Sending HTTP POST Requests

I have a software that offers a REST API with a ton of tools to test and implement custom integrations. I'm new to all this and hoping someone could guide me in the right direction. I setup a basic flow using an inject, http request, and msg node. One of the tools this API offers is a generic events generator, I can successfully use it to push an event into the software with this requesting URL :
I have setup the node like this:

I get the following: {"_msgid":"b9ce20e.26a7fe","topic":"","payload":"Unauthorized

401 Unauthorized

","statusCode":401,"headers":{"date":"Mon, 13 Jan 2020 14:17:58 -0500","connection":"Keep-Alive","keep-alive":"timeout=5","content-type":"text/html; charset=utf-8","x-auth-result":"Auth_WrongDigest","x-server-guid":"{d63412df-4bbf-2528-2fed-9f023947c9cd}","content-length":"84","www-authenticate":"Digest realm="VMS", nonce="vkbXhZOz4lnXnlm9oyIa0Sw4B7G0ek=hzciip", algorithm=MD5","access-control-allow-origin":"*","x-node-red-request-node":"46737d14"},"responseUrl":"","redirectList":}

My headers when using the generic event generator look like this, I am pretty sure this is the problem just dont know how to fix it.....

I also would like to be able to send requests from my software to Node.Red.......any help would be greatly appreciated.

The response if 401 - Unauthorized - yet you don't have authentication selected (or configured) in the request node... so...

Yes thank you, shortly after writing this I realized that. All set.

one more thing, your title mentions POST requests, but you've the http-request node configured to use GET requests. Might help for future issues.