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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: CachingHttpClient with a custom HttpClient in 4.5
Date Tue, 05 Jan 2016 12:00:55 GMT
On Tue, 2016-01-05 at 06:28 -0500, Sam Perman wrote:
> Maybe there is another way to implement what I'm trying to do? In my case, if the backend
request fails, I want to retry the request against a different url, but still cache the response.

> 

Why do you need a special client for that?

Oleg

> thanks
> Sam
> 
> > On Jan 5, 2016, at 4:58 AM, Oleg Kalnichevski <olegk@apache.org> wrote:
> > 
> >> On Mon, 2016-01-04 at 17:21 -0500, Sam Perman wrote:
> >> Hello
> >> 
> >> I'm using the CachingHttpClient in a way that is deprecated in 4.5 and am
> >> trying to figure out the right non-deprecated way to do this.
> >> 
> >> In my cause, I have a custom implementation of HttpClient that will do some
> >> request rewriting and retrying if it sees certain error conditions.
> >> 
> >> This is what the old deprecated code looks like:
> >> 
> >>        CacheConfig config = buildCacheConfig();
> >>        HttpClient myBackendClient = new CustomHttpClient();
> >>        CachingHttpClient cachingHttpClient = new
> >> CachingHttpClient(myBackendClient, config);
> >> 
> >> It looks like the recommended way to build caching http clients in 4.5 is
> >> to use the CachingHttpClientBuilder, but I see no way to provide my own
> >> implementation of HttpClient for use as the backend. Is this possible to do
> >> in a non deprecated way?
> > 
> > Sam,
> > You can't. The problem is that caching logic needs to be inserted at a
> > particular point in the protocol processing chain in order to work
> > correctly in all cases. The approach of adding a caching layer as a
> > decorator for an arbitrary HttpClient instance turned out to be not good
> > enough.
> > 
> > Oleg
> > 
> > 
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> 
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