webgui: disable canvas caching in draw.htm request
webgui: disable canvas caching in draw.htm request

Use no_root_json and no_h_json URL parameteres.
Automatically applied for webcanvas
zzxuanyuan/root,zzxuanyuan/root,olifre/root,karies/root,zzxuanyuan/root,olifre/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,root-mirror/root,olifre/root,zzxuanyuan/root,root-mirror/root,root-mirror/root,olifre/root,zzxuanyuan/root,karies/root,root-mirror/root,karies/root,karies/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,zzxuanyuan/root,olifre/root,olifre/root,zzxuanyuan/root,root-mirror/root,karies/root,zzxuanyuan/root,zzxuanyuan/root,root-mirror/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,olifre/root,karies/root