Caching refers to the act of saving copies of files in a temporary storage location or cache so they are more easily accessible. A cache can be described as any temporary storage location that stores copies of files or data. However, the term is often used to refer to Internet technologies.
DNS servers cache
Consider real-world caches for food and other supplies to understand the workings of caches. Roald Amundsen, an explorer who had just returned from his South Pole trip in 1912 with his men, relied on the food caches they had built along the way. This was far more efficient than waiting to receive supplies from their base camp. Similar to caches on the Internet, they store temporarily the’supplies’ or content needed for users’ journeys across the internet.
What is CDN Caching?
A CDN (content delivery network) caches content (such images, videos or webpages) on proxy servers that are closer to users than the origin servers. A proxy server is a server which receives client requests and forwards them to other servers. A CDN can deliver content faster because the servers are closer than the user who made the request.
Think of a CDN as being like a chain of grocery stores: Instead of going all the way to the farms where food is grown, which could be hundreds of miles away, shoppers go to their local grocery store, which still requires some travel but is much closer. Groceries can be bought in minutes, instead of days because grocery stores have food from faraway farms. CDN caches the Internet content so webpages load faster.
Content delivery network (CDN), services are based on caching. A CDN is similar to browser caching, which stores files on a hard disk so they can be accessed more quickly. It moves your website content to powerful proxy server that are optimized for speedy content distribution.
What does caching mean for your business?
Reduce bandwidth costs
Delivering content from CDN cache proxies removes the burden from the origin (backend) server, significantly reducing bandwidth costs associated with serving content to numerous visitors. The percentage of cacheable content can affect how much bandwidth is reduced for most sites.
Improve user experience
CDNs are a global network of cache proxy server servers. They bring your website’s content closer for all visitors, regardless of where they may be. This content is delivered directly from the server, which significantly speeds up access and improves user experience.
Ensure reliable content delivery
CDNs can handle traffic volumes that are far beyond what most enterprise networks can support. CDN cache servers can be highly resilient and secure in situations where a self-hosted site may be disrupted by unexpected traffic spikes or denial of services attacks. They are therefore stable in peak traffic situations.
How does Cache CDN Servers work?
Proxy cache servers form the foundation of a CDN’s network data centers. They are strategically located around the world. These points of presence (PoPs) are chosen based on the traffic patterns in each region.
Many data centers may be needed in highly active areas with many users. Remote locations may only have one PoP, which can be used to cover large areas.
Once installed, cache servers serve as a repository of website content and allow local users to have faster access to the cached files. The connection time required to transmit website data is shorter the closer a cache server and the user is.
Hardware-wise, an individual cache server can be a content delivery machine with both RAM and SSD storage resources. RAM is the fastest option and is used to store high-priority web files. SSD is for less frequently requested but still cacheable web pages.
You must have cache options
You can refresh cached files by calling it. Some providers may not allow you to update the entire cache storage. In some cases, your CDN provider may limit how many purges you can do in a given time. A purging request’s effectiveness is determined by how long it takes to spread throughout the network.
This tool allows you to manually override cache headers and tag files that should always be served from cache. This tool is very useful for managing cache, especially when it’s combined with bulk management options, which allow you to apply the directives to whole folders (e.g. all JPG files within /template/images/).
For a period, cache
This is an improvement to the Always cache option. It allows you to specify a time period for which the object should remain in cache before refreshing. This allows for easier management of particular files and can be accessed via the CDN GUI. This option is best used to manage large files (e.g. all JS files cached for five day).