connections in CLOSE_WAIT

[Dk Jack]

Could someone comment on my question below. What does it mean when the
connections are stuck in 'Writing' state? Since the client has received the
response, why is the nginx still stuck trying to write something. Any help
in debugging or what to look for is greatly appreciated. Thanks.

Dk.

On Tue, Jul 23, 2019 at 6:17 PM Dk Jack <dnj0496 at gmail.com> wrote:

> Hi,
> In my module, I am capturing the request body to check if the body
> contains some specific content. If the body does not contain the specific
> content, I pass on the request without modification. Otherwise, I send a
> HTTP_FORBIDDEN. I am using 'ngx_http_read_client_request_body' call to
> capture the body.  Everything seems to be working fine. My requests are
> forwarded to the orgin server and my client is receiving the response from
> the origin server correctly.
>
> However, what I notice is that the nginx is not releasing the client side
> (see below). Nginx status module reports same number of active connections
> in 'writing' state. Is there something special I need to do in my module to
> ensure the connections are closed properly when I am capturing body? Any
> help is greatly appreciated. Thanks.
>
> Regards,
> Dk.
>
> [centos at ip-10-50-18-73 nginx]$ netstat -n | grep CLOSE_WAIT | head -4
> tcp        1      0 10.50.18.73:443         10.50.30.239:60116
>  CLOSE_WAIT
> tcp        1      0 10.50.18.73:443         10.50.30.239:60092
>  CLOSE_WAIT
> tcp        1      0 10.50.18.73:443         10.50.30.239:60112
>  CLOSE_WAIT
> tcp        1      0 10.50.18.73:443         10.50.30.239:60054
>  CLOSE_WAIT
> [centos at ip-10-50-18-73 nginx]$ netstat -n | grep CLOSE_WAIT | wc -l
> 35
> [centos at ip-10-50-18-73 nginx]$ [centos at ip-10-50-18-73 nginx]$ curl -k
> https://localhost/nginx_status
> Active connections: 37
> server accepts handled requests
>  41 41 472
> Reading: 0 Writing: 36 Waiting: 1
> [centos at ip-10-50-18-73 nginx]$
>
>
>
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