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/QNUserAgent.m

@@ -0,0 +1,91 @@
+//
+//  QNUserAgent.m
+//  QiniuSDK
+//
+//  Created by bailong on 14-9-29.
+//  Copyright (c) 2014年 Qiniu. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+#import <MobileCoreServices/MobileCoreServices.h>
+#import <UIKit/UIKit.h>
+#else
+#import <CoreServices/CoreServices.h>
+#endif
+
+#import "QNUserAgent.h"
+#import "QNUtils.h"
+
+static NSString *qn_clientId(void) {
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+    NSString *s = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
+    if (s == nil) {
+        s = @"simulator";
+    }
+    return s;
+#else
+    long long now_timestamp = [[NSDate date] timeIntervalSince1970] * 1000;
+    int r = arc4random() % 1000;
+    return [NSString stringWithFormat:@"%lld%u", now_timestamp, r];
+#endif
+}
+
+static NSString *qn_userAgent(NSString *id, NSString *ak) {
+    NSString *addition = @"";
+#if DEBUG
+    addition = @"_Debug";
+#endif
+    
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+    return [NSString stringWithFormat:@"QiniuObject-C%@/%@ (%@; iOS %@; %@; %@)", addition, [QNUtils sdkVersion], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], id, ak];
+#else
+    return [NSString stringWithFormat:@"QiniuObject-C%@/%@ (Mac OS X %@; %@; %@)", addition, [QNUtils sdkVersion], [[NSProcessInfo processInfo] operatingSystemVersionString], id, ak];
+#endif
+}
+
+@interface QNUserAgent ()
+@property (nonatomic) NSString *ua;
+@end
+
+@implementation QNUserAgent
+
+- (NSString *)description {
+    return _ua;
+}
+
+- (instancetype)init {
+    if (self = [super init]) {
+        _id = qn_clientId();
+    }
+    return self;
+}
+
+/**
+ *  UserAgent
+ */
+- (NSString *)getUserAgent:(NSString *)access {
+    NSString *ak;
+    if (access == nil || access.length == 0) {
+        ak = @"-";
+    } else {
+        ak = access;
+    }
+    return qn_userAgent(_id, ak);
+}
+
+/**
+ *  单例
+ */
++ (instancetype)sharedInstance {
+    static QNUserAgent *sharedInstance = nil;
+
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [[self alloc] init];
+    });
+
+    return sharedInstance;
+}
+
+@end