为了安全请不要随意将ASP.Net的validateRequest="false"
ASP.Net 1.1后引入了对提交表单自动检查是否存在XSS(跨站脚本攻击)的能力。当用户试图用<xxxx>之类的输入影响页面返回结果的时候,ASP.Net的引擎会引发一个 HttpRequestValidationExceptioin。默认情况下会返回如下文字的页面:
Server Error in '/YourApplicationPath' Application A potentially dangerous Request.Form value was detected from the client (txtName="<b>"). Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (txtName="<b>"). .... |
protected void Page_Error(object sender, EventArgs e) { Exception ex = Server.GetLastError(); if (ex is HttpRequestValidationException) { Response.Write("请您输入合法字符串。"); Server.ClearError(); // 如果不ClearError()这个异常会继续传到Application_Error()。 } } |