ios - Alamofire/NSURLSession 缓存与私有(private)缓存控制和 max-age

Question

我不确定我是否做错了什么，但是设置 urlRequest.cachePolicy = .useProtocolCachePolicy 时缓存不起作用并将缓存 header 设置为 private with max-age "Cache-Control" = "private, max-age=86400";

useProtocolCachePolicy 应该与 private 一起使用吗？或者我需要手动将其覆盖为公共(public)？

Answer 1

我尝试了以下对我来说效果很好的代码，使用缓存策略:NSURLRequestUseProtocolCachePolicy。

它根据http头响应中的cache-control/max-age使缓存过期:

我用了这个有用的blog

这是我使用的代码:

NSURL * url = [NSURL URLWithString:@"https://yourserver.com"];

NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url
        cachePolicy:NSURLRequestUseProtocolCachePolicy
        timeoutInterval:60.0
    ];

    if (self.session == nil) {
        NSURLSessionConfiguration * config = [NSURLSessionConfiguration defaultSessionConfiguration];
        self.session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:NSOperationQueue.mainQueue];
    }
    NSURLSessionDataTask *task = [self.session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

        if (error != nil) {
            NSLog(@"task transport error %@ / %d", error.domain, (int) error.code);
            return;
        }

        NSHTTPURLResponse * httpResponse = (NSHTTPURLResponse*) response;
        NSLog(@"task finished with status %d, bytes %zu", (int) httpResponse.statusCode, (size_t) data.length);

        NSDictionary * headers = httpResponse.allHeaderFields;
        NSLog(@"response-headers %@",headers);
    }];

    [task resume];