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List:       httpclient-users
Subject:    Re: Proper Use of HTTPClient 3.x for Many Hosts
From:       Oleg Kalnichevski <olegk () apache ! org>
Date:       2009-01-26 21:10:45
Message-ID: 497E26D5.4020905 () apache ! org
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PercyChris @ Hotmail wrote:
> Well That Java object (hostconfiguration) from which the new http client is
> build is of course also recreated with the parameters (host address etc.) of
> the new host. So the new HTTP client created has points to a different host
> 

You are not listening.

HTTP client can point at ANY host host. The default HostConfiguration 
will be used as default only if no host configuration is given to the 
HttpClient#execute method.

You can create AS MANY HostConfiguration instances as you please and 
pass them to each invocation of

http://hc.apache.org/httpclient-3.x/apidocs/org/apache/commons/httpclient/HttpClient.h \
tml#executeMethod(org.apache.commons.httpclient.HostConfiguration,%20org.apache.commons.httpclient.HttpMethod,%20org.apache.commons.httpclient.HttpState)


Hope this helps

Oleg


> -----Original Message-----
> From: Oleg Kalnichevski [mailto:olegk@apache.org] 
> Sent: maandag 26 januari 2009 20:31
> To: HttpClient User Discussion
> Subject: Re: Proper Use of HTTPClient 3.x for Many Hosts
> 
> PercyChris @ Hotmail wrote:
> > It does not. The hostconfiguration object is switched, multiple are
> > configured and are round robbed when an IOexception is detected.
> > 
> > 
> 
> Sorry. I do not understand.
> 
> Oleg
> 
> 
> > -----Original Message-----
> > From: joeweder [mailto:joeweder@gmail.com] 
> > Sent: maandag 26 januari 2009 15:22
> > To: httpclient-users@hc.apache.org
> > Subject: Re: Proper Use of HTTPClient 3.x for Many Hosts
> > 
> > 
> > Thanks Oleg! 
> > But I am confused; how can a single HttpClient instance work for many
> hosts
> > (e.g., http://abc.com, and https://xyz.com:3331) when it seems to have a
> > single instance of HostConfiguration?
> > 
> > 
> > 
> > olegk wrote:
> > > On Fri, 2009-01-23 at 11:45 -0800, joeweder wrote:
> > > > I have a application that will talk to several hosts (from 1 to 25). For
> > > > each
> > > > host, it will make repeated (timed interval) ongoing GETs and POSTs to a
> > > > few
> > > > ports.
> > > > 
> > > > QUESTION: What is the recommended usage of the
> > > > HttpClient/HttpConnectionManager for this scenario?
> > > > 
> > > > Do I use a single HttpConnectionManager for each host (20 hosts ==> 20
> > > > HCM)?
> > > > Or, can I reuse one HttpConnectionManager and talk to more than one host
> > > > (20
> > > > host ==> 1 HCM)?
> > > > 
> > > Yes, you can (and should) reuse one connection manager. 
> > > 
> > > 
> > > > I am reasonably certain that I need to use the
> > > > MultiThreadedHttpConnectionManager.
> > > > What I think is that I'd create one connection manager and create a
> > > > single
> > > > HttpClient instance for each host/port combination... like below:
> > > > 
> > > > HttpConnectionManager      HttpClientHost1Port3331
> > > > HttpClientHost1Port8080
> > > > HttpClientHost2Port3331
> > > > HttpClientHost2Port8080
> > > > ...
> > > > 
> > > > Agree/Disagree?
> > > > 
> > > This will not result in any tangle benefit I can think of. A single
> > > HttpClient instance should be perfectly okay.
> > > 
> > > > 
> > > > I see lots of posts about this but I am not 100% sure about the answer
> > > > for
> > > > my scenario.
> > > > Thanks for any feedback in advance. 
> > > > 
> > > > NOTE: I want to solve this with 3.x and then move to 4.x
> > > 4.0 has a massively better connection management. If you plan to migrate
> > > soon, skip 3.x altogether.
> > > 
> > > Oleg
> > > 
> > > 
> > > 
> > > 
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: httpclient-users-unsubscribe@hc.apache.org
> > > For additional commands, e-mail: httpclient-users-help@hc.apache.org
> > > 
> > > 
> > > 
> 
> 
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> 


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