Problem solved: Error in REST request error occurred when starting Gazebo

environment:

Ubuntu18.04 + ROS melodic + Anaconda3

After installing ROS, when I opened gazebo for the first time, I encountered this red error:

 Found a solution on the Internet: Modify the .ignition/fuel/config.yaml file

First, create a new terminal and open the above file

sudo gedit .ignition/fuel/config.yaml

The content is as follows

comment out this sentence

url: https://api.ignitionfuel.org

 Then replace it with the following sentence

url: https://api.ignitionrobotics.org

save, exit

 reopen gazebo

roslaunch gazebo_ros empty_world.launch

problem no more