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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 09:58:44 GMT
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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