How to use the sitemap.SitemapStream function in sitemap
To help you get started, we’ve selected a few sitemap examples, based on popular ways it is used in public projects.
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cswbrian / district-councils-dashboard / ssr / server / lib / sitemap.js View on Github 
server.get('/sitemap.xml', (req, res) => {
res.header('Content-Type', 'application/xml')
res.header('Content-Encoding', 'gzip')
try {
const smStream = new SitemapStream({
hostname: process.env.PUBLIC_URL,
})
const pipeline = smStream.pipe(createGzip())
getDistricts().then(urls => {
// Add URLs
urls.forEach(url => {
smStream.write(url)
})
smStream.end()
// cache the response
streamToPromise(pipeline).then(sm => sitemap = sm)
// stream the response
pipeline.pipe(res).on('error', (err) => { throw err })
})
