NSLog("checking if it exists")
if FileManager.default.fileExists(atPath: ServerCache.path) {
    let now = Date()
    NSLog("reading the modification date")
    let modDate = try! FileManager.default.attributesOfItem(atPath: ServerCache.path)[.modificationDate] as! Date
    
    if modDate.distance(to: now) < ServerCache.expiry {
        NSLog("reading from the file")
        let cacheData = try! String.init(contentsOfFile: ServerCache.path, encoding: .utf8)
        NSLog("finished reading from file")
    }
}