look at the title
idk how to do specifically, a ping in javascript,
but I made this itty bitty snippet that returns
async function getResponseTimeOnce(){
var times = {};
times.beforeRequest = Date.now();
await fetch("https://randobytes.yimmee.repl.co/ping").then((serverReceive)=>{
serverReceive.json().then((serverReceive)=>{
times.serverReceive = serverReceive;
});
times.afterRequest = Date.now();
});
return times;
}
all I'm asking, is, which values am I supposed to subtract to get the ping time?
In standard ping programs, the latency measurement is always the round-trip-time (RTT). You should subtract beforeRequest from afterRequest to get the difference.
Source: https://developer.mozilla.org/en-US/docs/Glossary/Round_Trip_Time_(RTT)
$ ping example.com
PING example.com (216.58.194.174): 56 data bytes
64 bytes from 216.58.194.174: icmp_seq=0 ttl=55 time=25.050 ms
64 bytes from 216.58.194.174: icmp_seq=1 ttl=55 time=23.781 ms
64 bytes from 216.58.194.174: icmp_seq=2 ttl=55 time=24.287 ms
64 bytes from 216.58.194.174: icmp_seq=3 ttl=55 time=34.904 ms
64 bytes from 216.58.194.174: icmp_seq=4 ttl=55 time=26.119 ms
--- google.com ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 23.781/26.828/34.904/4.114 ms
For this particular application, you may also consider using the Performance API to get a high resolution timestamp.
Ping uses RTD/RTT (Round-trip delay/time). The RTD should be calculated from the time you sent the request to the time you receive the response.