Why can I not reach my localhost?
This tool cannot access localhost, or any endpoint behind your firewall or VPN, because it runs on the internet rather than on your computer. To reach one, sign in to Postman and use either the Postman Desktop App or the Desktop Agent in the web app. Both run on your own machine: the request goes straight from your computer to your endpoint, and your request data and credentials never pass through Postman's cloud.
Can the playground send binary messages?
Yes. Binary messages can be composed as Base64 or hexadecimal.
Can I filter WebSocket messages?
Yes. Search all visible events or filter the stream to sent or received messages.
Does the playground use variables?
No. It does not load workspace, collection, environment, cookie, history, or variable state.