Guard against nil response headers in cache invalidation#143
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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Fixes #142. When an upstream request fails in a way that yields a response with nil headers (timeout, TCP reset),
deleteraisedNoMethodError: undefined method '[]' for nilwhile looking up the Location and Content-Location headers, and that bubbled out of the on_complete callback instead of just invalidating the request url.This skips the header lookup when headers are nil and still deletes the cache entry for the request url. Added a spec that drives delete with a headerless response.