[megous]

You can also copy curl command right from the browser network tab, to recreate the request.

[extraduder_ire]

I don't know of a reliable way of calling two separate curl commands at once though. Maybe abusing the shell job system, or learning the 'at' command. It has been a while since I've needed to do something like this.

[megous]

Why abuse? That's what it's for. I'd just copy paste the curl line into a script file several times and put & at the end of each line.

Then end the script with wait command and run the script.

[randunel]

if curl & curl is too slow, try using gnu/parallel.