# File lib/rack/showexceptions.rb, line 23
23:     def call(env)
24:       @app.call(env)
25:     rescue StandardError, LoadError, SyntaxError => e
26:       backtrace = pretty(env, e)
27:       [500,
28:        {"Content-Type" => "text/html",
29:         "Content-Length" => backtrace.join.size.to_s},
30:        backtrace]
31:     end