Prevent warnings if the app isn't setting a Content-Type #1
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If (for whatever reason) your app isn't setting a Content-Type header there's no point in continuing with the CSRF
Currently CSRFBlock warns something like:
Use of uninitialized value $ct in pattern match (m//) at /PATH/TO/lib/site_perl/5.12.4/Plack/Middleware/CSRFBlock.pm line 125.
Yes, the app needs fixing, but there's no reason why this middleware shouldn't DTRT and avoid spitting out warnings.