diff --git a/src/Http/HttpDownloader.cpp b/src/Http/HttpDownloader.cpp
index 1d352080..d6162ee4 100644
--- a/src/Http/HttpDownloader.cpp
+++ b/src/Http/HttpDownloader.cpp
@@ -34,6 +34,11 @@ void HttpDownloader::startDownload(const string& url, const string& filePath,boo
 	}
 	if(bAppend){
 		auto currentLen = ftell(_saveFile);
+		if(currentLen){
+			//最少续传一个字节，怕遇到http 416的错误
+			currentLen -= 1;
+			fseek(_saveFile,-1,SEEK_CUR);
+		}
 		addHeader("Range", StrPrinter << "bytes=" << currentLen << "-" << endl);
 	}
 	setMethod("GET");
diff --git a/src/Http/HttpDownloader.h b/src/Http/HttpDownloader.h
index 93a04c19..ba890f0e 100644
--- a/src/Http/HttpDownloader.h
+++ b/src/Http/HttpDownloader.h
@@ -16,7 +16,7 @@ namespace Http {
 class HttpDownloader: public HttpClientImp {
 public:
 	typedef std::shared_ptr<HttpDownloader> Ptr;
-	typedef std::function<void(int code,const char *errMsg,const char *filePath)> onDownloadResult;
+	typedef std::function<void(ErrCode code,const char *errMsg,const char *filePath)> onDownloadResult;
 	HttpDownloader();
 	virtual ~HttpDownloader();
 	//开始下载文件,默认断点续传方式下载