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https://issues.apache.org/jira/browse/HTTPCLIENT-1487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940315#comment-13940315
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Oleg Kalnichevski commented on HTTPCLIENT-1487:
-----------------------------------------------

@Chris 
In default configuration caching HttpClient deletes cache entries in disk when 
shut down. I personally do not think this is unreasonable. 
{code:java}
CacheConfig config = CacheConfig.DEFAULT;
CloseableHttpClient client = CachingHttpClients.custom()
    .setCacheConfig(config)
    .setCacheDir(new File("my-cache"))
    .build();
{code}

One can override the default behavior by managing cache storage manually.
{code:java}
CacheConfig config = CacheConfig.DEFAULT;
FileResourceFactory resourceFactory = new FileResourceFactory(new 
File("my-cache"));
ManagedHttpCacheStorage cacheStorage = new ManagedHttpCacheStorage(config);
CloseableHttpClient client = CachingHttpClients.custom()
        .setCacheConfig(config)
        .setResourceFactory(resourceFactory)
        .setHttpCacheStorage(cacheStorage)
        .build();

// This will not affect cache storage
client.close();
// use #cleanResources instead of #close to preserve valid cache entries
cacheStorage.cleanResources();
//cacheStorage.close();    
{code}

Oleg

> CachingHttpClient doesn't persist cache
> ---------------------------------------
>
>                 Key: HTTPCLIENT-1487
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1487
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>            Reporter: Chris Oliver
>            Assignee: Jon Moore
>            Priority: Blocker
>
> Unless I'm mistaken, the current implementation doesn't maintain the cache 
> between executions of the java process. In addition, it appears the current 
> api for HttpCacheStorage makes it difficult / error prone to do this myself, 
> since my implementation would have to somehow produce an HttpCacheEntry. Any 
> suggestions?



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