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Cache-Control boilerplate with extensive control (#325)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| # ---------------------------------------------------------------------- | ||
| # | Cache Control | | ||
| # ---------------------------------------------------------------------- | ||
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| # Serve resources with appropriate cache control directives. | ||
| # | ||
| # The `Cache-Control` header field holds directives (instructions) that control | ||
| # caching in browsers and shared caches (e.g. Proxies, CDNs). | ||
| # Its use targets web performances improvement by specifying the expected | ||
| # client and network caches behaviors. | ||
| # | ||
| # The usable cache directives are listed here: | ||
| # https://www.iana.org/assignments/http-cache-directives/http-cache-directives.xml | ||
| # | ||
| # The cache directives are documented here: | ||
| # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#response_directives | ||
| # | ||
| # (!) Enable and configure this configuration with care. | ||
| # Default values should embrace conformance for static files and simple | ||
| # apps, but cache control definition at backend level is highly preferred. | ||
| # Incorrect directives can lead to data leaks, or can degrade performances. | ||
| # | ||
| # More specifically, in-depth understanding on `public` vs `private` | ||
| # directives meanings is highly recommended. A resource with `public` will | ||
| # be cached by shared caches like CDN, even if a user session is active. | ||
| # | ||
| # (!) The config directive `Header` must be used with the appropriate action. | ||
| # Depending on the need, `merge` keeps the current value, if any, of | ||
| # `Cache-Control` header, while `set` reset the value including the one | ||
| # added by `ExpiresByType` directive in the cache expiration config file | ||
| # h5bp/web_performance/cache_expiration.conf. | ||
| # https://httpd.apache.org/docs/current/mod/mod_headers.html#header | ||
| # | ||
| # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control | ||
| # https://www.rfc-editor.org/rfc/rfc9111.html | ||
| # https://www.rfc-editor.org/rfc/rfc8246.html | ||
| # https://www.rfc-editor.org/rfc/rfc5861.html | ||
| # https://www.iana.org/assignments/http-cache-directives/http-cache-directives.xml | ||
| # https://cache-tests.fyi/ | ||
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| <IfModule mod_headers.c> | ||
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| # Default | ||
| Header merge Cache-Control "public, immutable, stale-while-revalidate" "expr=%{resp:Cache-Control} == 'max-age=31536000'" | ||
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| # No content | ||
| Header merge Cache-Control "no-store" "expr=-z %{CONTENT_TYPE}" | ||
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| # Manifest files | ||
| Header merge Cache-Control "public" "expr=%{CONTENT_TYPE} =~ m#application/manifest\+json#i" | ||
| Header set Cache-Control "no-cache" "expr=%{CONTENT_TYPE} =~ m#text/cache-manifest#i" | ||
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| # Assets | ||
| Header merge Cache-Control "public, immutable, stale-while-revalidate" "expr=%{CONTENT_TYPE} =~ m#image/x-icon#i" | ||
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| # Data interchange | ||
| Header merge Cache-Control "public, stale-while-revalidate" "expr=%{CONTENT_TYPE} =~ m#application/(atom|rdf|rss)\+xml#i" | ||
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| # Documents | ||
| Header set Cache-Control "no-cache, private, must-revalidate" "expr=%{CONTENT_TYPE} =~ m#text/(html|markdown|calendar)#i" | ||
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| # Data | ||
| Header set Cache-Control "no-cache" "expr=%{CONTENT_TYPE} =~ m#json|xml#i && %{CONTENT_TYPE} !~ m#/(atom|rdf|rss|manifest|svg)\+#i" | ||
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| </IfModule> |
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