The Cache-Control header is the most important header to set as it effectively ‘switches on’ caching in the browser. Without the cache-control header set, no other caching headers will yield any results. An application using HTTP cache headers is able to control this caching behavior and alleviate server-side load. In these instances it is beneficial for the users browser to cache this file locally, and use that copy whenever the resource is requested again. This holds true for many asset types like javascript files, images and even infrequently changing dynamic content. When an item is fully cached, the browser may choose to not contact the server at all and simply use its own cached copy:įor instance, once CSS stylesheets from your application are downloaded by the browser there’s no need to download them again during the user’s session. As your application serves resources it can attach cache headers to the response specifying the desired cache behavior. HTTP caching occurs when the browser stores local copies of web resources for faster retrieval the next time the resource is required. This article discusses the specifics of HTTP caching and in what scenarios to employ an HTTP cache header based strategy. However, incorrect caching can cause users to see out-of-date content and hard to debug issues. Appropriate use of these standards can benefit your application greatly, improving response times and reducing server load. HTTP caching is a universally adopted specification across all modern web browsers, making its implementation in web applications simple. One of the most frequently overlooked technologies is that of the HTTP cache. The modern day developer has a wide variety of techniques and technologies available to improve application performance and end-user experience.
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