Nginx or Lighttd redirect to cdn when load is high

Im trying to set up a server for static asset delivery with NGINX, but I need to somehow check the load on the server to redirect all requests to a CDN if server is load is +x amount

for example

if(server_load > 50/100)
{
redirect all requests to cdn.stackpath.com
}
else {
serve_file();
}

Does nginx have anything like this? I could work with lighttpd too
Mario BernheimCTOAsked:
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Aaron TomoskySD-WAN SimplifiedCommented:
You can set it up as a load balancer, perhaps with weights that you can adjust as the load changes?
http://nginx.org/en/docs/http/load_balancing.html

If it’s just static http images this should be fine, for anything https make sure you sticky sessions (iphash I believe for nginx)
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