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Add Server Timing middleware by sebastians · Pull Request #36289 · rails/rails ·...
source link: https://github.com/rails/rails/pull/36289
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Summary
What is server timing?
It's a specification that defines how the server can communicate the
user agent performance metrics about the request it is responding to.
Here's the official specification: https://www.w3.org/TR/server-timing/
How does it work?
This introduces a new ServerTiming middleware only on development by
default, this is done using the config.server_timing setting.
It works by subscribing to all ActiveSupport::Notifications and adding
their duration to the Server-Timing header.
Why is this useful?
It makes looking at performance metrics in development much easier,
especially when using Chrome dev tools which include the metrics in the
Network Inspector. Here's an example:
Paired on this with @guilleiguaran
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