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Date: Tue, 12 Oct 2010 14:23:33 -0400 (EDT)
From: "Felix Berger (JIRA)" <jira@apache.org>
To: dev@hc.apache.org
Subject: [jira] Created: (HTTPCLIENT-1010) add an X-From-Cache header to
 responses that are served from the cache
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add an X-From-Cache header to responses that are served from the cache
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                 Key: HTTPCLIENT-1010
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1010
             Project: HttpComponents HttpClient
          Issue Type: New Feature
          Components: Cache
    Affects Versions: 4.1 Alpha2
            Reporter: Felix Berger
         Attachments: x-from-cache.patch

This allows the caller to find out if an actual connection has been made. One possible way of doing this is to add a custom header to resonses generated from the cache. The attached patch adds the header:

X-From-Cache: true

The use case where this is needed is when you want to know whether you are actually connected to the internet or whether contacted server is alive without generating extra out of order requests.

I was also looking if it was possible to detect this by looking at the Via header, but it looks like the same header is added whether the response is served from the backend or the local cache.

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