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Add etag header to optimized image response #18986

Merged
merged 9 commits into from
Nov 10, 2020
Merged

Add etag header to optimized image response #18986

merged 9 commits into from
Nov 10, 2020

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styfle
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@styfle styfle commented Nov 9, 2020 •
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Fixes #18563 by adding the etag header to the optimized image response.

This does not change the expireAt (TTL) for cached files on the server, which still uses the max-age of the upstream response.

The new file format on disk for cached image files is the following:

.next/cache/images/<HASHED_QUERYSTRING>/<EXPIREAT>.<ETAG>.<EXT>

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@styfle styfle marked this pull request as ready for review November 9, 2020 18:50
@styfle styfle changed the title Add etag header to optimized images Add etag header to optimized image response Nov 9, 2020
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@styfle styfle mentioned this pull request Nov 9, 2020
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ijjk commented Nov 9, 2020

Stats from current PR

Default Server Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
buildDuration 14s 14.1s ⚠️ +106ms
nodeModulesSize 85 MB 85 MB ⚠️ +2.27 kB
Page Load Tests Overall increase ✓
vercel/next.js canary vercel/next.js 18563-etag Change
/ failed reqs 0 0 ✓
/ total time (seconds) 2.668 2.652 -0.02
/ avg req/sec 936.94 942.8 +5.86
/error-in-render failed reqs 0 0 ✓
/error-in-render total time (seconds) 1.648 1.637 -0.01
/error-in-render avg req/sec 1517.06 1526.98 +9.92
Client Bundles (main, webpack, commons)
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..7d3b.js gzip 11.3 kB 11.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-6a509b2..b31a.js gzip 7.4 kB 7.4 kB ✓
webpack-e067..f178.js gzip 751 B 751 B ✓
Overall change 58.4 kB 58.4 kB ✓
Client Bundles (main, webpack, commons) Modern
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..dule.js gzip 7.04 kB 7.04 kB ✓
framework.HA..dule.js gzip 39 kB 39 kB ✓
main-0547acd..dule.js gzip 6.39 kB 6.39 kB ✓
webpack-07c5..dule.js gzip 751 B 751 B ✓
Overall change 53.1 kB 53.1 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js 18563-etag Change
polyfills-4b..e242.js gzip 31 kB 31 kB ✓
Overall change 31 kB 31 kB ✓
Client Pages
vercel/next.js canary vercel/next.js 18563-etag Change
_app-7231d4b..5856.js gzip 1.28 kB 1.28 kB ✓
_error-fca3d..2eb1.js gzip 3.44 kB 3.44 kB ✓
hooks-d4591d..e7c2.js gzip 887 B 887 B ✓
index-17468f..5d83.js gzip 227 B 227 B ✓
link-8a9d104..0e42.js gzip 1.55 kB 1.55 kB ✓
routerDirect..924c.js gzip 284 B 284 B ✓
withRouter-7..c13d.js gzip 284 B 284 B ✓
Overall change 7.96 kB 7.96 kB ✓
Client Pages Modern
vercel/next.js canary vercel/next.js 18563-etag Change
_app-75d3a82..dule.js gzip 625 B 625 B ✓
_error-4469a..dule.js gzip 2.29 kB 2.29 kB ✓
hooks-cbf13f..dule.js gzip 387 B 387 B ✓
index-b9a643..dule.js gzip 226 B 226 B ✓
link-d1cfb87..dule.js gzip 1.49 kB 1.49 kB ✓
routerDirect..dule.js gzip 284 B 284 B ✓
withRouter-f..dule.js gzip 282 B 282 B ✓
Overall change 5.59 kB 5.59 kB ✓
Client Build Manifests
vercel/next.js canary vercel/next.js 18563-etag Change
_buildManifest.js gzip 322 B 322 B ✓
_buildManife..dule.js gzip 330 B 330 B ✓
Overall change 652 B 652 B ✓
Rendered Page Sizes
vercel/next.js canary vercel/next.js 18563-etag Change
index.html gzip 1 kB 1 kB ✓
link.html gzip 1.01 kB 1.01 kB ✓
withRouter.html gzip 996 B 996 B ✓
Overall change 3.01 kB 3.01 kB ✓
Serverless Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
buildDuration 16s 16s -5ms
nodeModulesSize 85 MB 85 MB ⚠️ +2.27 kB
Client Bundles (main, webpack, commons)
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..7d3b.js gzip 11.3 kB 11.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-6a509b2..b31a.js gzip 7.4 kB 7.4 kB ✓
webpack-e067..f178.js gzip 751 B 751 B ✓
Overall change 58.4 kB 58.4 kB ✓
Client Bundles (main, webpack, commons) Modern
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..dule.js gzip 7.04 kB 7.04 kB ✓
framework.HA..dule.js gzip 39 kB 39 kB ✓
main-0547acd..dule.js gzip 6.39 kB 6.39 kB ✓
webpack-07c5..dule.js gzip 751 B 751 B ✓
Overall change 53.1 kB 53.1 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js 18563-etag Change
polyfills-4b..e242.js gzip 31 kB 31 kB ✓
Overall change 31 kB 31 kB ✓
Client Pages
vercel/next.js canary vercel/next.js 18563-etag Change
_app-7231d4b..5856.js gzip 1.28 kB 1.28 kB ✓
_error-fca3d..2eb1.js gzip 3.44 kB 3.44 kB ✓
hooks-d4591d..e7c2.js gzip 887 B 887 B ✓
index-17468f..5d83.js gzip 227 B 227 B ✓
link-8a9d104..0e42.js gzip 1.55 kB 1.55 kB ✓
routerDirect..924c.js gzip 284 B 284 B ✓
withRouter-7..c13d.js gzip 284 B 284 B ✓
Overall change 7.96 kB 7.96 kB ✓
Client Pages Modern
vercel/next.js canary vercel/next.js 18563-etag Change
_app-75d3a82..dule.js gzip 625 B 625 B ✓
_error-4469a..dule.js gzip 2.29 kB 2.29 kB ✓
hooks-cbf13f..dule.js gzip 387 B 387 B ✓
index-b9a643..dule.js gzip 226 B 226 B ✓
link-d1cfb87..dule.js gzip 1.49 kB 1.49 kB ✓
routerDirect..dule.js gzip 284 B 284 B ✓
withRouter-f..dule.js gzip 282 B 282 B ✓
Overall change 5.59 kB 5.59 kB ✓
Client Build Manifests
vercel/next.js canary vercel/next.js 18563-etag Change
_buildManifest.js gzip 322 B 322 B ✓
_buildManife..dule.js gzip 330 B 330 B ✓
Overall change 652 B 652 B ✓
Serverless bundles Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
_error.js 915 kB 915 kB ⚠️ +284 B
404.html 4.73 kB 4.73 kB ✓
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link.js 964 kB 965 kB ⚠️ +284 B
routerDirect.js 957 kB 958 kB ⚠️ +284 B
withRouter.js 957 kB 958 kB ⚠️ +284 B
Overall change 4.72 MB 4.72 MB ⚠️ +1.42 kB
Commit: eaca4cd

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Stats from current PR

Default Server Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
buildDuration 11.5s 11.8s ⚠️ +223ms
nodeModulesSize 85 MB 85 MB ⚠️ +2.27 kB
Page Load Tests Overall increase ✓
vercel/next.js canary vercel/next.js 18563-etag Change
/ failed reqs 0 0 ✓
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/ avg req/sec 1152.69 1134.72 ⚠️ -17.97
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/error-in-render avg req/sec 1978.65 2115.91 +137.26
Client Bundles (main, webpack, commons)
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..7d3b.js gzip 11.3 kB 11.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-6a509b2..b31a.js gzip 7.4 kB 7.4 kB ✓
webpack-e067..f178.js gzip 751 B 751 B ✓
Overall change 58.4 kB 58.4 kB ✓
Client Bundles (main, webpack, commons) Modern
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..dule.js gzip 7.04 kB 7.04 kB ✓
framework.HA..dule.js gzip 39 kB 39 kB ✓
main-0547acd..dule.js gzip 6.39 kB 6.39 kB ✓
webpack-07c5..dule.js gzip 751 B 751 B ✓
Overall change 53.1 kB 53.1 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js 18563-etag Change
polyfills-4b..e242.js gzip 31 kB 31 kB ✓
Overall change 31 kB 31 kB ✓
Client Pages
vercel/next.js canary vercel/next.js 18563-etag Change
_app-7231d4b..5856.js gzip 1.28 kB 1.28 kB ✓
_error-fca3d..2eb1.js gzip 3.44 kB 3.44 kB ✓
hooks-d4591d..e7c2.js gzip 887 B 887 B ✓
index-17468f..5d83.js gzip 227 B 227 B ✓
link-8a9d104..0e42.js gzip 1.55 kB 1.55 kB ✓
routerDirect..924c.js gzip 284 B 284 B ✓
withRouter-7..c13d.js gzip 284 B 284 B ✓
Overall change 7.96 kB 7.96 kB ✓
Client Pages Modern
vercel/next.js canary vercel/next.js 18563-etag Change
_app-75d3a82..dule.js gzip 625 B 625 B ✓
_error-4469a..dule.js gzip 2.29 kB 2.29 kB ✓
hooks-cbf13f..dule.js gzip 387 B 387 B ✓
index-b9a643..dule.js gzip 226 B 226 B ✓
link-d1cfb87..dule.js gzip 1.49 kB 1.49 kB ✓
routerDirect..dule.js gzip 284 B 284 B ✓
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Overall change 5.59 kB 5.59 kB ✓
Client Build Manifests
vercel/next.js canary vercel/next.js 18563-etag Change
_buildManifest.js gzip 322 B 322 B ✓
_buildManife..dule.js gzip 330 B 330 B ✓
Overall change 652 B 652 B ✓
Rendered Page Sizes
vercel/next.js canary vercel/next.js 18563-etag Change
index.html gzip 1 kB 1 kB ✓
link.html gzip 1.01 kB 1.01 kB ✓
withRouter.html gzip 996 B 996 B ✓
Overall change 3.01 kB 3.01 kB ✓
Serverless Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
buildDuration 13.1s 13.3s ⚠️ +123ms
nodeModulesSize 85 MB 85 MB ⚠️ +2.27 kB
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vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..7d3b.js gzip 11.3 kB 11.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-6a509b2..b31a.js gzip 7.4 kB 7.4 kB ✓
webpack-e067..f178.js gzip 751 B 751 B ✓
Overall change 58.4 kB 58.4 kB ✓
Client Bundles (main, webpack, commons) Modern
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..dule.js gzip 7.04 kB 7.04 kB ✓
framework.HA..dule.js gzip 39 kB 39 kB ✓
main-0547acd..dule.js gzip 6.39 kB 6.39 kB ✓
webpack-07c5..dule.js gzip 751 B 751 B ✓
Overall change 53.1 kB 53.1 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js 18563-etag Change
polyfills-4b..e242.js gzip 31 kB 31 kB ✓
Overall change 31 kB 31 kB ✓
Client Pages
vercel/next.js canary vercel/next.js 18563-etag Change
_app-7231d4b..5856.js gzip 1.28 kB 1.28 kB ✓
_error-fca3d..2eb1.js gzip 3.44 kB 3.44 kB ✓
hooks-d4591d..e7c2.js gzip 887 B 887 B ✓
index-17468f..5d83.js gzip 227 B 227 B ✓
link-8a9d104..0e42.js gzip 1.55 kB 1.55 kB ✓
routerDirect..924c.js gzip 284 B 284 B ✓
withRouter-7..c13d.js gzip 284 B 284 B ✓
Overall change 7.96 kB 7.96 kB ✓
Client Pages Modern
vercel/next.js canary vercel/next.js 18563-etag Change
_app-75d3a82..dule.js gzip 625 B 625 B ✓
_error-4469a..dule.js gzip 2.29 kB 2.29 kB ✓
hooks-cbf13f..dule.js gzip 387 B 387 B ✓
index-b9a643..dule.js gzip 226 B 226 B ✓
link-d1cfb87..dule.js gzip 1.49 kB 1.49 kB ✓
routerDirect..dule.js gzip 284 B 284 B ✓
withRouter-f..dule.js gzip 282 B 282 B ✓
Overall change 5.59 kB 5.59 kB ✓
Client Build Manifests
vercel/next.js canary vercel/next.js 18563-etag Change
_buildManifest.js gzip 322 B 322 B ✓
_buildManife..dule.js gzip 330 B 330 B ✓
Overall change 652 B 652 B ✓
Serverless bundles Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
_error.js 915 kB 915 kB ⚠️ +284 B
404.html 4.73 kB 4.73 kB ✓
hooks.html 3.92 kB 3.92 kB ✓
index.js 915 kB 916 kB ⚠️ +284 B
link.js 964 kB 965 kB ⚠️ +284 B
routerDirect.js 957 kB 958 kB ⚠️ +284 B
withRouter.js 957 kB 958 kB ⚠️ +284 B
Overall change 4.72 MB 4.72 MB ⚠️ +1.42 kB
Commit: 7e13c24

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LGTM!

@vercel vercel bot temporarily deployed to Preview November 10, 2020 04:16 Inactive
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ijjk commented Nov 10, 2020

Stats from current PR

Default Server Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
buildDuration 13.1s 12.7s -371ms
nodeModulesSize 85 MB 85 MB ⚠️ +2.27 kB
Page Load Tests Overall increase ✓
vercel/next.js canary vercel/next.js 18563-etag Change
/ failed reqs 0 0 ✓
/ total time (seconds) 2.394 2.327 -0.07
/ avg req/sec 1044.32 1074.28 +29.96
/error-in-render failed reqs 0 0 ✓
/error-in-render total time (seconds) 1.264 1.258 -0.01
/error-in-render avg req/sec 1978.24 1987.68 +9.44
Client Bundles (main, webpack, commons)
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..7d3b.js gzip 11.3 kB 11.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-6a509b2..b31a.js gzip 7.4 kB 7.4 kB ✓
webpack-e067..f178.js gzip 751 B 751 B ✓
Overall change 58.4 kB 58.4 kB ✓
Client Bundles (main, webpack, commons) Modern
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..dule.js gzip 7.04 kB 7.04 kB ✓
framework.HA..dule.js gzip 39 kB 39 kB ✓
main-0547acd..dule.js gzip 6.39 kB 6.39 kB ✓
webpack-07c5..dule.js gzip 751 B 751 B ✓
Overall change 53.1 kB 53.1 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js 18563-etag Change
polyfills-4b..e242.js gzip 31 kB 31 kB ✓
Overall change 31 kB 31 kB ✓
Client Pages
vercel/next.js canary vercel/next.js 18563-etag Change
_app-7231d4b..5856.js gzip 1.28 kB 1.28 kB ✓
_error-fca3d..2eb1.js gzip 3.44 kB 3.44 kB ✓
hooks-d4591d..e7c2.js gzip 887 B 887 B ✓
index-17468f..5d83.js gzip 227 B 227 B ✓
link-8a9d104..0e42.js gzip 1.55 kB 1.55 kB ✓
routerDirect..924c.js gzip 284 B 284 B ✓
withRouter-7..c13d.js gzip 284 B 284 B ✓
Overall change 7.96 kB 7.96 kB ✓
Client Pages Modern
vercel/next.js canary vercel/next.js 18563-etag Change
_app-75d3a82..dule.js gzip 625 B 625 B ✓
_error-4469a..dule.js gzip 2.29 kB 2.29 kB ✓
hooks-cbf13f..dule.js gzip 387 B 387 B ✓
index-b9a643..dule.js gzip 226 B 226 B ✓
link-d1cfb87..dule.js gzip 1.49 kB 1.49 kB ✓
routerDirect..dule.js gzip 284 B 284 B ✓
withRouter-f..dule.js gzip 282 B 282 B ✓
Overall change 5.59 kB 5.59 kB ✓
Client Build Manifests
vercel/next.js canary vercel/next.js 18563-etag Change
_buildManifest.js gzip 322 B 322 B ✓
_buildManife..dule.js gzip 330 B 330 B ✓
Overall change 652 B 652 B ✓
Rendered Page Sizes
vercel/next.js canary vercel/next.js 18563-etag Change
index.html gzip 1 kB 1 kB ✓
link.html gzip 1.01 kB 1.01 kB ✓
withRouter.html gzip 996 B 996 B ✓
Overall change 3.01 kB 3.01 kB ✓
Serverless Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
buildDuration 14.4s 14.5s ⚠️ +127ms
nodeModulesSize 85 MB 85 MB ⚠️ +2.27 kB
Client Bundles (main, webpack, commons)
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..7d3b.js gzip 11.3 kB 11.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-6a509b2..b31a.js gzip 7.4 kB 7.4 kB ✓
webpack-e067..f178.js gzip 751 B 751 B ✓
Overall change 58.4 kB 58.4 kB ✓
Client Bundles (main, webpack, commons) Modern
vercel/next.js canary vercel/next.js 18563-etag Change
677f882d2ed8..dule.js gzip 7.04 kB 7.04 kB ✓
framework.HA..dule.js gzip 39 kB 39 kB ✓
main-0547acd..dule.js gzip 6.39 kB 6.39 kB ✓
webpack-07c5..dule.js gzip 751 B 751 B ✓
Overall change 53.1 kB 53.1 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js 18563-etag Change
polyfills-4b..e242.js gzip 31 kB 31 kB ✓
Overall change 31 kB 31 kB ✓
Client Pages
vercel/next.js canary vercel/next.js 18563-etag Change
_app-7231d4b..5856.js gzip 1.28 kB 1.28 kB ✓
_error-fca3d..2eb1.js gzip 3.44 kB 3.44 kB ✓
hooks-d4591d..e7c2.js gzip 887 B 887 B ✓
index-17468f..5d83.js gzip 227 B 227 B ✓
link-8a9d104..0e42.js gzip 1.55 kB 1.55 kB ✓
routerDirect..924c.js gzip 284 B 284 B ✓
withRouter-7..c13d.js gzip 284 B 284 B ✓
Overall change 7.96 kB 7.96 kB ✓
Client Pages Modern
vercel/next.js canary vercel/next.js 18563-etag Change
_app-75d3a82..dule.js gzip 625 B 625 B ✓
_error-4469a..dule.js gzip 2.29 kB 2.29 kB ✓
hooks-cbf13f..dule.js gzip 387 B 387 B ✓
index-b9a643..dule.js gzip 226 B 226 B ✓
link-d1cfb87..dule.js gzip 1.49 kB 1.49 kB ✓
routerDirect..dule.js gzip 284 B 284 B ✓
withRouter-f..dule.js gzip 282 B 282 B ✓
Overall change 5.59 kB 5.59 kB ✓
Client Build Manifests
vercel/next.js canary vercel/next.js 18563-etag Change
_buildManifest.js gzip 322 B 322 B ✓
_buildManife..dule.js gzip 330 B 330 B ✓
Overall change 652 B 652 B ✓
Serverless bundles Overall increase ⚠️
vercel/next.js canary vercel/next.js 18563-etag Change
_error.js 915 kB 915 kB ⚠️ +284 B
404.html 4.73 kB 4.73 kB ✓
hooks.html 3.92 kB 3.92 kB ✓
index.js 915 kB 916 kB ⚠️ +284 B
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withRouter.js 957 kB 958 kB ⚠️ +284 B
Overall change 4.72 MB 4.72 MB ⚠️ +1.42 kB
Commit: 20ef404

@kodiakhq kodiakhq bot merged commit 9573426 into canary Nov 10, 2020
@kodiakhq kodiakhq bot deleted the 18563-etag branch November 10, 2020 04:40
@styfle styfle mentioned this pull request Nov 16, 2020
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julix-unity
julix-unity reviewed Apr 12, 2021
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packages/next/next-server/server/image-optimizer.ts
buffer: Buffer
) {
const etag = getHash([buffer])
res.setHeader('Cache-Control', 'public, max-age=0, must-revalidate')
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@kodiakhq @Timer

I don't understand this line - why is the cache max-age set to 0? Does this affect images?

I thought images would be 60 seconds as per https://nextjs.org/docs/basic-features/image-optimization#caching

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I agree it's a bit confusing, it caught me off guard as well.

What I get from it is that there are two different forms of caching: on the process hosting NextJS (server) and browser (client) side.

Here, the client side is instructed to always check if there's a newer version of the image available. Which is necessary with the introduction of etags to allow the NextJS process to invalidate images at any time.

On the server side, NextJS has its own cache for the generated images. The cached image will be served according to the max-age header value when retrieving the image, defaulting to 60 seconds if the header was not supplied.

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Cache-Control not automatically generating ETags and Last-Modified, RE: Image Optimization Next10
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@styfle @ijjk @Timer @Addono @julix-unity