ntf server: concurrent APNS push via sendRequestDirect#1780
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The per-(srvHost, provider) worker shards added in #1779 still funnel all APNS sends through one HTTP2Client's reqQ, where a single process thread calls sendRequest serially - one in-flight HTTP/2 stream at a time, capping APNS throughput at 1/RTT. sendRequestDirect bypasses the queue and invokes sendReq directly from the calling worker, so concurrent workers open parallel HTTP/2 streams on the shared APNS connection and the multiplexing happens on the wire.
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