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server.max-connections option

Provides fine tuning for request handling.

max-connections == max-fds/2 (maybe /3)

As in, if you want to support 2048 concurrent connections, you may also want to set server.max-fds = 4096 (or 6144).
Why more file handles than connections? The other file handles are used for fastcgi and/or files.

Default:

server.max-connections = 1024