symfony/symfony — pull request #3183 by odolbeau (2012-01-24 17:06:37+00:00)
Title: Authentication(Success|Failure)Handler can now return null

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes
Related to the following ticket: #838

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Correct me if I'm wrong but for now it's not possible to handle Authentication(Success|Failure) in some case only (for example to handle XmlHttpRequest on login form).

With this change, if the handler return null, the default behavior is kept.