Invalid SVG

gistfile1.js

const url = require("url")
const https = require("https")

const sizeOf = require("image-size")

const imgUrl = "https://raw.githubusercontent.com/Flagsmith/flagsmith/main/docs/static/img/self-hosted-architecture.svg"
const options = url.parse(imgUrl)

https.get(options, function (response) {
  const chunks = []
  response
    .on("data", function (chunk) {
      chunks.push(chunk)
    })
    .on("end", function () {
      const buffer = Buffer.concat(chunks)
      console.log(sizeOf(buffer))
    })
})