how nginx handle connection with backend web server?

[李学鹏]

hi all
   i have a question that how nginx handle connection with backend web
server ?
   for example, i have a nginx server for receiving client request, and
reverse proxy to backend 2 web server(such as apache server), every apache
server have 100 child process(prefork module). so, if there are 1000 client
requests, how nginx map 1000 requests to only 200 apache server process?

thank you!
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