Caching Digest Authentication Responses - httpclient

Question

I am using Apache's HttpClient to talk to a server that requires Digest Authentication.
I set up an HttpClientContext with credentials like so:
#Bean
public HttpClientContext getCredentialsHttpClientContext() {
HttpClientContext context = HttpClientContext.create();
context.setCredentialsProvider(createCredentialsProvider());
context.setAuthCache(new BasicAuthCache());
return context;
}
Later on I use this context to stream data from my server:
public InputStream getInputStreamFromUrl(String url) throws IOException {
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
HttpResponse httpResponse = httpClient.execute(new HttpGet(url), clientContext);
return httpResponse.getEntity().getContent();
}
Later on in processing this input stream, I need to make calls to the same server using the HttpClientContext, and every subsequent call requires authentication.
Is it possible to cache the results of the digest auth, so that subsequent requests don't need to be authenticated again?

Answer 1

#oleg's comments above pointed me in the right direction.
I actually create a singleton HttoClientContext bean:
#Bean
public HttpClientContext getCredentialsHttpClientContext() {
HttpClientContext context = HttpClientContext.create();
context.setCredentialsProvider(createCredentialsProvider());
context.setAuthCache(new BasicAuthCache());
return context;
}
I inject this into a service that I use in the getInputStreamFromUrl method above.
In other cases, I am using the RestOperations template. In order for this to work, I created the following Spring bean, creates a RestTemplate using the same HttpClientContext singelton:
#Bean
public RestOperations getIcsCredentialedRestOperations() {
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactoryWithContext(httpClient, httpClientContext);
return new RestTemplate(requestFactory);
}
In the above example, HttpComponentsClientHttpRequestFactory extends HttpComponentsClientHttpRequestFactory overriding the createHttpContext method returning the context that I want.