Nuxt/lib/core/middleware/nuxt.js

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const generateETag = require('etag')
const fresh = require('fresh')
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const { getContext } = require('../../common/utils')
module.exports = async function nuxtMiddleware(req, res, next) {
// Get context
const context = getContext(req, res)
res.statusCode = 200
try {
const result = await this.renderRoute(req.url, context)
await this.nuxt.callHook('render:route', req.url, result)
const { html, cspScriptSrcHashes, error, redirected, getPreloadFiles } = result
if (redirected) {
return html
}
if (error) {
res.statusCode = context.nuxt.error.statusCode || 500
}
// Add ETag header
if (!error && this.options.render.etag) {
const etag = generateETag(html, this.options.render.etag)
if (fresh(req.headers, { etag })) {
res.statusCode = 304
res.end()
return
}
res.setHeader('ETag', etag)
}
// HTTP2 push headers for preload assets
if (!error && this.options.render.http2.push) {
// Parse resourceHints to extract HTTP.2 prefetch/push headers
// https://w3c.github.io/preload/#server-push-http-2
const pushAssets = []
const preloadFiles = getPreloadFiles()
const { shouldPush } = this.options.render.http2
const { publicPath } = this.resources.clientManifest
preloadFiles.forEach(({ file, asType, fileWithoutQuery, extension }) => {
// By default, we only preload scripts or css
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/* istanbul ignore if */
if (!shouldPush && asType !== 'script' && asType !== 'style') {
return
}
// User wants to explicitly control what to preload
if (shouldPush && !shouldPush(fileWithoutQuery, asType)) {
return
}
pushAssets.push(`<${publicPath}${file}>; rel=preload; as=${asType}`)
})
// Pass with single Link header
// https://preloadFilesblog.cloudflare.com/http-2-server-push-with-multiple-assets-per-link-header
// https://www.w3.org/Protocols/9707-link-header.html
res.setHeader('Link', pushAssets.join(','))
}
if (this.options.render.csp) {
res.setHeader('Content-Security-Policy', `script-src 'self' ${(cspScriptSrcHashes || []).join(' ')}`)
}
// Send response
res.setHeader('Content-Type', 'text/html; charset=utf-8')
res.setHeader('Content-Length', Buffer.byteLength(html))
res.end(html, 'utf8')
return html
} catch (err) {
/* istanbul ignore if */
if (context && context.redirected) {
console.error(err) // eslint-disable-line no-console
return err
}
next(err)
}
}