This is a script written in JS that can be used to create many requests at the same time.
Do note that this is a very easily blocked approach, and you should probably not do naughty stuff with this :P.
In node:
npm install node-fetch
node auto.mjs
On browsers: Open the browser console and copy and paste everything starting from line 8. I REPEAT, STARTING FROM LINE 8. There isn't anything that needs to be included in the browser.
Modify the constants at the beginning of the script. To set additional headers, add them into the function.
The response code will be spitted out, along with some basic information on these codes.
For reference to these codes please refer to https://developer.mozilla.org/en-US/docs/Web/HTTP/Status