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From Sam Perman <...@permans.com>
Subject Re: CachingHttpClient with a custom HttpClient in 4.5
Date Tue, 05 Jan 2016 11:28:22 GMT
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.


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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