The delay has become unstable recently.
Time: 14:00-16:00 UTC everyday
Location: China
The delay of APNs's response: The elapse from sending a notification to APNs Server to receiving a response from it.
Normal delay: 500ms
High delay: 10s-700s
Through put: 50/s
Description: One of my servers' delay is very high (even up to 700 seconds), but another server's delay just slightly increase.
Even though the delay is very high, the majority of responses are successful.
Restarting my push service is useless
extra_six
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I don't know which certificate to use for encryption.
Does the APP client need to install a specific private key?
There is a PayloadUUID key for com.apple.webcontent-filter.