解决了语音上传到问题，接下来要解决下载播放问题

Pods/Qiniu/QiniuSDK/Http/Dns/QNDnsPrefetch.h

@@ -0,0 +1,66 @@
+//
+//  QNDnsPrefetch.h
+//  QnDNS
+//
+//  Created by yangsen on 2020/3/26.
+//  Copyright © 2020 com.qiniu. All rights reserved.
+//
+
+#import "QNDns.h"
+#import "QNUpToken.h"
+#import "QNConfiguration.h"
+#import "QNTransactionManager.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+#define kQNDnsPrefetch [QNDnsPrefetch shared]
+@interface QNDnsPrefetch : NSObject
+
+/// 最近一次预取错误信息
+@property(nonatomic,  copy, readonly)NSString *lastPrefetchedErrorMessage;
+
++ (instancetype)shared;
+
+/// 根据host从缓存中读取DNS信息
+/// @param host 域名
+- (NSArray <id <QNIDnsNetworkAddress> > *)getInetAddressByHost:(NSString *)host;
+
+/// 通过安全的方式预取 dns
+- (NSString *)prefetchHostBySafeDns:(NSString *)host error:(NSError **)error;
+
+- (void)clearDnsCache:(NSError **)error;
+
+@end
+
+
+
+@interface QNTransactionManager(Dns)
+
+/// 添加加载本地dns事务
+- (void)addDnsLocalLoadTransaction;
+
+/// 添加检测并预取dns事务 如果未开启DNS 或 事务队列中存在token对应的事务未处理，则返回NO
+/// @param currentZone 当前区域
+/// @param token token信息
+- (BOOL)addDnsCheckAndPrefetchTransaction:(QNZone *)currentZone token:(QNUpToken *)token;
+- (BOOL)addDnsCheckAndPrefetchTransaction:(QNConfiguration *)config zone:(QNZone *)currentZone token:(QNUpToken *)token;
+
+/// 设置定时事务：检测已缓存DNS有效情况事务 无效会重新预取
+- (void)setDnsCheckWhetherCachedValidTransactionAction;
+
+@end
+
+#define kQNDnsSourceDoh @"doh"
+#define kQNDnsSourceUdp @"dns"
+#define kQNDnsSourceDnspod @"dnspod"
+#define kQNDnsSourceSystem @"system"
+#define kQNDnsSourceCustom @"customized"
+#define kQNDnsSourceNone @"none"
+
+BOOL kQNIsDnsSourceDoh(NSString * _Nullable source);
+BOOL kQNIsDnsSourceUdp(NSString * _Nullable source);
+BOOL kQNIsDnsSourceDnsPod(NSString * _Nullable source);
+BOOL kQNIsDnsSourceSystem(NSString * _Nullable source);
+BOOL kQNIsDnsSourceCustom(NSString * _Nullable source);
+
+NS_ASSUME_NONNULL_END