Freshness: Freshness is a term used to describe whether an item within a cache is still considered a candidate to serve to a client.This is usually the desired outcome for most administrators. A high cache hit ratio means that a high percentage of the content was able to be retrieved from the cache. This is a ratio of the requests able to be retrieved from a cache to the total requests made. Cache hit ratio: A cache’s effectiveness is measured in terms of its cache hit ratio or hit rate.It is responsible for serving any content that could not be retrieved from a cache along the request route and for setting the caching policy for all content. If you are acting as the web server administrator, this is the machine that you control. Origin server: The origin server is the original location of the content.When dealing with caching, there are a few terms that you are likely to come across that might be unfamiliar. Availability of content during network interruptions: With certain policies, caching can be used to serve content to end users even when it may be unavailable for short periods of time from the origin servers.The content owner can leverage the powerful servers along the delivery path to take the brunt of certain content loads. Increased performance on the same hardware: For the server where the content originated, more performance can be squeezed from the same hardware by allowing aggressive caching.Caches maintained close to the user, like the browser cache, can make this retrieval nearly instantaneous. Improved responsiveness: Caching enables content to be retrieved faster because an entire network round trip is not necessary. When the content is cached closer to the consumer, requests will not cause much additional network activity beyond the cache. Decreased network costs: Content can be cached at various points in the network path between the content consumer and content origin.Some of the benefits that caching brings to content delivery are: BenefitsĮffective caching aids both content consumers and content providers. Subsequent requests for cached content can then be fulfilled from a cache closer to the user instead of sending the request all the way back to the web server. Web caching works by caching the HTTP responses for requests according to certain rules. Caches are found at every level of a content’s journey from the original server to the browser. Web caching is a core design feature of the HTTP protocol meant to minimize network traffic while improving the perceived responsiveness of the system as a whole. Web caching, the focus of this guide, is a different type of cache. Application caches and memory caches are both popular for their ability to speed up certain responses. There are many different types of caching available, each of which has its own characteristics. What Is Caching?Ĭaching is the term for storing reusable responses in order to make subsequent requests faster. We will talk about the benefits that caching affords, the side effects to be aware of, and the different strategies to employ to provide the best mixture of performance and flexibility. This will mainly cover how to select caching policies to ensure that caches throughout the internet can correctly process your content. In this guide, we will discuss some of the basic concepts of web content caching. Components throughout the delivery path can all cache items to speed up subsequent requests, subject to the caching policies declared for the content. Caching, or temporarily storing content from previous requests, is part of the core content delivery strategy implemented within the HTTP protocol. Intelligent content caching is one of the most effective ways to improve the experience for your site’s visitors.
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