Response.Redirect

Question

User-1664485818 posted

Hi everyone, within my controller I have a method to check some logic, if false the user needs to be redirected to another website,

but I receive the following error; 

"The required anti-forgery form field "__RequestVerificationToken" is not present."

If i replace Response.Redirect with a return Redirect to a page within the website everything works ok, but I need to redirect the user to another website...

Any help much appreciated as always :)

                [HttpPost]
		[ValidateAntiForgeryToken]
		public ActionResult ValidateApplication(bool status)
		{

			if (status != true)
			{
				Response.Redirect("https://somewebsite");
			}
			else
			{
				return RedirectToUmbracoPage();
			}
		}

Answer 1

User475983607 posted

I assume you forgot to add the antiforgery token to the HTML form within the View.

Answer 2

User-1664485818 posted

Thanks, I have now added the following code to the view;

@Html.AntiForgeryToken()

 Now receiving this error;

An exception of type 'System.Web.HttpException' occurred in System.Web.dll but was not handled in user code
Additional information: Server cannot append header after HTTP headers have been sent. occurred

Answer 3

User475983607 posted

Thanks, I have now added the following code to the view;

@Html.AntiForgeryToken()

 Now receiving this error;

An exception of type 'System.Web.HttpException' occurred in System.Web.dll but was not handled in user code
Additional information: Server cannot append header after HTTP headers have been sent. occurred

The construct in MVC is to return a Redirect.

 return Redirect("https://www.google.com");

Answer 4

User-1664485818 posted

I added the code 

 return Redirect("https://www.google.com");

but, now receiving this error; 

Server Error in '/' Application.

---

A potentially dangerous Request.Path value was detected from the client (:).

Answer 5

User475983607 posted

Redirect has always worked.  The error message is related to the client making a request to your site not redirecting to google.  I assume the error is not related to return Redirect but a bug in your code base.

Please take a moment to review and debug your code.  If you need help troubleshooting your code then post enough code so we can reproduce the issue.

Answer 6

User-1664485818 posted

This is the url when the application fails

http://localhost:56973/umbraco/Surface/RegisterNewUser/https%3a/google.com

return RedirectToAction("https://google.com");

Answer 7

User475983607 posted

This is the url when the application fails

http://localhost:56973/umbraco/Surface/RegisterNewUser/https%3a/google.com

return RedirectToAction("https://google.com");

Of course it fails and of course the Google URL is appended to the URL as that's how RedirectToAction works.

Use...

return Redirect("https://www.google.com");

...when redirecting outside the current application or to a specific URL.

https://docs.microsoft.com/en-us/dotnet/api/system.web.mvc.controller.redirect?view=aspnet-mvc-5.2

Answer 8

User-1664485818 posted

Thank you, I owe you a beer or 2 much appreciated :)