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<oembed><type>rich</type><version>1.0</version><provider_name>phorkie</provider_name><provider_url>https://p.cweiske.de/</provider_url><title>TYPO3 404 handling</title><author_name>Christian Weiske</author_name><cache_age>86400</cache_age><width>900</width><height>900</height><html>&lt;!-- embedding all files of https://p.cweiske.de/418 --&gt;
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&lt;p&gt;&lt;a class="reference external" href="https://docs.typo3.org/typo3cms/InsideTypo3Reference/CoreArchitecture/Configuration/LocalConfiguration/Index.html"&gt;https://docs.typo3.org/typo3cms/InsideTypo3Reference/CoreArchitecture/Configuration/LocalConfiguration/Index.html&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;Taken from the install tool:&lt;/p&gt;
&lt;div class="section" id="fe-pageunavailable-handling"&gt;
&lt;h1&gt;[FE][pageUnavailable_handling]&lt;/h1&gt;
&lt;p&gt;How TYPO3 should handle requests when pages are unavailable due to system problems.&lt;/p&gt;
&lt;dl class="docutils"&gt;
&lt;dt&gt;empty (default)&lt;/dt&gt;
&lt;dd&gt;An error message is shown.&lt;/dd&gt;
&lt;dt&gt;String&lt;/dt&gt;
&lt;dd&gt;HTML file or URL to show (reads content and outputs with correct headers), e.g. 'unavailable.html' or '&lt;a class="reference external" href="http://www.example.org/errors/unavailable.html"&gt;http://www.example.org/errors/unavailable.html&lt;/a&gt;'.&lt;/dd&gt;
&lt;dt&gt;Prefix &amp;quot;REDIRECT:&amp;quot;&lt;/dt&gt;
&lt;dd&gt;If prefixed &amp;quot;REDIRECT:&amp;quot; it will redirect to the URL/script after the prefix.&lt;/dd&gt;
&lt;dt&gt;Prefix &amp;quot;READFILE:&amp;quot;&lt;/dt&gt;
&lt;dd&gt;If prefixed with &amp;quot;READFILE:&amp;quot; then it will expect the remaining string to be a HTML file which will be read and outputted directly after having the marker &amp;quot;###CURRENT_URL###&amp;quot; substituted with REQUEST_URI and ###REASON### with reason text, for example: &amp;quot;READFILE:fileadmin/unavailable.html&amp;quot;.&lt;/dd&gt;
&lt;dt&gt;Prefix &amp;quot;USER_FUNCTION:&amp;quot;&lt;/dt&gt;
&lt;dd&gt;If prefixed &amp;quot;USER_FUNCTION:&amp;quot; then it will call a user function, eg. &amp;quot;USER_FUNCTION:fileadmin/class.user_unavailable.php:user_unavailable-&amp;gt;pageUnavailable&amp;quot; where the file must contain a class &amp;quot;user_unavailable&amp;quot; with a method &amp;quot;pageUnavailable&amp;quot; inside with two parameters $param and $ref. If the client matches [SYS][devIPmask], this setting is ignored and the page is shown as normal.&lt;/dd&gt;
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