How do I add my own custom header key/value on TWebHttpRequest?

Question

I've placed a non-visual TWebHttpRequest component onto my form and there is a Headers property where I can see and change some of the default headers:

But there doesn't seem to be a way to add my own custom header key/value to it.

This link shows a String List Editor for Headers, but I don't seem to have that on my side:

This is what I have on my side:

How would I go about adding my own custom Headers?

Answer 1

You can add custom headers during run-time using WebHttpRequest.Headers.AddPair like this:

WebHttpRequest.Headers.Clear;

WebHttpRequest.Headers.AddPair('custom-header','whatever');
WebHttpRequest.Headers.AddPair('Content-Type','application/json');

I haven't figured out how to add custom headers during design-time yet though. Maybe someone else can answer that.