On Fri, Sep 30, 2016 at 9:24 AM, Grant <[email protected]> wrote: > > By default the Connection header is passed to the origin. If a client > sends > > a request with Connection: close, Nginx would send this to the upstream, > > effectively disabling keepalive. By clearing this header, Nginx will not > > send it on to the upstream source, leaving it to send its own Connection > > header as appropriate. > > > That makes perfect sense. Is there a way to test if keepalive is > active between nginx and the upstream server? > > - Grant >
A few quick thoughts come to mind: - tcpdump traffic between nginx and upstream (this seems like the best way to verify given that keepalive behavior directly affects tcp traffic, so you want to examine this directly) - examine nginx debug logs to show what headers are being passed to / received from upstream (requires your nginx to be built with --with-debug) - query kernel for status of tcp connections while simulating traffic between nginx and upstream (eg netstat, ss, etc)
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