Add keep-alive option to fetch

[dimention]

keepalive: true option will lock a connection on the target server, and server connection limit will be reached faster

[Ycirn]

Wont this put less strain on the webserver?

[dimention]

https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/

For specific IP - yes, for many IPs no. We cannot do big bandwidth attacks with just TCP requests, so prolonging open connections could do the trick.