xUtils下载文件时总大小返回-1问题

xUtils下载文件时无法返回总大小是因为Accept-Encoding头设置问题，需要设置Accept-Encoding头为“identity”，设置方法如下：

HttpUtils http = new HttpUtils();((DefaultHttpClient)http.getHttpClient()).addRequestInterceptor(new HttpRequestInterceptor() {@Overridepublic void process(org.apache.http.HttpRequest httpRequest, HttpContext httpContext) throws org.apache.http.HttpException, IOException {if (!httpRequest.containsHeader("Accept-Encoding")) {httpRequest.addHeader("Accept-Encoding", "identity");} else {httpRequest.setHeader("Accept-Encoding", " identity");}}});