GZip提升响应速度，减少文件的大小
gzip level （1~9）压缩比
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
manager.requestSerializer.timeoutInterval = 10;//请求超时
manager.requestSerializer.cachePolicy = NSURLRequestUseProtocolCachePolicy; //缓存策略
[manager.requestSerializer setValue:@"gzip" forHTTPHeaderField:@"Content-Encoding"];
[manager.requestSerializer setValue:@"gzip" forHTTPHeaderField:@"Accept-Content"];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json;charset=utf-8", @"text/json", @"text/javascript", @"text/plain",@"text/html",@"application/json", nil];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/json", @"text/plain", @"text/html", nil];
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对后台GZip返回的加密后的字符串进行解密
WechatIMG1.jpeg - 例子：(前端进行对数据用GZip加密然后再解密)
WechatIMG2.jpeg
GZip网络链接
