404: Difference between revisions
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<syntaxhighlight lang="apache"> | <syntaxhighlight lang="apache"> | ||
ErrorDocument 404 / | ErrorDocument 404 / | ||
</ | </syntaxhighlight> | ||
Here's a more interesting example for using an ErrorDocument in a virtual hosting scenario where you want to handle not just missing documents, but also 'missing' domains. | Here's a more interesting example for using an ErrorDocument in a virtual hosting scenario where you want to handle not just missing documents, but also 'missing' domains. | ||
The challenge: If there's no DocumentRoot, where will the script live? <code>[https://httpd.apache.org/docs/current/mod/mod_alias.html#alias Alias]</code> to the rescue. | The challenge: If there's no DocumentRoot, where will the script live? <code>[https://httpd.apache.org/docs/current/mod/mod_alias.html#alias Alias]</code> to the rescue. | ||
< | <syntaxhighlight lang="apache"> | ||
<VirtualHost *> | <VirtualHost *> | ||
UseCanonicalName Off | UseCanonicalName Off | ||
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ErrorDocument 404 /errors/notfound.php | ErrorDocument 404 /errors/notfound.php | ||
</VirtualHost> | </VirtualHost> | ||
</ | </syntaxhighlight> | ||
Now, when an unconfigured domain is requested, the script at /var/www/default/errors/notfound.php is invoked instead. This script can check <code><nowiki>$_SERVER['HTTP_HOST']</nowiki></code> to see what domain was requested. If it is actually configured, then we have a regular 404. If it's not configured, we can display some alternate error message. You could redirect to a "default" domain, or show a sign-up screen for your hosting service.<ref>http://serverfault.com/a/685521/192385</ref> | Now, when an unconfigured domain is requested, the script at /var/www/default/errors/notfound.php is invoked instead. This script can check <code><nowiki>$_SERVER['HTTP_HOST']</nowiki></code> to see what domain was requested. If it is actually configured, then we have a regular 404. If it's not configured, we can display some alternate error message. You could redirect to a "default" domain, or show a sign-up screen for your hosting service.<ref>http://serverfault.com/a/685521/192385</ref> | ||
{{References}} | {{References}} | ||
Latest revision as of 13:18, 24 February 2025
404 is the server response code for "Document Not Found".
You can do some interesting things with your server to provide a better (or amusing) experience to the user[1].
Here's a simple example just redirects a person to your homepage for any request that would otherwise be 'not found'. It's not actually all that helpful.
ErrorDocument 404 /Here's a more interesting example for using an ErrorDocument in a virtual hosting scenario where you want to handle not just missing documents, but also 'missing' domains.
The challenge: If there's no DocumentRoot, where will the script live? Alias to the rescue.
<VirtualHost *>
UseCanonicalName Off
VirtualDocumentRoot /var/www/clients/%-2/%0/
ServerName catchall.host
Alias /errors /var/www/default/errors/
ErrorDocument 404 /errors/notfound.php
</VirtualHost>Now, when an unconfigured domain is requested, the script at /var/www/default/errors/notfound.php is invoked instead. This script can check $_SERVER['HTTP_HOST'] to see what domain was requested. If it is actually configured, then we have a regular 404. If it's not configured, we can display some alternate error message. You could redirect to a "default" domain, or show a sign-up screen for your hosting service.[2]
