How to disable caching from NSURLSessionTask

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If your read the links from @runmad you can see in the flow chart that if the HEAD of the file is unchanged it will still used the cached version when you set the cachePolicy.

In Swift3 I had to do this to get it to work:

let config = URLSessionConfiguration.default
config.requestCachePolicy = .reloadIgnoringLocalCacheData
config.urlCache = nil

let session = URLSession(configuration: config)

That got a truly non-cached version of the file, which I needed for bandwidth estimation calculations.

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