I would say “and nginx uses the fds (file descriptors) from the same
connect to the upstream backen” (wiki quote). But that should be 2, not
agree with you on this.
If any of the gurus out there could shed light on this, I’m sure a lot
So, if you have 2 per browser, it’s normal to have 4 in reverse proxy.
Basically, the reverse proxy uses one connection to the backend for each
connection to the browser. And since all connections come from the same
the 4 makes sense.
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since every browser opens 2 connections by default,
Finally we found both Outlook & Thunderbird uses 6 connections for 1
So the formula can be :
max_clients = worker_processes * worker_connections / 6
for mail proxy .
I don’t know if this should be described in the wiki page though…
Regarding max clients , I understand it’s normal to have 4 in reverse
since browser uses 2 connections in HTTP 1.1.
How about mail reverse proxy?
It seems POP command from telnet client uses 4 also, although I couldn’t
POP3 uses more than 1 connection in RFC 1939.