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https://github.com/apache/cordova-ios/blob/b06ca8db4288f47e99f32294080106884e236d47/CordovaLib/Classes/CDVURLProtocol.m#L217-L220
Init using: https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSHTTPURLResponse_Class/index.html#//apple_ref/occ/instm/NSHTTPURLResponse/initWithURL:statusCode:HTTPVersion:headerFields: