On Thu, 2010-10-21 at 17:04 -0400, Greg Lindholm wrote:
> A service we use has suggested to us that if a HTTP request to them
> fails (for whatever reason) that we should retry the request using one
> of the other IP addresses that DNS returns.
>
> I traced through HttpClient 3.0 (I haven't upgraded yet) and see how
> the Socket Factory is using the standard Socket() constructor with the
> host name which internally uses InetAddress.getByName(hostname) which
> internally does a
>
> public static InetAddress getByName(String host)
> throws UnknownHostException {
> return InetAddress.getAllByName(host)[0];
> }
>
> So it will retrieve all the IP addresses for the host and then always
> use the first one.
>
> Question 1) Does the new HttpClient have any facility to retry a
> failed request on the next IP address?
>
> if Q1 is NO then:
>
> Question 2) How would I go about providing this facility? Can I
> provide a custom Socket Factory? Any suggestions? (I am not an expert
> on HttpClient so please provide enough details for a newbie to follow
> along.)
>
> I can figure out how to construct a Socket using a InetAdrress
> (instead of a hostname) and deal with round-robin thru the IP
> addresses. The thing I need help on is how to hook this into
> HttpClient.
>
> Thanks
>
> Greg
>
Greg
Versions 4.0.3 and 4.1-alpha2 provide support for multihome hosts out of
the box. HttpClient uses a simple round-robin algorithm per default, but
one can implement a more complex logic with the new API available in
HttpClient 4.1
Hope this helps
Oleg
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