This question has been asked in the github issue, and it was closed with a solution by checking the network. But I check the brower without finding any network problems.
Every request ends up with status code 200.
in example:
everything goes well except the map(No map).
The environment is:
ubuntu 14.04 LTS
Memory: 15.7 GiB
Graphical: Intel® Core™ i5-6400 CPU @ 2.70GHz × 4
CPU: Gallium 0.4 on SVGA3D; build: RELEASE;
System type: 64 bit
Disk: 76.0 GB
The browser is Chrome 55.0.2883.87 (64-bit)
Thanks in advance.