how to send POST HTTP request from Google Chrome without any extensions?
You can do the post and get in the same way as the browser does.You can use the header to put in information in key, value pair.Here is a tutorial on how you can do it - Send POST data using XMLHttpRequest
But it would be better if you use chrome extension POSTMAN which is very extensive and clean for testing REST services.
I think, using the URL bar will always result in a GET.
To send POST requests from a browser, set up an HTML <form> with method="POST", use the action attribute for the REST-URL and input tags for other parameters.