New in Symfony 2.4: Easier debugging of not-found resources
Warning: This post is about an unsupported Symfony version. Some of this information may be out of date. Read the most recent Symfony Docs.
When a 404 occurs in a web application, knowing the root cause helps fixing the problem: is it someone trying to hack your website by trying different well-known URLs? Is it a dead-link on your website? or on another one? If the 404 comes from your website, fixing it should be relatively easy.
The only source of information about the cause is the HTTP
And even if it cannot be trusted, it can help nonetheless. That's why as of
Symfony 2.4, the HTTP
Referer is added in the
exception message thrown by the router listener.
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