403 Forbidden while using api.roblox.com (api.rprxy.xyz)?

Hello, i am making a custom player list to remove the new fat roblox player list wich is the old and i'm trying to know when someone is following another person so i used api.rprxy.xyz (proxy to use api.roblox.com) the request went well but i'm getting 403 Forbidden back, why?

local http = game:GetService("HttpService")
local client = script.Parent.Parent.Parent --// player
game.Players.PlayerAdded:Connect(function(plr)
local e = http:RequestAsync({
    Url = "https://api.rprxy.xyz/user/following-exists",
    Method = "GET",
    Headers = {
        userId = tostring(plr.UserId),
        followerUserId = tostring(client.UserId)
    }
    })
table.foreach(e,print)
--[[
table.foreach returns:
"
StatusMessage Forbidden
Success false
StatusCode 403
Body {"errors":[{"code":403,"message":"Forbidden"}]}
Headers table (random numbers)
"
--]]
end)

What could i be possibly be doing wrong?