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