Asset Caching Policy

A Static-Asset Caching and Compression Policy

mod_expires to Deflate and Brotli in one file: a year for fingerprinted files, a day or a month for others, and revalidation for HTML.

Caching and compression for a static front endApache config

# Needs: mod_expires, mod_headers, mod_setenvif, mod_deflate, mod_brotli;
#        AllowOverride FileInfo Indexes
ExpiresActive On
ExpiresByType text/css "access plus 1 day"
ExpiresByType text/javascript "access plus 1 day"
ExpiresByType image/avif "access plus 1 month"
<FilesMatch "\.[0-9a-f]{8,}\.(css|js|mjs|woff2|avif|webp|svg)$">
  ExpiresActive Off
  Header set Cache-Control "public, max-age=31536000, immutable"
</FilesMatch>
<FilesMatch "\.(html|php)$">
  Header set Cache-Control "no-cache"
</FilesMatch>
AddOutputFilterByType BROTLI_COMPRESS;DEFLATE text/html text/css text/javascript image/svg+xml
SetEnvIfNoCase Accept-Encoding "\bbr\b" no-gzip

Lines 3 to 6 and 8 need Indexes; line 8 drops the Expires that mod_expires would add beside the year. Offered a browser's gzip, deflate, br, zstd, Apache 129 chose gzip until line 15 switched mod_deflate off for Brotli clients:

Output of 78

/css/app.3f9a1c2e.css  browser  br     1052  public, max-age=31536000, immutable
/css/app.3f9a1c2e.css  gzip     gzip   2801  public, max-age=31536000, immutable
/css/print.css         browser  br     1052  max-age=86400 +Expires
/index.html            browser  br       46  no-cache

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