How to POST to a REST API that requires Authentication using Fiddler

Last October I blogged about using Fiddler to Post to a REST API. Today’s post is very similar but I go one step further and post to a REST API site that requires Basic Authentication. When making a POST to a site requiring authentication, you must include authorization information in Request Header. Sounds simple enough, until you look at an example. In Fiddler, it looks like the image below:

The only piece of information you need to add to make Basic Authentication work is the Authorization: Basic line with the correct encoded value following it.  Despite my warning, this encoded value is easy to generate.  You just need to go to any web site that will do base64 encoding for you, plug in your logon and password using this format:

logon:password

Click the button to encode to Base64 (probably UTF8), and paste the resulting value into Fiddler.  I did this at http://www.base64encode.org as shown here:

Image of Base64Encode.org web site