Why does adding a newline to StatusDescription in ASP.Net close the connection?

Question

When I return a StatusDescription with a newline using the HttpStatusCodeResult from ASP.Net MVC 3.0, the connection to my client is forcibly closed. App is hosted in IIS 7.

Answer 1

You can't have a linebreak in the middle of an HTTP header.

The HTTP protocol specifies the end of a header is a line break.

Since the line break is in the middle of a header, the header is not a valid header and you are getting this error.

Fix: Don't put a line break in the middle of an HTTP header.