I guess I'm not understanding the question.
If you want to access a HTTP header such as HTTP_USER_AGENT, you can just
pull it out of the request.env hash:
puts request.env["HTTP_USER_AGENT"]
Does it matter that there are other rails keys in the hash?
You can also print all the headers beginning with HTTP by using match if you
want:
<% for header in request.env.select { |key, val| k.match("^HTTP.*")} %>
<%= key %> <%= val %>
<% end %>
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