diff --git a/QiniuSDK/Http/QNHttpManager.h b/QiniuSDK/Http/QNHttpManager.h
index 3b45be74..9ecf4752 100644
--- a/QiniuSDK/Http/QNHttpManager.h
+++ b/QiniuSDK/Http/QNHttpManager.h
@@ -9,9 +9,12 @@
 #import <Foundation/Foundation.h>
 #import "QNhttpDelegate.h"
 
+#import "QNConfiguration.h"
+
 @interface QNHttpManager : NSObject <QNHttpDelegate>
 
-- (instancetype)initWithTimeout:(UInt32)timeout;
+- (instancetype)initWithTimeout:(UInt32)timeout
+                   urlConverter:(QNUrlConvert)converter;
 
 - (void)multipartPost:(NSString *)url
              withData:(NSData *)data
diff --git a/QiniuSDK/Http/QNHttpManager.m b/QiniuSDK/Http/QNHttpManager.m
index 701756ca..e3303fd0 100644
--- a/QiniuSDK/Http/QNHttpManager.m
+++ b/QiniuSDK/Http/QNHttpManager.m
@@ -16,22 +16,25 @@
 @interface QNHttpManager ()
 @property (nonatomic) AFHTTPRequestOperationManager *httpManager;
 @property UInt32 timeout;
+@property (nonatomic, strong) QNUrlConvert converter;
 @end
 
 @implementation QNHttpManager
 
-- (instancetype)initWithTimeout:(UInt32)timeout {
+- (instancetype)initWithTimeout:(UInt32)timeout
+                   urlConverter:(QNUrlConvert)converter {
 	if (self = [super init]) {
 		_httpManager = [[AFHTTPRequestOperationManager alloc] init];
 		_httpManager.responseSerializer = [AFJSONResponseSerializer serializer];
 		_timeout = timeout;
+		_converter = converter;
 	}
 
 	return self;
 }
 
 - (instancetype)init {
-	return [self initWithTimeout:60];
+	return [self initWithTimeout:60 urlConverter:nil];
 }
 
 + (QNResponseInfo *)buildResponseInfo:(AFHTTPRequestOperation *)operation
@@ -102,6 +105,9 @@ - (void)multipartPost:(NSString *)url
     withCompleteBlock:(QNCompleteBlock)completeBlock
     withProgressBlock:(QNInternalProgressBlock)progressBlock
       withCancelBlock:(QNCancelBlock)cancelBlock {
+	if (_converter != nil) {
+		url = _converter(url);
+	}
 	NSMutableURLRequest *request = [_httpManager.requestSerializer
 	                                multipartFormRequestWithMethod:@"POST"
 	                                                     URLString:url
@@ -123,6 +129,10 @@ - (void)         post:(NSString *)url
     withCompleteBlock:(QNCompleteBlock)completeBlock
     withProgressBlock:(QNInternalProgressBlock)progressBlock
       withCancelBlock:(QNCancelBlock)cancelBlock {
+	if (_converter != nil) {
+		url = _converter(url);
+	}
+
 	NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[[NSURL alloc] initWithString:url]];
 	if (headers) {
 		[request setAllHTTPHeaderFields:headers];
diff --git a/QiniuSDK/Http/QNSessionManager.h b/QiniuSDK/Http/QNSessionManager.h
index 689c8e60..0127e918 100644
--- a/QiniuSDK/Http/QNSessionManager.h
+++ b/QiniuSDK/Http/QNSessionManager.h
@@ -1,12 +1,15 @@
 #import <Foundation/Foundation.h>
 #import "QNHttpDelegate.h"
 
+#import "QNConfiguration.h"
+
 #if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090)
 
 @interface QNSessionManager : NSObject <QNHttpDelegate>
 
 - (instancetype)initWithProxy:(NSDictionary *)proxyDict
-                      timeout:(UInt32)timeout;
+                      timeout:(UInt32)timeout
+                 urlConverter:(QNUrlConvert)converter;
 
 - (void)multipartPost:(NSString *)url
              withData:(NSData *)data
diff --git a/QiniuSDK/Http/QNSessionManager.m b/QiniuSDK/Http/QNSessionManager.m
index ad2a10a1..79f656ae 100644
--- a/QiniuSDK/Http/QNSessionManager.m
+++ b/QiniuSDK/Http/QNSessionManager.m
@@ -54,18 +54,14 @@ - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(N
 @interface QNSessionManager ()
 @property (nonatomic) AFHTTPSessionManager *httpManager;
 @property UInt32 timeout;
+@property (nonatomic, strong) QNUrlConvert converter;
 @end
 
-static NSString *userAgent = nil;
-
 @implementation QNSessionManager
 
-+ (void)initialize {
-	userAgent = QNUserAgent();
-}
-
 - (instancetype)initWithProxy:(NSDictionary *)proxyDict
-                      timeout:(UInt32)timeout {
+                      timeout:(UInt32)timeout
+                 urlConverter:(QNUrlConvert)converter {
 	if (self = [super init]) {
 		NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
 		if (proxyDict != nil) {
@@ -74,13 +70,14 @@ - (instancetype)initWithProxy:(NSDictionary *)proxyDict
 		_httpManager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:configuration];
 		_httpManager.responseSerializer = [AFHTTPResponseSerializer serializer];
 		_timeout = timeout;
+		_converter = converter;
 	}
 
 	return self;
 }
 
 - (instancetype)init {
-	return [self initWithProxy:nil timeout:60];
+	return [self initWithProxy:nil timeout:60 urlConverter:nil];
 }
 
 + (QNResponseInfo *)buildResponseInfo:(NSHTTPURLResponse *)response
@@ -153,7 +150,7 @@ - (void)  sendRequest:(NSMutableURLRequest *)request
 
 	[request setTimeoutInterval:_timeout];
 
-	[request setValue:userAgent forHTTPHeaderField:@"User-Agent"];
+	[request setValue:QNUserAgent() forHTTPHeaderField:@"User-Agent"];
 	[request setValue:nil forHTTPHeaderField:@"Accept-Language"];
 	[uploadTask resume];
 }
@@ -166,6 +163,10 @@ - (void)multipartPost:(NSString *)url
     withCompleteBlock:(QNCompleteBlock)completeBlock
     withProgressBlock:(QNInternalProgressBlock)progressBlock
       withCancelBlock:(QNCancelBlock)cancelBlock {
+	if (_converter != nil) {
+		url = _converter(url);
+	}
+
 	NSMutableURLRequest *request = [_httpManager.requestSerializer
 	                                multipartFormRequestWithMethod:@"POST"
 	                                                     URLString:url
@@ -187,6 +188,10 @@ - (void)         post:(NSString *)url
     withCompleteBlock:(QNCompleteBlock)completeBlock
     withProgressBlock:(QNInternalProgressBlock)progressBlock
       withCancelBlock:(QNCancelBlock)cancelBlock {
+	if (_converter != nil) {
+		url = _converter(url);
+	}
+
 	NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[[NSURL alloc] initWithString:url]];
 	if (headers) {
 		[request setAllHTTPHeaderFields:headers];
diff --git a/QiniuSDK/Http/QNUserAgent.m b/QiniuSDK/Http/QNUserAgent.m
index 527d5d92..263b6fed 100644
--- a/QiniuSDK/Http/QNUserAgent.m
+++ b/QiniuSDK/Http/QNUserAgent.m
@@ -24,9 +24,14 @@
 }
 
 NSString *QNUserAgent(void) {
+	static NSString *ua = nil;
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
 #if __IPHONE_OS_VERSION_MIN_REQUIRED
-	return [NSString stringWithFormat:@"QiniuObject-C/%@ (%@; iOS %@; %@)", kQiniuVersion, [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], clientId()];
+		ua =  [NSString stringWithFormat:@"QiniuObject-C/%@ (%@; iOS %@; %@)", kQiniuVersion, [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], clientId()];
 #else
-	return [NSString stringWithFormat:@"QiniuObject-C/%@ (Mac OS X %@; %@)", kQiniuVersion, [[NSProcessInfo processInfo] operatingSystemVersionString], clientId()];
+		ua = [NSString stringWithFormat:@"QiniuObject-C/%@ (Mac OS X %@; %@)", kQiniuVersion, [[NSProcessInfo processInfo] operatingSystemVersionString], clientId()];
 #endif
+	});
+	return ua;
 }
diff --git a/QiniuSDK/Storage/QNConfiguration.h b/QiniuSDK/Storage/QNConfiguration.h
index 9eccef43..c467535c 100644
--- a/QiniuSDK/Storage/QNConfiguration.h
+++ b/QiniuSDK/Storage/QNConfiguration.h
@@ -15,6 +15,14 @@
  */
 extern const UInt32 kQNBlockSize;
 
+/**
+ *    转换为用户需要的url
+ *
+ *    @param url  上传url
+ *
+ *    @return 根据上传url算出代理url
+ */
+typedef NSString *(^QNUrlConvert)(NSString *url);
 
 @class QNConfigurationBuilder;
 
@@ -63,13 +71,14 @@ typedef void (^QNConfigurationBuilderBlock)(QNConfigurationBuilder *builder);
  */
 @property (readonly) UInt32 timeoutInterval;
 
-
 @property (nonatomic, readonly) id <QNRecorderDelegate> recorder;
 
 @property (nonatomic, readonly) QNRecorderKeyGenerator recorderKeyGen;
 
 @property (nonatomic, readonly)  NSDictionary *proxy;
 
+@property (nonatomic, readonly) QNUrlConvert converter;
+
 + (instancetype)build:(QNConfigurationBuilderBlock)block;
 
 @end
@@ -155,5 +164,6 @@ typedef void (^QNConfigurationBuilderBlock)(QNConfigurationBuilder *builder);
 
 @property (nonatomic, assign)  NSDictionary *proxy;
 
+@property (nonatomic, assign) QNUrlConvert converter;
 
 @end
diff --git a/QiniuSDK/Storage/QNConfiguration.m b/QiniuSDK/Storage/QNConfiguration.m
index 2e2680e0..9deafb3b 100644
--- a/QiniuSDK/Storage/QNConfiguration.m
+++ b/QiniuSDK/Storage/QNConfiguration.m
@@ -32,6 +32,8 @@ - (instancetype)initWithBuilder:(QNConfigurationBuilder *)builder {
 		_recorderKeyGen = builder.recorderKeyGen;
 
 		_proxy = builder.proxy;
+
+		_converter = builder.converter;
 	}
 	return self;
 }
@@ -47,6 +49,12 @@ - (instancetype)init {
 		_putThreshold = 512 * 1024;
 		_retryMax = 5;
 		_timeoutInterval = 60;
+
+		_recorder = nil;
+		_recorderKeyGen = nil;
+
+		_proxy = nil;
+		_converter = nil;
 	}
 	return self;
 }
diff --git a/QiniuSDK/Storage/QNUploadManager.m b/QiniuSDK/Storage/QNUploadManager.m
index 41bf531a..98c04d4b 100644
--- a/QiniuSDK/Storage/QNUploadManager.m
+++ b/QiniuSDK/Storage/QNUploadManager.m
@@ -58,6 +58,7 @@ - (instancetype)initWithConfiguration:(QNConfiguration *)config {
 			config = [QNConfiguration build: ^(QNConfigurationBuilder *builder) {
 			}];
 		}
+		_config = config;
 #if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090)
 		BOOL lowVersion = NO;
 	#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED)
@@ -73,15 +74,15 @@ - (instancetype)initWithConfiguration:(QNConfiguration *)config {
 		}
 	#endif
 		if (lowVersion) {
-			_httpManager = [[QNHttpManager alloc] initWithTimeout:_config.timeoutInterval];
+			_httpManager = [[QNHttpManager alloc] initWithTimeout:config.timeoutInterval urlConverter:config.converter];
 		}
 		else {
-			_httpManager = [[QNSessionManager alloc] initWithProxy:config.proxy timeout:_config.timeoutInterval];
+			_httpManager = [[QNSessionManager alloc] initWithProxy:config.proxy timeout:config.timeoutInterval
+			                                          urlConverter:config.converter];
 		}
 #else
-		_httpManager = [[QNHttpManager alloc] initWithTimeout:_config.timeoutInterval];
+		_httpManager = [[QNHttpManager alloc] initWithTimeout:config.timeoutInterval urlConverter:config.converter];
 #endif
-		_config = config;
 	}
 	return self;
 }
diff --git a/QiniuSDKTests/QNFormUploadTest.m b/QiniuSDKTests/QNFormUploadTest.m
index e4cd307f..99ecd6a7 100644
--- a/QiniuSDKTests/QNFormUploadTest.m
+++ b/QiniuSDKTests/QNFormUploadTest.m
@@ -198,4 +198,35 @@ - (void)testProxy {
 	XCTAssert([@"FgoKnypncpQlV6tTVddq9EL49l4B" isEqualToString:testResp[@"key"]], @"Pass");
 }
 
+- (void)testUrlConvert {
+	__block QNResponseInfo *testInfo = nil;
+	__block NSDictionary *testResp = nil;
+	__block NSString *key = nil;
+
+	QNConfiguration *config = [QNConfiguration build: ^(QNConfigurationBuilder *builder) {
+	    builder.converter = ^NSString *(NSString *url) {
+	        return [url stringByReplacingOccurrencesOfString:@"upnono" withString:@"up"];
+		};
+	    builder.zone = [[QNZone alloc] initWithUpHost:@"upnono.qiniu.com" upHostBackup:@"" upIp:@""];
+	}];
+
+	QNUploadManager *upManager = [[QNUploadManager alloc] initWithConfiguration:config];
+
+	NSData *data = [@"Hello, World!" dataUsingEncoding:NSUTF8StringEncoding];
+	[upManager putData:data key:nil token:g_token complete: ^(QNResponseInfo *info, NSString *k, NSDictionary *resp) {
+	    key = k;
+	    testInfo = info;
+	    testResp = resp;
+	} option:nil];
+
+	AGWW_WAIT_WHILE(testInfo == nil, 100.0);
+	NSLog(@"%@", testInfo);
+	NSLog(@"%@", testResp);
+	XCTAssert(key == nil, @"Pass");
+	XCTAssert(testInfo.isOK, @"Pass");
+	XCTAssert(testInfo.reqId, @"Pass");
+	XCTAssert([testInfo.host isEqual:@"up.qiniu.com"], @"Pass");
+	XCTAssert([@"FgoKnypncpQlV6tTVddq9EL49l4B" isEqualToString:testResp[@"key"]], @"Pass");
+}
+
 @end
diff --git a/QiniuSDKTests/QNResumeUploadTest.m b/QiniuSDKTests/QNResumeUploadTest.m
index 2add1372..db1a44c2 100644
--- a/QiniuSDKTests/QNResumeUploadTest.m
+++ b/QiniuSDKTests/QNResumeUploadTest.m
@@ -147,7 +147,7 @@ - (void)testProxy {
 
 	QNUploadManager *upManager = [[QNUploadManager alloc] initWithConfiguration:config];
 
-	int size = 6 * 1024;
+	int size = 600;
 	NSURL *tempFile = [QNTempFile createTempfileWithSize:size * 1024];
 	NSString *keyUp = [NSString stringWithFormat:@"%dkproxy", size];
 	__block QNResponseInfo *info = nil;
@@ -165,5 +165,33 @@ - (void)testProxy {
 	[QNTempFile removeTempfile:tempFile];
 }
 
+- (void)testUrlConvert {
+	QNConfiguration *config = [QNConfiguration build: ^(QNConfigurationBuilder *builder) {
+	    builder.converter = ^NSString *(NSString *url) {
+	        return [url stringByReplacingOccurrencesOfString:@"upnono" withString:@"up"];
+		};
+	    builder.zone = [[QNZone alloc] initWithUpHost:@"upnono.qiniu.com" upHostBackup:@"" upIp:@""];
+	}];
+
+	QNUploadManager *upManager = [[QNUploadManager alloc] initWithConfiguration:config];
+
+	int size = 600;
+	NSURL *tempFile = [QNTempFile createTempfileWithSize:size * 1024];
+	NSString *keyUp = [NSString stringWithFormat:@"%dkconvert", size];
+	__block QNResponseInfo *info = nil;
+	__block NSString *key = nil;
+	[upManager putFile:tempFile.path key:keyUp token:g_token complete: ^(QNResponseInfo *i, NSString *k, NSDictionary *resp) {
+	    key = k;
+	    info = i;
+	} option:nil];
+
+	AGWW_WAIT_WHILE(key == nil, 60 * 30);
+	NSLog(@"info %@", info);
+	XCTAssert(info.isOK, @"Pass");
+	XCTAssert([keyUp isEqualToString:key], @"Pass");
+	XCTAssert([info.host isEqual:@"up.qiniu.com"], @"Pass");
+	[QNTempFile removeTempfile:tempFile];
+}
+
 #endif
 @end
diff --git a/QiniuSDKTests/QNSessionTest.m b/QiniuSDKTests/QNSessionTest.m
index 1029366e..a1899a44 100644
--- a/QiniuSDKTests/QNSessionTest.m
+++ b/QiniuSDKTests/QNSessionTest.m
@@ -15,6 +15,8 @@
 #import "QNSessionManager.h"
 #import "QNResponseInfo.h"
 
+#import "QNConfiguration.h"
+
 @interface QNSessionTest : XCTestCase
 @property QNSessionManager *httpManager;
 @end
@@ -90,7 +92,7 @@ - (void)testProxy {
 		(NSString *)kCFStreamPropertyHTTPProxyPort  : @8888,
 	};
 
-	QNSessionManager *httpManager = [[QNSessionManager alloc] initWithProxy:proxyDict timeout:60];
+	QNSessionManager *httpManager = [[QNSessionManager alloc] initWithProxy:proxyDict timeout:60 urlConverter:nil];
 	NSData *data = [@"Hello, World!" dataUsingEncoding:NSUTF8StringEncoding];
 	__block QNResponseInfo *testInfo = nil;
 	[httpManager post:@"http://up123.qiniu.com" withData:data withParams:nil withHeaders:nil withCompleteBlock: ^(QNResponseInfo *info, NSDictionary *resp) {
@@ -102,6 +104,24 @@ - (void)testProxy {
 	XCTAssert(testInfo.reqId, @"Pass");
 }
 
+- (void)testUrlConvert {
+	QNUrlConvert c = ^NSString *(NSString *url) {
+		return [url stringByReplacingOccurrencesOfString:@"upnono" withString:@"up"];
+	};
+
+	QNSessionManager *httpManager = [[QNSessionManager alloc] initWithProxy:nil timeout:60 urlConverter:c];
+	NSData *data = [@"Hello, World!" dataUsingEncoding:NSUTF8StringEncoding];
+	__block QNResponseInfo *testInfo = nil;
+	[httpManager post:@"http://upnono.qiniu.com" withData:data withParams:nil withHeaders:nil withCompleteBlock: ^(QNResponseInfo *info, NSDictionary *resp) {
+	    testInfo = info;
+	} withProgressBlock:nil withCancelBlock:nil];
+
+	AGWW_WAIT_WHILE(testInfo == nil, 100.0);
+	NSLog(@"%@", testInfo);
+	XCTAssert(testInfo.reqId, @"Pass");
+	XCTAssert([testInfo.host isEqual:@"up.qiniu.com"], @"Pass");
+}
+
 @end
 
 #endif