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@@ -160,10 +160,13 @@ module Sinatra
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     def invoke(request)
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       params = {}
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-      if options[:agent] 
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-        return unless request.user_agent =~ options[:agent]
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+      if agent = options[:agent] 
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+        return unless request.user_agent =~ agent
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         params[:agent] = $~[1..-1]
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       end
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+      if host = options[:host] 
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+        return unless host === request.host
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+      end
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       return unless pattern =~ request.path_info.squeeze('/')
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       params.merge!(param_keys.zip($~.captures.map(&:from_param)).to_hash)
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       Result.new(block, params, 200)