require 'erb' require 'rack/request' require 'rack/utils' module Rack # Rack::ShowStatus catches all empty responses the app it wraps 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. class ShowStatus def initialize(app) @app = app @template = ERB.new(TEMPLATE) end 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"] req = Rack::Request.new(env) message = Rack::Utils::HTTP_STATUS_CODES[status.to_i] || status.to_s 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 def h(obj) # :nodoc: case obj when String Utils.escape_html(obj) else Utils.escape_html(obj.inspect) end end # :stopdoc: # adapted from Django # Copyright (c) 2005, the Lawrence Journal-World # Used under the modified BSD license: # http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5 TEMPLATE = <<'HTML' <%=h message %> at <%=h req.script_name + req.path_info %>

<%=h message %> (<%= status.to_i %>)

Request Method: <%=h req.request_method %>
Request URL: <%=h req.url %>

<%= detail %>

You're seeing this error because you use Rack::ShowStatus.

HTML # :startdoc: end end