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Holger Just ce12e26bba Simplify the Rack middleware to write request log immediately
Previously, we would only setup a `::Rack::BodyProxy` to eventually log
the request once the response is deivered to the client. We did this
mainly in order to have a more "accurate" duration in the logs, similar
to what the `::Rack::CommonLogger` middleware does.

This has some significant disadvantages though:

* If an exception is raised by an outer middleware after we returned,
the response is never delivered and the log is lost.
* If a timeout occured (and e.g. a Unicorn worker is killed or a
`Rack::Timeout` stroke) before we return the full response, the log is
lost.
* If the client goes away before the request is finished, the app server
might decide no just throw away the response.

Besides addressing these issues, logging directly after the request
leaves our middleware scope makes the whole process much easier to
reason about.
2018-01-30 18:36:47 +01:00
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