#368 MiniProfiler - RailsCastsMiniProfiler allows you to see the speed of a request conveniently on the page. It also shows the SQL queries performed and allows you to profile a specific block of code.
#151 Rack Middleware - RailsCasts
Resources Rack rack-contrib Full Episode Source Code Special thanks to Josh Peek for answering some questions I had on this topic. Update: making the code below thread safe by duplicating self on call. Note: as wldock and remi pointed out in the comments, it is important to change the headers["Content-Length"] value to reflect the new body length. See their comments for details.
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