caching – Page 4 – Tarik Billa

How do you set the expiry date or a maximum age in the HTTP headers for static resources in IIS

May 29, 2023 by Tarik

Leverage browser caching: Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network. http://code.google.com/speed/page-speed/docs/caching.html#LeverageBrowserCaching To set an expiry date or a maximum age in the HTTP headers for static resources Open IIS manager-> Click … Read more

Docker build is not using cache

May 22, 2023 by Tarik

From your Dockerfile, if you append lines to your Dockerfile, or change the code being built, there’s only one line that could be cached: RUN mkdir /code After that, you perform a: COPY . /code Since you have changed your Dockerfile, the contents of . have changed (the Dockerfile is part of .) and therefore … Read more

Stop browser to make HTTP requests for images that should stay cached – mod_expires

May 12, 2023 by Tarik

The behavior you are seeing is the intended (see RFC7234 for more details), specified behavior: All modern browsers will send HTTP requests to the server for every page element displayed, regardless of cache status. This was a design decision made at the request of web services (especially advertising networks) to ensure that HTTP servers were … Read more

Repository Pattern – Caching

May 10, 2023 by Tarik

It’s a good idea not to put the caching logic directly into your repository, as that violates the Single Responsibility Principle (SRP) and Separation of Concerns. SRP essentially states that your classes should only have one reason to change. If you conflate the concerns of data access and caching policy in the same class, then … Read more

How to cache Google map tiles for offline usage?

May 7, 2023 by Tarik

If you are trying to cache the tiles that Google serves, that may be a violation of Google’s Terms of Service (unless, under certain circumstances, if you’ve purchased their enterprise Maps API Premier). That’s why gmapcatcher has it crossed off their list. See http://code.google.com/p/gmapcatcher/issues/detail?id=210. At the gmapcatcher URL above, you will also find a shell … Read more

When does browser automatically clear cache of external JavaScript file?

May 3, 2023 by Tarik

You may pass a version string as a get parameter to the URL of your script tag. The parameter won’t be evaluated by the static JavaScript file but force the browser to get the new version. If you do not want to assign the version string every time you edited the source you may compute … Read more

What’s the difference between conflict miss and capacity miss

May 1, 2023 by Tarik

The important distinction here is between cache misses caused by the size of your data set, and cache misses caused by the way your cache and data alignment are organized. Lets assume you have a 32k direct mapped cache, and consider the following 2 cases: You repeatedly iterate over a 128k array. There’s no way … Read more

leverage browser caching – expires or max-age, last-modified or etag

April 25, 2023 by Tarik

Is this correct? Yes, Expires and max-age do the same thing, but in two different ways. Same thing with Last-Modified and Etag If so, should I do expires or max-age? Expires depends on accuracy of user’s clock, so it’s mostly a bad choice (as most browsers support HTTP/1.1). Use max-age, to tell the browser that … Read more

How does direct mapped cache work?

April 23, 2023 by Tarik

Okay. So let’s first understand how the CPU interacts with the cache. There are three layers of memory (broadly speaking) – cache (generally made of SRAM chips), main memory (generally made of DRAM chips), and storage (generally magnetic, like hard disks). Whenever CPU needs any data from some particular location, it first searches the cache … Read more

Force IE8 not to use Compatibility View

April 17, 2023 by Tarik

In the absence of an X-UA-Compatible http-equiv header, the compatibility mode is determined by the !DOCTYPE (or the absence of a !DOCTYPE, as the case may be). For a chart of which !DOCTYPE gives you which mode (in various browsers) see here: http://hsivonen.iki.fi/doctype/ (You’ll need to scroll down toward the bottom of the page.) You … Read more