You may have come across a scenario where you need to send data from a server running on your system's localhost to Outsystems. Consuming API on Outsystem is a futile approach since entering localhost URL doesn't works. This is because Outsystem service studio runs on cloud and hence doesn't have access to your system's localhost.

The solution I found is creating a proxy URL to send data to your localhost. Ngrok is suitable tool for this purpose. It will create a HTTPs endpoint that will direct any HTTP request to your localhost. Then use this proxy URL to consume API in Outsystem.

Here are the steps:

1. start your localhost server

2. Create a porxy URL. In a powershell window enter ngrok http your_port_number. 

3. In Outsystems service studio consume REST API and enter the proxy URL. Choose HTTP method as required.

Test the API and it should work.