Description Link to heading
After version 2021a, in order to reduce the file size, Webots set resource files such as textures and sounds up for network download by github. However, for well-known reasons, github is very inaccessible in China, so there will be errors like:
ERROR: Error downloading EXTERNPROTO 'StraightStairs': Cannot download 'https://raw.githubusercontent.com/cyberbotics/webots/R2022b/projects/objects/stairs/protos/StraightStairs.proto', error code: 1: Connection refused
ERROR: Error downloading EXTERNPROTO 'Spot': Cannot download 'https://raw.githubusercontent.com/cyberbotics/webots/R2022b/projects/robots/boston_dynamics/spot/protos/Spot.proto', error code: 1: Connection refused
ERROR: Error downloading EXTERNPROTO 'Roughcast': Cannot download 'https://raw.githubusercontent.com/cyberbotics/webots/R2022b/projects/appearances/protos/Roughcast.proto', error code: 1: Connection refused
ERROR: Error downloading EXTERNPROTO 'ThreadMetalPlate': Cannot download 'https://raw.githubusercontent.com/cyberbotics/webots/R2022b/projects/appearances/protos/ThreadMetalPlate.proto', error code: 1: Connection refused
which means you can’t download resource files from github.
Solution Link to heading
We can change the network preferences in Webots.
Click preferences->network, in the proxy column, check SOCKS v5, fill in 127.0.0.1 for Hostname and 7890 for Port.
Attention:First of all your own computer should have a proxy, and the port is related to your own settings.