This is useful in case you don't want to host a static content itself, but want to proxy a site for other people (who knows your use case…). It can be used for spying clear text HTTP requests, don't use if for that!
This example proxies delete.nogafam.es to justdeleteme.xyz, setting an anonymous User-Agent (one taken from Tor Browser)
backend justdeleteme http-request set-header Host "justdeleteme.xyz" http-request set-header User-Agent "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" http-request del-header Cookie server deleteme1 185.199.110.153:443 ssl verify none sni req.hdr(host)