proxy_pass and concurrent connections

[Maxim Dounin]

Hello!

On Wed, Feb 28, 2018 at 11:52:18AM +0100, Дилян Палаузов wrote:

> when I try to enter a bug at 
> https://trac.nginx.org/nginx/newticket#ticket, choose as version 
> 1.12.x and submit the system rejects the ticket with the 
> message:
> 
> Warning: The ticket field 'nginx_version' is invalid: 
> nginx_version is required

That's about the "nginx -V" field you've left blank.

> And here is the actual question:
> 
> proxy_pass can accept an URL or a server group. When a server 
> group (upstream) is defined, then with max_conns= the maximum 
> number of simultaneous connections can be specified.
> 
> The documentation of proxy_pass shall clarify, whether by 
> default with URL only consequent connections are allowed/whether 
> defining upstream is the only way to introduce parallelism 
> towards the proxy.

Or not, bacause the answer is obvious unless you have very strange 
background.  Moreover, the documentation explicitly explains the 
default for "max_conns", so this should be obvious regardless of 
the background:

: max_conns=number
: limits the maximum number of simultaneous active connections to 
: the proxied server (1.11.5). Default value is zero, meaning there 
: is no limit.

If you for some reason think that only consequent connections are 
allowed, most likely you are facing limitations of your backend.

-- 
Maxim Dounin
http://mdounin.ru/