This video tutorial is a part of tutorial-series Developing Web Apps using Go Language. In this part of tutorial we will discuss about importing and utilizing external packages of Go language as well as handling dynamic URL parameters. What you can learn. |--| 1. Importing and using External Packages. Handling Dynamic URL parameters. This video tutorial has been divided in to 4 steps. Step #1. Preparing the program. Step #2. Go get package. Step #3. Make use of External router / Gorilla router. Step #4. Testing. This video series is not meant for teaching every aspect of Go or the explanation of each command. Please refer to.