CDN, reverse proxy, and database replication

In this section, we will be briefly introduced to Content Delivery Network (CDN), reverse proxies, and the concept of database replication. Use of either or all of CDN, reverse proxies, or database replication is necessary when the application grows and receives a huge number of requests per second. A CDN is a huge set of servers that are deployed across multiple geographical locations. The purpose of a CDN is to deliver content to the end user from the nearest possible server. As an example, a website hosted in the US gets a request from a user in India. For this request to be complete, it will take a fair amount of time for the server in the US to process the response and send it over to the user in India. It would be easier if the content was housed close-by, so that the amount of time taken to complete the request will be shorter. CDNs help us solve this problem, where they would store static content on their servers and serve that content...