# File lib/mini_profiler/profiler.rb, line 519
    def help(client_settings, env)
      headers = {'Content-Type' => 'text/html'}
      body = "<html><body>
<pre style='line-height: 30px; font-size: 16px;'>
Append the following to your query string:

  #{make_link "help", env} : display this screen
  #{make_link "env", env} : display the rack environment
  #{make_link "skip", env} : skip mini profiler for this request
  #{make_link "no-backtrace", env} #{"(*) " if client_settings.backtrace_none?}: don't collect stack traces from all the SQL executed (sticky, use pp=normal-backtrace to enable)
  #{make_link "normal-backtrace", env} #{"(*) " if client_settings.backtrace_default?}: collect stack traces from all the SQL executed and filter normally
  #{make_link "full-backtrace", env} #{"(*) " if client_settings.backtrace_full?}: enable full backtraces for SQL executed (use pp=normal-backtrace to disable)
  #{make_link "disable", env} : disable profiling for this session
  #{make_link "enable", env} : enable profiling for this session (if previously disabled)
  #{make_link "profile-gc", env} : perform gc profiling on this request, analyzes ObjectSpace generated by request (ruby 1.9.3 only)
  #{make_link "profile-memory", env} : requires the memory_profiler gem, new location based report
  #{make_link "flamegraph", env} : works best on Ruby 2.0, a graph representing sampled activity (requires the flamegraph gem).
  #{make_link "flamegraph&flamegraph_sample_rate=1", env}: creates a flamegraph with the specified sample rate (in ms). Overrides value set in config
  #{make_link "flamegraph_embed", env} : works best on Ruby 2.0, a graph representing sampled activity (requires the flamegraph gem), embedded resources for use on an intranet.
  #{make_link "trace-exceptions", env} : requires Ruby 2.0, will return all the spots where your application raises exceptions
  #{make_link "analyze-memory", env} : requires Ruby 2.0, will perform basic memory analysis of heap
</pre>
</body>
</html>
"

      client_settings.write!(headers)
      [200, headers, [body]]
    end