Postman

To test your HTTP service, the best tool is the Postman which has a GUI interface. The old version is running as part of the Chrome browser but the latest version is a standalone desktop application supports Linux, Mac and Windows.

Installation

To install it on Ubuntu Linux 18.04 and up, you can use snap.

snap install postman

Turn off Certificate Verification

As light-4j service has TLS enabled by default with a built-in self-signed certificate, you need either upload the certificate to the postman or simply turn off the certificate verification from settings/General/SSL certificate verification.

Upload the certificate

First, you need to export the certificate from client.truststore with Java keytool command and then you can upload from Settings/Certificates of the postman.