HTTP POST Request Issue

[busybird15]

Basically, my POST request should look like this (if it were JavaScript):

Here are my code blocks:

But when the request runs, I get:
Error 1103: Unable to complete request with the given text: "{"message": "test message"}"

What am I doing wrong?

[NishyanthKumar]

try this, instead:

[TIMAI2]

Try just writing the PostText as text in a text block:

{"message":"Hello World"}

[busybird15]

@NishyanthKumar @TIMAI2 , unfortunately none of these ways worked:

I still get the same error.

[busybird15]

Nevermind, this:

worked after I removed the "www" from the URL.