This file lists problems that still remain even with the proxy.

- MIME checking can't be done perfectly. Especially the text/* type
  can't be checked without errors.

- Even though we configure 'good' protocols others can't be suppressed.
  The user may still enter an URI in the 'Location:' input field of the
  browser. We can only check this *if* the browser initiates a GET request
  after this. However, the browser may open a connection via plugins and
  therefore *not* init. a GET request.