Some browsers do use algorithms that let the page remain in cache for a day or more.. Google caching best practices guide states:. Also, you observe that the If-Modified-Since request header isn't sent from the Chrome browser when the same file is loaded again. Mostly the use case will be to set client-side caching of static resources as images, stylesheets, javascripts etc.. When the Expires header is already part of the response generated by the server, for example when generated by a CGI script or proxied from an origin server, this module does not change or add an Expires or Cache-Control header. A client can make requests with a no-cache header value and force the server to generate a new response for every request.. For example, either a client or a proxy server can cache the response.

Even if you have set Cache-Control: max-age=... header and Last-Modified header is present, you still don't observe any caching. Always honoring client Cache-Control request headers makes sense if … Separate from your direct question, but just a note that the line: add_header "X-UA-Compatible" "IE=Edge,chrome=1"; The typical calculation for this (which is … Or is this one of the files that would be served directly from file system. The following list contains a few of the more common values that are used. sudo nginx -s reload.

Once set, these HTTP response headers can restrict modern browsers from running into easily preventable vulnerabilities.

This iRule sets caching headers Expires and Cache-Control on the response.

RFC 7234 HTTP/1.1 Caching June 2014 * contains a public response directive (see Section 5.2.2.5).Note that any of the requirements listed above can be overridden by a cache-control extension; see Section 5.2.3.In this context, a cache has "understood" a request method or a response status code if it recognizes it and implements all specified caching-related behavior. The OWASP Secure Headers Project intends to raise awareness and use of these headers. When your visitor re-visits your website these copies can be used without the visitor having to re-download the files. The HTTP 1.1 Caching specification for the Cache-Control header requires a cache to honor a valid Cache-Control header sent by the client. HTTP-based caching respects request Cache-Control directives.

Commonly-Used HTTP/1.1 Cache-Control Header Values The HTTP/1.1 specification in RFC 2616 defines several values for the Cache-Control header. If there is no Cache-Control header and no Expires header, but there is a Last-Modified header (which most web servers send by default for static assets), most browsers will use heuristic freshness to determine how long to cache that asset for. Cache directive: Has a Cache-Control header with a public directive: Freshness: Has a Cache-Control header with a max-age or s-maxage directive, or an Expires header with a timestamp in the future: Content: Contains a valid Content-Length, Content-Range, or Transfer-Encoding header By using a browser caching mechanism you tell the browser of your visitor to copy and store your web files for later use. When the expiration passes, then the browser can send a conditional request using an If-Modified-Since header to ask if the object has been modified (since it’s Last-Modified-Date or from the last resource version the browser received). Live HTTP Headers logs all HTTP traffic between your Chrome browser and the Internet. It will honor, by default, the headers set by the origin server, then give precedence to the resource's mime-type (over it's … Is your origin sending back a Cache-Control header? To modify Cache-Control directives other than max-age (see RFC 2616 section 14.9), you can use the Header directive.


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