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Handle Etag and If-none-match headers and 304 responses

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This commit is contained in:
Liran Nuna 2018-10-22 11:41:29 -07:00
parent a674d6a79c
commit 1b95c4c794
2 changed files with 29 additions and 4 deletions
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18
server.js
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@ -19,11 +19,21 @@ function getFox (req, res, version) {
let width = parseInt(req.params.width) || 400
if (width > 400) width = 400
const seed = sanitize(req.params.seed) || uuid()
const etag = `W/${seed}`
const contentType = 'image/png'
res.set('Cache-Control', 'public; max-age=' + cacheTimeout)
res.set('Content-Type', contentType)
res.set('Etag', etag)
if (req.headers['if-none-match'] === etag) {
res.status(304).end('')
return
}
const canvas = composeImage(width, width, seed, version)
const buffer = canvas.toBuffer('image/png')
res.set('Cache-Control', 'max-age=' + cacheTimeout)
res.set('Content-length', buffer.length)
res.type('png')
const buffer = canvas.toBuffer(contentType)
res.set('Content-Length', buffer.length)
res.end(buffer, 'binary')
}