A client-side redirect is performed by the browser after it has received and begun processing the server's response. Unlike server-side redirects that operate at the HTTP level, client-side redirects rely on HTML meta refresh tags or JavaScript code to trigger navigation to a new URL.
Client-side redirects are inherently slower than server-side redirects because the browser must first establish a connection, receive the response, and parse enough of the document to encounter the redirect instruction. This adds at least one full page load cycle of latency before the redirect begins. Web performance books on Amazon quantify these delays.
Despite their performance disadvantage, client-side redirects have valid use cases. They are necessary on static hosting platforms that do not support server-side redirect configuration. They enable conditional redirects based on client-side information such as screen size, JavaScript capabilities, or cookie values. They also allow for splash pages or interstitial content before redirecting.
In URL shortening, client-side redirects appear in splash pages that display a preview of the destination, a countdown timer, or an advertisement before forwarding the user. While this adds latency, it provides an opportunity for the shortening service to display branding or generate ad revenue. Frontend architecture books on Amazon discuss these trade-offs.