There are some commands available in Linux e.g. curl and wget which allows you to send HTTP commands, which you can USE to call and test your web services from Linux. Particular, Curl is used extensively to test RESTful Web Services because it can send POST request, GET request, request with HEADERS and also authenticate USING both BASIC and digest authentication.

If you are working with REST API, I suggest learning curl, it's very convenient to check if your API is working properly using curl from the command line. You can even write a script to automate those stuff.

There are some commands available in Linux e.g. curl and wget which allows you to send HTTP commands, which you can use to call and test your web services from Linux. Particular, Curl is used extensively to test RESTful Web Services because it can send POST request, GET request, request with headers and also authenticate using both basic and digest authentication.

If you are working with REST API, I suggest learning curl, it's very convenient to check if your API is working properly using curl from the command line. You can even write a script to automate those stuff.