Doggy OS Webpage loader

local function loadWebsite()
    local filePath = "web.code"
    if not fs.exists(filePath) then
        return nil
    end
    local file = fs.open(filePath, "r")
    local code = file.readAll()
    file.close()
    return code
end

rednet.open("top")  -- Assuming the modem is on the top
print("Webserver running...")

while true do
    local senderID, message = rednet.receive()
    if message == "GET" then
        local code = loadWebsite()
        if code then
            rednet.send(senderID, code)
        else
            rednet.send(senderID, "Website not found.")
        end
    end
end