Calculating the max. clients by worker_connections

[Ryan Chan]

In the wiki (http://wiki.nginx.org/EventsModule#worker_connections), it said:

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The worker_connections and worker_proceses from the main section
allows you to calculate maxclients value:

max_clients = worker_processes * worker_connections

In a reverse proxy situation, max_clients becomes

max_clients = worker_processes * worker_connections/4

Since a browser opens 2 connections by default to a serve...
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Why only in reverse proxy mode, the max clients is it divided by 4,
but not divided by 2 as normal web server?