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From DhilliPrasad Nellepalli <>
Subject Re: [users@httpd] Increasing packet size to 64 KB on mod_proxy and mod_proxy_balancer
Date Wed, 20 Sep 2017 00:54:30 GMT
Thanka Yann.

We don't use the ssl from apache to netty. One thing I have notice was
expect:100-Continue header in the request to apache. Not sure if except
header has anything to do with the fragmentation to send the headers first
and wait for response and then send the body.


On Sep 16, 2017 3:39 PM, "Yann Ylavic" <> wrote:

Hi Dhilli,

On Fri, Sep 15, 2017 at 3:44 PM, DhilliPrasad Nellepalli
<> wrote:
> We see high latency when the headers go above 8 KB. to debug the issue we
> have monitored the traffic from apache to netty with wireshark.
> We noticed that apache is sending request in multiple packets to netty.
> is adding latency in processing the request.

mod_prox_http sends the HTTP header (all the headers) in a one go,
although some filters in the chain may "fragment" it (like mod_ssl,
but that'd be 16K packets per TLS record size max).

> Is there a way to increase the packet size to higher value like 64 KB in
> mod_proxy. I know this can be achieved with modJK and AJP. But I don't
> believe netty supports AJP.
> We are running out of options in solving the issue.

It looks more like a limit on the system, TCP (send) buffers size?
This is not something that can be forced on the mod_proxy side (no
ProxySendBufferSize similar to SendBufferSize for the client
connection), but it can be tuned by default on the system.


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