki/Main_Page</code></tvar>, it may be due to MediaWiki's caching of the links according to previous settings.

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Go to <tvar name=1><code>example.com/wiki/Main_Page?action=purge</code></tvar> to force MediaWiki to regenerate the cached links.

<!--T:87-->
Also you can:
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# <translate><!--T:88--> execute the MySQL query <tvar name=1><code>TRUNCATE objectcache;</code></tvar>, or</translate>
# <translate><!--T:89--> Ensure <tvar name=2></tvar> is updated (if <tvar name=3></tvar> is enabled, all you have to do is edit <tvar name=1></tvar> to purge it)</translate>

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