d575b8edd6
Add ability to set more headers to mimic real content responses. Add ability to inject errors, to help in validating behavior.
101 lines
3.1 KiB
JavaScript
101 lines
3.1 KiB
JavaScript
//
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// This middleware function is intended to be used for testing caching behavior with Fastly.
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// It will intercept ALL URLs that are routed to it and respond with a simple HTML body
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// containing a timestamp.
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// The logic will detect certain values in the path and set the HTTP status and/or the
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// Surrogate-Control header value.
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//
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// NOTE: This middleware is intended to be removed once testing is complete!
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//
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import express from 'express'
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import crypto from 'crypto'
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const router = express.Router()
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router.get('/*', function (req, res) {
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// If X-CacheTest-Error is set, simulate the site being down (regardless of URL)
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if (req.get('X-CacheTest-Error')) {
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res.status(parseInt(req.get('X-CacheTest-Error'))).end()
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return
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}
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const cacheControlModeParam = req.get('X-CacheTest-CCMode') ?? 'none'
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const staleIfErrorParam = req.get('X-CacheTest-StaleIfError') ?? '300'
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const staleWhileRevalidateParam = req.get('X-CacheTest-StaleWhileRevalidate') ?? '60'
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const maxAgeParam = req.get('X-CacheTest-MaxAge') ?? '300'
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const path = req.params[0]
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const content = `<html>
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<body>
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<p>Timestamp: ${new Date()}</p>
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</body>
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</html>`
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let status = 200
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const surrogateControlValues = []
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if (path.includes('max-age')) surrogateControlValues.push(`max-age=${maxAgeParam}`)
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if (path.includes('must-revalidate')) surrogateControlValues.push('must-revalidate')
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if (path.includes('no-cache')) surrogateControlValues.push('no-cache')
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if (path.includes('no-store')) surrogateControlValues.push('no-store')
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if (path.includes('private')) surrogateControlValues.push('private')
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if (path.includes('proxy-revalidate')) surrogateControlValues.push('proxy-revalidate')
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if (path.includes('public')) surrogateControlValues.push('public')
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if (path.includes('stale-if-error'))
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surrogateControlValues.push(`stale-if-error=${staleIfErrorParam}`)
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if (path.includes('stale-while-revalidate'))
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surrogateControlValues.push(`stale-while-revalidate=${staleWhileRevalidateParam}`)
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if (path.includes('no-cookies')) {
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res.removeHeader('Set-Cookie')
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}
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if (path.includes('etag')) {
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res.set({
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ETag: `"${crypto.createHash('md5').update(content).digest('hex')}"`,
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})
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}
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if (path.includes('error500')) {
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status = 500
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} else if (path.includes('error502')) {
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status = 502
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} else if (path.includes('error503')) {
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status = 503
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} else if (path.includes('error504')) {
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status = 504
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}
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if (surrogateControlValues.length > 0) {
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switch (cacheControlModeParam) {
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case 'none':
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res.set({
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'surrogate-control': surrogateControlValues.join(', '),
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})
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break
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case 'both':
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res.set({
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'surrogate-control': surrogateControlValues.join(', '),
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'cache-control': surrogateControlValues.join(', ').replace('max-age', 's-maxage'),
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})
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break
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case 'only':
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res.set({
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'cache-control': surrogateControlValues.join(', ').replace('max-age', 's-maxage'),
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})
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break
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}
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}
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res.status(status)
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res.send(content)
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res.end()
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})
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export default router
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