Send Headername and Headerkey Trougth Browser

I have ad开发者_JAVA技巧ded security to one of my services, and I would like to test it, Is there some way of adding the Key and Name in the Header? How can I do that in Fiddler, What do I have to type?

If you simply want to add a custom header to all outbound requests, go to the FILTERS tab and in the Request Headers section, add your custom header.