Let me explain it in 2021, with updated information and links to the code. It’s a relatively straightforward and simple (no rocket science) concept, but, at the same, a very tricky thing that as a developer you should really know before it comes to bite you! What is Etag? So, Etag (per Wikipedia/Etag), is a … Read more
a) If the server includes this header: Cache-Control “max-age=3600, must-revalidate” it is telling both client caches and proxy caches that once the content is stale (older than 3600 seconds) they must revalidate at the origin server before they can serve the content. This should be the default behavior of caching systems, but the must-revalidate directive … Read more
I have faced same problem. I had to supply ‘public’ headers my cdn. By default when gateway caching is enabled in prod mode, it returns 200 OK with private, nocache must validate headers. I solved problem this way. In app.php, before I send response to user ($respond->send), I have overwritten the cache control header to … Read more
angular-cli resolves this by providing an –output-hashing flag for the build command (versions 6/7, for later versions see here). Example usage: ng build –output-hashing=all Bundling & Tree-Shaking provides some details and context. Running ng help build, documents the flag: –output-hashing=none|all|media|bundles (String) Define the output filename cache-busting hashing mode. aliases: -oh <value>, –outputHashing <value> Although this … Read more
try this <?php header(“Cache-Control: no-store, no-cache, must-revalidate, max-age=0”); header(“Cache-Control: post-check=0, pre-check=0”, false); header(“Pragma: no-cache”); ?>
The only difference is that with Private you are not allowing proxies to cache the data that travels through them. In the end, it all boils down to the data contained in the pages/files you are sending. For example, your ISP could have an invisible proxy between you and the Internet, that is caching web … Read more
Cache-Control: private Indicates that all or part of the response message is intended for a single user and MUST NOT be cached by a shared cache, such as a proxy server. From RFC2616 section 14.9.1
First, using those multiple domains requires several DNS lookups. You’d be better off combining many of those images into a sprite instead of spreading the requests. Second, when I load your page, I see most of the blocking (~1.25s) on all.js. I see that begins with (an old version of) jQuery. You should reference that … Read more
Cache-Control was introduced in HTTP/1.1 and offers more options than Expires. They can be used to accomplish the same thing but the data value for Expires is an HTTP date whereas Cache-Control max-age lets you specify a relative amount of time so you could specify “X hours after the page was requested”. HTML Cache control … Read more