Add some way of prepending the url prefix value to all of the included static files, etc.

[rmfan]

What would you like to be added:

Right now there is a flag --url_prefix to have the UI be available at http://<ip>:<port>/<url_prefix>. I would also like some way for the UI's dependent javascript, css, etc files to be located at http://<ip>:<port>/<url_prefix>/static instead of http://<ip>:<port>/static. This may be similar to Tensorboard's --path_prefix flag.

Why is this needed:

When http://<ip>:<port>/ (or http://<ip>:<port>/static) is not available, then the front end on http://<ip>:<port>/<url_prefix> produces errors. This may occur when the NNI UI is behind a reverse proxy like Nginx.

Without this feature, how does current nni work：

NNI's UI does not display anything if http://<ip>:<port>/static is not available

Components that may involve changes:

ts/webui

Brief description of your proposal if any:

[liuzhe-lz]

Thanks for your report. But seems we are too late for v2.3 release.
For now I suggest to workaround by copying static files to reverse proxy's path and add a special rule. All NNI experiments share same static files so this should work.
We will fix this in v2.4.