id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
21143	Add a hook for when no blog is found (in addition to NOBLOGREDIRECT)	jamescollins		"(Related to #21142)

'''Background'''

On a multisite install, we allow users to change their subdomain name (or domain name).

We keep a list of their previously used subdomains/domains, and if there is a HTTP request for one of their old domains, we automatically perform a 301 redirect to the new domain name.

'''Problem'''

In order to perform a 301 redirect from and old domain to the new domain, we currently have to use wp-content/sunrise.php.

However we would like to take advantage of the logic at the top of wp-includes/ms-settings.php, rather than re-inventing that logic in our sunrise.php file.

The NOBLOGREDIRECT constant can be used for this, but it does not allow us to perform a 301 redirect.

'''Solution'''

Adding a simple hook to ms-settings.php would allow a sunrise.php file to determine what should happen if a HTTP request on a Multisite install does not correspond to one of the existing sites/blogs.
See attached patch."	enhancement	new	normal	Future Release	Multisite		normal		has-patch