AlamoFire Ignore Cache-Control Headers

Question

Is it possible to ignore cache-control headers when performing a request/handling the response with AlamoFire?

Currently I am making a request as follows, and the server is returning large cache-control headers, when in fact we need to ignore them.

Alamofire.request(.GET, url).responseJSON { (_, _, result) in // Do something

I know the correct solution is to modify the server response, but this is not feasible at this time.

Also, there are other requests where I do want to honor the cache-control headers, so ideally I would a solution that does not involve changing a global configuration of AlamoFire.

Answer 1

To ignore the cached data, you need to set the cachePolicy on the NSURLRequest before using Alamofire to start it.

let URL = NSURL(string: "https://my_url_path...")!
let URLRequest = NSMutableURLRequest(URL: URL)
URLRequest.cachePolicy = .ReloadIgnoringCacheData

Alamofire.request(URLRequest)
    .response { response in
        print(response)
    }

Setting the cachePolicy on the URL request always overrides the value set on the NSURLSessionConfiguration.

By default, the NSURLSessionConfiguration cache policy is set to .UseProtocolCachePolicy which will honor the Cache-Control header values.