Rack::ShowStatus catches all empty responses and replaces them with a site explaining the error.
Additional details can be put into rack.showstatus.detail and will be shown as HTML. If such details exist, the error page is always rendered, even if the reply was not empty.
# File lib/rack/showstatus.rb, line 19 def call(env) status, headers, body = @app.call(env) headers = Utils::HeaderHash.new(headers) empty = headers[CONTENT_LENGTH].to_i <= 0 # client or server error, or explicit message if (status.to_i >= 400 && empty) || env["rack.showstatus.detail"] # This double assignment is to prevent an "unused variable" warning on # Ruby 1.9.3. Yes, it is dumb, but I don't like Ruby yelling at me. req = req = Rack::Request.new(env) message = Rack::Utils::HTTP_STATUS_CODES[status.to_i] || status.to_s # This double assignment is to prevent an "unused variable" warning on # Ruby 1.9.3. Yes, it is dumb, but I don't like Ruby yelling at me. detail = detail = env["rack.showstatus.detail"] || message body = @template.result(binding) size = Rack::Utils.bytesize(body) [status, headers.merge(CONTENT_TYPE => "text/html", CONTENT_LENGTH => size.to_s), [body]] else [status, headers, body] end end
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