504 gateway timeouts

[Wade Girard]

Hi Peter,

Thank You.

In my servlet I am making https requests to third party vendors to get data
from them. The requests typically take 4~5 seconds, but every now any then
one of the requests will take more than 60 seconds. So the connection from
the client to nginx to tomcat will remain open, and at 60 seconds nginx is
terminating the request to tomcat, even though the connection from the
third party server to tomcat is still open.

I am also working with the third party vendor to have them see why their
connections sometimes take more than 60 seconds.

Through googling I discovered that adding the settings proxy_send_timeout,
proxy_read_timeout, proxy_connection_timeout, etc... to my location
definition in my conf file could change the timeout to be different
(higher) than the apparent default 60 second timeout. I use a Mac for
development. I added these to my local conf file, and added the long
connection request to test if the settings worked. They did. However they
do not have the same effect for nginx installed on my production Ubuntu
16.x servers. I did not realize that these settings were limited by the OS
that nginx is installed on. Are there are similar settings that will work
for the Ubuntu 16.x OS to achieve the same result?

Wade

On Fri, Jan 5, 2018 at 1:33 AM, Peter Booth <peter_booth at me.com> wrote:

> Wade,
>
> I think that you are asking “hey why isn’t nginx behaving identically on
> MacOS and Linux when create a servlet that invokes Thread.sleep(300000)
> before it returns a response?*.”*
>
> Am I reading you correctly?
>
> A flippant response would be to say: “because OS/X and Linux are different
> OSes that behave differently”
>
> It would probably help us if you explained a little more about your test,
> why the sleep is there and what your goals are?
>
>
> Peter
>
>
> On Jan 4, 2018, at 11:45 PM, Wade Girard <wade.girard at gmail.com> wrote:
>
> I am not sure what is meant by this or what action you are asking me to
> take. The settings, when added to nginx conf file on Mac OS server and
> nginx reloaded take effect immediately and work as expected, the same
> settings when added to nginx conf file on Ubuntu and nginx reloaded have no
> effect at all. What steps can I take to have the proxy in nginx honor these
> timeouts, or what other settings/actions can I take to make this work?
>
> Thanks
>
> On Thu, Jan 4, 2018 at 7:46 PM, Zhang Chao <zchao1995 at gmail.com> wrote:
>
>> > The version that is on the ubuntu servers was 1.10.xx. I just updated
>> it to
>> >
>> > nginx version: nginx/1.13.8
>> >
>> > And I am still having the same issue.
>> >
>> > How do I "Try to flush out some output early on so that nginx will know
>> that Tomcat is alive."
>> >
>> > The nginx and tomcat connection is working fine for all
>> requests/responses that take less t
>>
>> Maybe you can flush out the HTTP response headers quickly.
>>
>>
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>
>
>
> --
> Wade Girard
> c: 612.363.0902 <(612)%20363-0902>
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>
>
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>



-- 
Wade Girard
c: 612.363.0902
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