RST on TCP level sent by Tomcat

[Arshiya Shariff <ar...@ericsson.com.INVALID>]

Hi Team,
Can you please help us with the below queries :

1. When does a http2 connection close ? We see that the keepAliveTimeout is 20 seconds by default, but it is not closing the connection on keepAliveTimeout.
2. How to keep the connections alive / How to enable ping frames to be sent to the other end to keep the connection alive ?

3. We see that RST is sent by tomcat on receiving http2 request, when does this happen ?
4. What are the recommended ipv4.tcp settings for these kind of scenarios ?

Embedded Tomcat         : 9.0.22
Java Version                     : 1.8.0.201
Hardware                          : Red Hat Enterprise Linux Server release 7.4

Thanks and Regards
Arshiya Shariff

Re: RST on TCP level sent by Tomcat

[Christopher Schultz <ch...@christopherschultz.net>]

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Arshiya,

On 5/18/20 05:42, Arshiya Shariff wrote:
> Hi Team, Can you please help us with the below queries :
>
> 1. When does a http2 connection close ? We see that the
> keepAliveTimeout is 20 seconds by default, but it is not closing
> the connection on keepAliveTimeout.

Can you describe the behavior you are seeing?

> 2. How to keep the connections alive / How to enable ping frames
> to be sent to the other end to keep the connection alive ?

Are you using h2 or websocket? h2 connections aren't expected to be
especially long-lived.

> 3. We see that RST is sent by tomcat on receiving http2 request,
> when does this happen ?

The first request after connect, or the first one after trying a second
(or third, etc.) request?

> 4. What are the recommended ipv4.tcp settings for these kind of
> scenarios ?

The default settings are fairly good for most people; perhaps the
timeouts could be reduced for a high-use production environment, but
this depends significantly on your usage patterns and goals.

- -chris
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