.net - How to clear the cache of HttpWebRequest

Question

I am developing against a proprietary library and I'm experiencing some issues with the cache of the HttpWebRequest. The library is using code equivalent to the one below to make the requests:

var request = WebRequest.Create("http://example.com/") as HttpWebRequest;

request.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.CacheIfAvailable);

The external resource doesn't disallow caching although each response differs. Thus I am ending up getting the same response each time.

Is there any way to clear the contents of the HttpWebRequest cache? The right solution would be to fix the external source or perhaps change the cache policy, but neither is possible - hence the question.

Clearing the cache could have various impacts, so preferably the solution would be to invalidate the cache on a per resource basis.

Answer 1

public static WebResponse GetResponseNoCache(Uri uri)
{
        // Set a default policy level for the "http:" and "https" schemes.
        HttpRequestCachePolicy policy = new HttpRequestCachePolicy(HttpRequestCacheLevel.Default);
        HttpWebRequest.DefaultCachePolicy = policy;
        // Create the request.
        WebRequest request = WebRequest.Create(uri);
        // Define a cache policy for this request only. 
        HttpRequestCachePolicy noCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
        request.CachePolicy = noCachePolicy;
        WebResponse response = request.GetResponse();
        Console.WriteLine("IsFromCache? {0}", response.IsFromCache);            
        return response;
}

You can set the Cache Policy to the request to NoCacheNoStore to the HttpWebRequest.