env_name(key)
private
Converts an HTTP header name to an environment variable name if it is not
contained within the headers hash.
# File actionpack/lib/action_dispatch/http/headers.rb, line 123
def env_name(key)
key = key.to_s
if HTTP_HEADER.match?(key)
key = key.upcase
key.tr!("-", "_")
key.prepend("HTTP_") unless CGI_VARIABLES.include?(key)
end
key
end
