nsurlcache

问题 Does NSURLCache transparently handle ETags received by server? I mean: does it automatically store ETags for each URL request and then send the appropriate If-None-Match when a request to the same URL is submitted? Or do I have to manage it by myself? 回答1: yes it does handle it transparently if you set its cache mode: NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString] cachePolicy: NSURLRequestUseProtocolCachePolicy timeoutInterval:60]; note: you