LWP::UserAgent and HTTP_ACCEPT

I want to accept only certain mime types with LWP::UserAgent. What is the
most failsafe way to do this? I doubt that sending an accept header is
100% safe, so I was thinking about setting up a callback which checks the
content-type(s) and dies if none is acceptable (probably in combination
with setting the HTTP_ACCEPT header beforehand).

Has anyone done this before, and is this a good way to do this?

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