Discord Webhook only working in ROBLOX Studio and not in the game?

I made a script in ServerScriptService to post a message on a Discord channel. It creates a message when a player enters the game. It works in studio, but not in the game. I already tried putting it into a LocalScript into Workspace, but it failed. CODE:

local url = "https://discordapp.com/api/webhooks/479667015276167181/RSWm3A0TaH6i3R-2tzvTDIxuTitQvp-elE7smf0xd_Kdb55Rfza-t2cO_REQ2fsUGTfq"

local http = game:GetService("HttpService")

local HookData = {

['username'] = "HD ACTIVITY NOTICE",

['content'] = "@everyone Players are active in HD Admin House. Please come on down to the server to moderate!"

}

HookData = http:JSONEncode(HookData)

http:PostAsync(url, HookData)

You can't use HttpService on the client.

Even if you used a server script in live servers, you would receive a 403 forbidden error. Read my answer here.

Discord blocked ROBLOX webhooks due to abuse.

"Because over the past week, 88% of requests from the “Roblox/WinInet” that hit our API were invalid. We’ve decided to block the user-agent from talking to our API out-right." (Tweet)

"Specifically, sections 2.6 and 2.7 of our API Terms of Service were being violated, 2.6 because distributing tokens in plugins is not allowed, and the ROBLOX http client does not return headers/status codes, making it impossible to build a script compliant with our API Tos (2.7)." (Tweet)