I’ve marked my pages as cacheable, but my browser keeps requesting them on every request. How do I force the cache to keep representations of them?
Caches aren’t required to keep a representation and reuse it; they’re only required to not keep or use them under some conditions. All caches make decisions about which representations to keep based upon their size, type (e.g., image vs. html), or by how much space they have left to keep local copies. Yours may not be considered worth keeping around, compared to more popular or larger representations. Some caches do allow their administrators to prioritize what kinds of representations are kept, and some allow representations to be “pinned” in cache, so that they’re always available.
Caches aren’t required to keep a representation and reuse it; they’re only required to not keep or use them under some conditions. All caches make decisions about which representations to keep based upon their size, type (e.g., image vs. html), or by how much space they have left to keep local copies. Yours may not be considered worth keeping around, compared to more popular or larger representations. Some caches do allow their administrators to prioritize what kinds of representations are kept, and some allow representations to be “pinned” in cache, so that they’re always available. Implementation Notes — Web Servers Generally speaking, it’s best to use the latest version of whatever Web server you’ve chosen to deploy. Not only will they likely contain more cache-friendly features, new versions also usually have important security and performance improvements. Apache HTTP Server Apache uses optional modules to include headers, including both Expires and Cache-Control. Both modules are
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