27 May '16, 7pm

Bitten by Rails’ “sane defaults”. If your app server is behind something that sets X-Request-Id header, watch out https://t.co/P3fZ9sVgbz

Makes a unique request id available to the action_dispatch.request_id env variable (which is then accessible through ActionDispatch::Request#uuid ) and sends the same id to the client via the X-Request-Id header. The unique request id is either based on the X-Request-Id header in the request, which would typically be generated by a firewall, load balancer, or the web server, or, if this header is not available, a random uuid. If the header is accepted from the outside world, we sanitize it to a max of 255 chars and alphanumeric and dashes only. The unique request id can be used to trace a request end-to-end and would typically end up being part of log files from multiple pieces of the stack.

Full article: http://api.rubyonrails.org/classes/ActionDispatch/Request...

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