Apache Proxy data delay question

Hello,

I already tried that question two weeks ago and till now got no answer.
Either nobody can help me (which would be bad) or it was overlooked, so I
try once again.

I have a general problem with proxy redirects on one of my servers and I'm
out of helpful documentation to solve the issue. The described situation
is no a single setup, but I try to find a general solution for this topic.
I was one of the authors of NTRIP 2.0 standard and I search a way to say
- "here, that's the way to have secure data transfer", so we don't need to
extend the standard to do so and
- "use this to allow NTRIP on port 80 where also you webserver is
running".

Situation:

- There is an NTRIP-Caster (this is a special purpose HTTP server) running
on port 2101 of the machine.
- On Port 80 (and 443 for HTTPS) is an Apache.

The Apache now should pass request to a virtual domain through to the local
2101 port and deliver results. It also should do the HTTPS encryption.
Generally this all works, but the delays are much to high for real-time data.

NTRIP is a system which has usually very low data rates but requires low
latency.

I use following configuration:


ServerName xxx

Order deny,allow
Allow from all

ProxyPass / http://xxx:2101/ flushpackets=on
ProxyIOBufferSize 128
ProxyReceiveBufferSize 512


ServerName xxx
SSLEngine on
...

Order deny,allow
Allow from all

ProxyPass / http://xxx:2101/ flushpackets=on
ProxyIOBufferSize 128
ProxyReceiveBufferSize 512


According docs flushpackets=on should cause immediate flusing and also the
reduced buffers should help, but still I have several seconds delay in the data
which is to much. Delays in the range of 1 or 2 seconds would be the maximum I
can accept.

I can change the source code of the NTRIP-Server, so additional header lines
speeding up the transfer would be possible. The server sends data in chunked
transfer mode and sends on TCP-packet for each chunk.

Any helpful hint would be greatly appreciated. Or suggestion where to get
the help I need when nobody can help me here.

Ciao
--
http://www.dstoecker.eu/ (PGP key available)


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Re: Apache Proxy data delay question

> Any helpful hint would be greatly appreciated. Or suggestion where to get
> the help I need when nobody can help me here.

What versions of Apache and Linux are you running? What are the SSL
options you've replaced with '...' in the snippet you posted? Is it
only using SSL that you see delays? Do you have a SSLRandomSeed
directive?

Cheers,
Phil.

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