Getting data from port for plugin

Help and Feedback Scripting Support
#1

Hey everyone,

I am trying to make a plugin that gets JSON data from a port. How can I do this?

Thanks in advance.

#2

I’ve been spending a lot of time searching through the documentation and I can not find anything. Has anyone ever had to do anything like listening to a port?

#3

Can you explain what you mean? I don’t think you can listen for incoming data to a Roblox game, you would have to set up a server at a port and Request data from it.

2 Likes
#4

I mean in a way kind of like how Rojo works. Rojo connects to Roblox Studio by entering a port. I have an application that currently has a server set up at a port, but I don’t know how to get a Roblox plugin to get JSON data from that port.

#5

Just do RequestAsync to 127.0.0.1:YOURPORTHERE (or a specific IP if it’s not hosted locally). You can view Rojo’s source specifically here: https://github.com/Roblox/rojo/tree/master/plugin. Relevant bit:

https://github.com/Roblox/rojo/blob/master/plugin/src/Components/App.lua#LC113

3 Likes
#6

Do I put it in the URL?

		{
			Url = "127.0.0.1:"..port,  -- This website helps debug HTTP requests
			Method = "POST",
			Headers = {
				["Content-Type"] = "application/json"  -- When sending JSON, set this!
			},
			Body = HttpService:JSONEncode({hello = "world"})
		}
	)```
1 Like
#7

Yeah, the port is just a part of the URL.

2 Likes
#8

It tells me:
HTTP Services are not allowed to access ROBLOX services.

local function request()
	local response = HttpService:RequestAsync(
		{
			Url = "127.0.0.1:24981",  -- This website helps debug HTTP requests
		}
	)
 
	-- Inspect the response table
--	if response.Success then
--		print("Status code:", response.StatusCode, response.StatusMessage)
--		print("Response body:\n", response.Body)
--	else
--		print("The request failed:", response.StatusCode, response.StatusMessage)
--	end
end
 
-- Remember to wrap the function in a 'pcall' to prevent the script from breaking if the request fails
while wait() do
	local success, message = pcall(request)
	if not success then
		print("Http Request failed:", message)
	end
end

That is my current code.

#9

If you’re using it in a live game server, you have to reference your server using the actual IP. 127.0.0.1 is just the localhost.

2 Likes
#10

It’s a plugin running off Roblox studio, so isn’t that local?

#11

Yeah, that should be working fine. Odd. I guess Roblox doesn’t allow 127.0.0.1 at all, so you’d have to do your actual IP.

Try putting a protocol before 127.0.0.1, so http:// or https://.

3 Likes
#12 
local function request()
	local response = HttpService:GetAsync("https://127.0.0.1:24981")
end

Now it just says “ConnectFail”

To specify, I am attempting to connect to the program Quixel Bridge. When I open its logs, it says its sending to “127.0.0.1:24981”, but my Roblox plugin is not connecting.

#13

That means it can’t find whatever is hosted at that port. Could you have typed the port number wrong, or could it be expecting a different HTTP Method?

2 Likes
#14

I tried all 3 HTTP methods and copied the port directly from Quixel Bridge.

#15

Actually, now that I am trying it… Just simply typing into my browser 127.0.0.1 refuses to connect. It seems this isn’t a issue with my Roblox code.