On Thu, 2015-04-23 at 16:45 +0000, Mark A. Claassen wrote:
> I found some information on proxy failover and HttpClient, but not much. I
> was wondering, though, if my approach is OK. I realize there are
> inefficiencies, but before I go there, I want to know if I am even on the
> right track.
>
> I extended DefautRoutePlanner and implemented the determineProxy method.
> In that method I get the list of potential proxies and then test them. I
> return the first one in the list that works. (Also, when I find one that
> works, I remember it so I don't need to test it again.)
>
> In my constructor for my route planner, I create a separate HttpClient
> instance that just uses the DefaultRoutePlanner, which returns NULL for
> determineProxy().
>
> Has anyone done anything like this?
>
> Thanks,
> Mark
>
>
>
> private boolean testProxy(URI targetURI, Proxy proxy) {
> boolean rval;
> if (proxy.type() != Proxy.Type.DIRECT) {
> InetSocketAddress address = (InetSocketAddress)
> proxy.address();
> HttpHost host = new
> HttpHost(address.getHostName(), address.getPort(),
> ApacheNetworkImpl.SCHEME_HTTP);
>
> try {
> URI uri = new URI(host.toURI());
> RequestBuilder rb =
> RequestBuilder.get(uri);
> HttpUriRequest request = rb.build();
> try {
> HttpResponse resp =
> testClient.execute(request);
> rval = true;
> }
> catch (IOException ex) {
> rval = false;
> connectFailed(targetURI,
> address, ex);
> }
> finally {
> request.abort();
> }
> }
> catch (URISyntaxException ex) {
> rval = false;
> }
> }
> else
> rval = true;
> return rval;
> }
>
Mark,
There is a JIRA for similar feature request
https://issues.apache.org/jira/browse/HTTPCLIENT-1176
It should be possible to come with a more efficient solution by using a
custom HttpRequestRetryHandler in additional to a custom RoutePlanner.
Hope this helps
Oleg
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