Unable to load files from static-asset folder of atlassian-jira

Hi All,

We are trying to fetch the js files from the static-asset folder present in the atlassian server directly during a custom plugin development but we are unable to load the files.
The run into NET HTTP2 ERROR as soon as the request reaches 60s. We checked the loadbalancer timeout, for us it is set to900s but still the request keeps failing.

Can anyone please suggest the alternative to fetch the static js files from server directly?