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From "Kalnichevski, Oleg" <oleg.kalnichev...@bearingpoint.com>
Subject RE: SSL Performance Problem
Date Thu, 03 Apr 2003 15:36:07 GMT
Stupid me ;-) Actually HttpClient uses 3000ms timeout when expecting 100 (CONTINUE) status
code. That has nothing to do with SSL and all my conspiracy theories.

As now 'expect: 100-continue' is disabled per default, HttpClient treats all 100 status codes
it receives as unexpected. This is perfectly ok. Some HTTP servers do send 100 (CONTINUE)
status code even if they are not asked to do so.

Are you using Jetty by any chance? 

Oleg

-----Original Message-----
From: André Augusto de Oliveira Aragão
[mailto:andre.augusto@ca.tco.net.br]
Sent: Donnerstag, 3. April 2003 17:24
To: 'Commons HttpClient Project'
Subject: RE: SSL Performance Problem


HI!

I got the latest nightly build. The times are no more constant, and the
performance is now ok. There is a new message in the log:
org.apache.commons.httpclient.HttpMethod - Discarding unexpected response:
HTTP/1.1 100 Continue

Why is it discarding? Is the server sending me this anyway, or the
httpclient is sending the header Expect 100: continue with my post data?

Best regards,

Andre

-----Original Message-----
From: Kalnichevski, Oleg [mailto:oleg.kalnichevski@bearingpoint.com]
Sent: quinta-feira, 3 de abril de 2003 12:14
To: Commons HttpClient Project
Subject: RE: SSL Performance Problem


Andre

Recently there has been an SSL vulnerability discovered related (very
roughly put) to the time it takes the server respond to an invalid
authentication request. For more details refer to

http://lasecwww.epfl.ch/memo_ssl.shtml

I would not be too surprised if newer SSL implementation developed some
pre-emptive measures against similar exploits by trying to equalize response
time. It's just a wild guess on my part. By no means being a security expert
I may be wrong about it.

Oleg


-----Original Message-----
From: André Augusto de Oliveira Aragão
[mailto:andre.augusto@ca.tco.net.br]
Sent: Donnerstag, 3. April 2003 16:55
To: 'Commons HttpClient Project'
Cc: 'becke@u.washington.edu'
Subject: RE: SSL Performance Problem


Thanks Michael,

I´m trying to send it again, this time as zip file. 

About the poor performance, I'm measuring time only after receiving the 100
server response, in the second step of the handshaking process. In the C++
version I have, I don´t know if it does or not the 100 handshaking - I don't
have the code. Anyway, it´s much faster, and I don´t believe it´s because
it´s implemented in java. The http version has similar times in the java and
C++ version. Can you point me a similar jsse implementation?

What about the constant times? It´s the weird thing. It takes the same time
in the first part of the negotiation, when it send the 100 header, and in
the second part - actually when the request is processed in the server. Any
explanations?

Regards,

Andre



-----Original Message-----
From: Michael Becke [mailto:becke@u.washington.edu]
Sent: quinta-feira, 3 de abril de 2003 11:39
To: Commons HttpClient Project
Subject: Re: SSL Performance Problem


Hello André,

Unfortunately it seems that the attachments were stipped from your 
message.  Jeff, Oleg do you have any idea how we can get this fixed?

I'm guessing the poor performance with SSL is due to the "Expect: 
100-continue" header.  Try calling setUseExpectHeader(false) on the post 
method.  I would also suggest using the latest code from CVS or a 
nightly build.

Mike

André Augusto de Oliveira Aragão wrote:
> HI!
> 
> I think httpclient is having a strange behavior. I´m developing a software
> that, among other things, must make performance measurements on web sites.
> 
> I have a site called https://callcenter.tco.net.br. This site uses, as you
> can see SSL. And I also have this site in a non ssl version -
> http://www.tco.net.br/col. 
> 
> When I try to measure performance in the https://callcenter.tco.net.br, I
> get always 3000 ms. I can run a dozen times, and I get it over and over
> (with the log turned off), with very small changes - about 4 ms. It´s very
> strange. This time is measured only in the second post interaction, ie, in
> the reply to the 100-continue server response.
> 
> When I use the non-ssl version, the time changes at each try, as expected.
> 
> Other problem is the performance. When I use the non-ssl version, the time
> changes from 800 ms to 1200 ms. Using the https, it´s always 3000 ms. I
have
> a similar function wrote in C++, and I get similar times using http or
> https. Well, https sometimes get to 1500 ms, but generally speaking, the
> degradation is not sensible.
> 
> I´m sending my code, and the log generated for both situations, using the
> https and the http site.
> 
> Another question: Why the httpclient always add the Expect: 100-continue
> header? Is it part of the http spec? As I know, it should not be used on
> "normal" situations, ie, when you have a small post to do to the server.
> Correct me If I´m wrong.
> 
> I´m using 2.0-alpha3-dev.
> 
> Thanks in advance,
> 
> Andre Augusto
> TCO Celular
> 
> 
> 
> 
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