How to use someone else's server?

Question

JavaScript

Good afternoon. There is a site that has a useful function, I don’t want to re-write the code, so I thought to use a ready-made version. For the request, I used fetch and sent the object as on the donor, but it did not work out. Maybe it's impossible to use someone else's server? If possible, how.

Answer 1

Set the proxy to the path to NGINX or whatever your site spins in. Requests come to your site and it sends them to another, changing the headers to the ones you need.

Answer 2

CORS

Answer 3

Yes, you can't send xhr and fetch requests from a browser to someone else's server unless they've given you permission to do so .

Answer 4

I made such a request from the backend but I do not receive the desired response, what is my mistake?
router.get("/", async(req, res) => {
const response = await fetch(" https://salegroups.ru/group/check ", {
method: 'POST', //
body: JSON. stringify({link:" https://vk.com/manutdone "}),
headers: {
"Accept":"*/*",
"Accept-Encoding":"ru-RU,ru;q=0.9,en -US;q=0.8,en;q=0.7",
"Connection":"keep-alive ",
'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
"Host ":"salegroups.ru",
"Origin":" https://salegroups.ru
"Sec-Fetch-Dest":"empty",
"Sec-Fetch-Mode":"cors",
"Sec-Fetch-Site": "same-origin",
"X-Requested-With": "XMLHttpRequest"
}
})
const json = await response;
console log(json);