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This fixes a big problem with nginx. nginx does not send some headers if they have an underscore in them. Since this is a Rack middleware, all headers will be converted into HTTP_FOO_BAR. The original header may have been Foo-Bar or Foo_Bar. We may never know. Actually is a very annoying problem with rack because you can't access the original headers. So, we simply replace
_
's with-
and everything is cool. Most likely the_
's were-
's in the first place.