Mitigate CSRF attacks #206
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…Type Header for all non-GET requests to prevent CSRF attacks
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This PR implements a simple mitigation for CSRF attacks. See here for a good read about this.
CSRF-Tokens would be a better solution of course, but I wasn't sure about how to implement this in the existing codebase cleanly. But the approach in this PR should be sufficient, too.
It also removes the CORS exceptions which were pretty wide (wildcard). I couln't imagine, why these would be necessary in the scope of this app.