Prevent browser caching of AJAX call result

Diving into cache control

When dealing with AJAX calls, caching tends to be a double-edged sword: it improves performance but can serve outdated data. Here's how to wield it like a master.

HTTP Headers: Your caching control knobs

• Cache-Control: Use no-cache, no-store, must-revalidate to specify the freshness of the response. Like setting yogurt's expiration date, everyone knows when it's no good.
• Pragma: A legacy directive to help older HTTP/1.0 clients recognize not to cache. Backwards compatibility, you know!
• Expires: Ideally set to 0 or a past date that signifies staleness. Like a plate of cookies left out too long, no one's going in for a second.

AJAX level control: Getting granular

Side-step global settings like a ninja by using $.ajax() with cache: false for individual calls. It keeps control where you want it — per request:

$.ajax({ url: "your_api", cache: false, success: function(data){
  // Who has 2 thumbs and controls caching? 👍👍 This guy!
}});
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Query strings: The not-so-hot cache buster

Appending unique values like new Date().getTime() prevents caching but could over-bloat your server. Like putting too much air in a balloon — pop! 🎈💥

Keep up or lose out

Practices change, be informed and adaptable to new standards. Keep those 👀 peeled on AJAX cache control developments.

Cache strategies for the win

Going server-side: A robust move

Opt for server-side cache management when possible. It's like having a bouncer (server) keep a keen eye instead of putting the DJ (frontend) in charge.

Add the right caching headers in your response to serve fresh content every time:

HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0


Professional over hacky: No debate

While appending a unique query string may break the cache, it might also break a sweat on your server. Abide by web standards for clean, maintainable code.

To cache or not to cache: That's a valid question!

Selectively cache non-critical, stale-resistant data to improve performance. Remember, caching is a tool, not an enemy. Wield it, don't yield it.

Consistency is king, test your queen

Different browsers, varied behaviors — always test your implementation across multiple browsers and versions. Remember, a highlander situation with browsers is yet to happen.