Document environment variable.

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Mathias Gug 2016-05-18 10:56:25 -07:00 committed by Patrick Niklaus
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## Environent Variables
### SIGNAL_PARENT_WHEN_READY
If the SIGNAL_PARENT_WHEN_READY environment variable is set osrm-routed will
send the USR1 signal to its parent when it will be running and waiting for
requests. This could be used to upgrade osrm-routed to a new binary on the fly
without any service downtime - no incoming requests will be lost.
## HTTP API
`osrm-routed` supports only `GET` requests of the form. If you your response size