I am using XmlhttpRequest to send a POST requests on localhost and chrome developer tools console and network to verify the requests.

I have two methods: Method1 send the post requests. Requesthandler handles the requests response.

When the request is successful (200) it does not throw an error and the request handler outputs a message on console. But when the request is unsuccessful. My console throws an error despite the request handler.

For example, If I purposely set the wrong url adress. I expect a 404 status Not Found exception and the request handler to output a message on console. Despite it happening, it still goes ahead and throws on the error on Send() Method.

Why xmlhttprequest.send() throws errors despite handling responses on the onreadystatechange event?

Method1(Sends Requests)

RequestHandler(Handles responses)

Console Message:

Thrown Error: