csrf: improve validation #137
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With this PR the behaviour changes in the following way
Wrong method returns 405 (before it was returning 400 - Referer checking failed - no Referer.)
Wrong method with wrong token returns wrong token (before it was returning 400 - Referer checking failed - no Referer.)
If no token is set, nothing is checked (before it was returning 400 - Referer checking failed - no Referer.)