express returns 304 for IE repeative requests

Question

I\'m experiencing some strange behavior of ExpressJS. On second request to my node.js/express based API URL it always returns 304 Not Modified response code to IE. Other browser

Answer 1

The Cache-Control header is a workaround. The bug is in internet explorer's interpretation of the HTTP 1.1 spec for the header.

I added this to my route handler, which solved the problem. You also need a Last-Modified or ETag header, but express was already sending that for me.

res.setHeader("Expires", "-1");
res.setHeader("Cache-Control", "must-revalidate, private");

See: Make IE to cache resources but always revalidate