Edge Side Rendering (ESR) is a technique used in web application delivery to improve performance and provide personalized content to users. ESR involves caching rendered web pages or specific components of a page at the edge servers of a Content Delivery Network (CDN).
By caching rendered pages or components at the edge servers, ESR reduces the load on the application servers and reduces the time it takes for content to reach the user. When a user requests a page, the CDN's edge server checks if the rendered version of the page is already cached. If it is, the server delivers the cached version to the user without needing to access the application server. This reduces latency and improves website performance.
ESR can also be used to personalize content for users based on their preferences or location. The edge server can modify the cached content on the fly to include personalized information before delivering it to the user. For example, if a user has specified their preferred language, the edge server can retrieve the cached page and modify it to display the content in the user's preferred language.
ESR can be particularly beneficial for websites with dynamic content that requires frequent updates. By caching rendered pages or components at the edge servers, the CDN can quickly deliver up-to-date content without overloading the application server with requests for every user. This improves the scalability and responsiveness of the web application.
Overall, ESR is a technique that leverages caching at the edge servers of a CDN to improve website performance, reduce server load, and provide personalized content to users. It is commonly used in combination with other optimization techniques to create fast and responsive web applications.