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I noticed some caching issues with service calls when repeating the same service call (long polling). Adding metadata didn't help. One solution is to pass a timestamp to ensure ie thinks it's a different http service request. That worked for me, so adding a server side scripting code snippet to automatically update this tag wouldn't hurt:
@Anshul No, must-revalidate and no-cache have different meaning for fresh responses: If a cached response is fresh (i.e, the response hasn't expired), must-revalidate will make the proxy serve it right away without revalidating with the server, whereas with no-cache the proxy must revalidate the cached response regardless of freshness. Source: "HTTP - The Definitive Guide", pages 182-183.
Beware of ETag Even if you are using nocache, the ETag header isn't removed, because it works in a different way. It's generated at the end of the request and could be another source of unintended caching. In order to handle it you have two choices. app.set The first is disabling it using express builtin app.set('etag', false); method. on-headers The second is removing the header just before ...