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If you don't want to store the response of a GET request in the cache, wrap it in uncached(). It will neither read from nor write to cache.
uncached()
uncached(...)
Things to evaluate with caching off
Whatever ... returns.
uncached will not invalidate cache records, if present. It only ignores them.
uncached
# NOT RUN { uncached(GET("http://httpbin.org/get")) # }
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