Jsfiddle demonstrating IE11 difference talking to nginx vs google

Server NGINX
1

See, or please try:

If you see what I see in my IE11, when I press Start Test, and the
target
is nginx.org, the duration for each request goes slow/normal/slow/normal

But when I change nginx.org to google.com, the timing is
normal/normal/normal …

This only happens with IE11, other browsers behave normally
(they all do normal/normal/normal timings)

Why would IE11 be sensitive to an nginx server, and not to google ?
What is nginx doing that google is not doing…

2

Hello!

On Wed, Apr 29, 2015 at 01:13:37AM +1000, jb wrote:

(they all do normal/normal/normal timings)

Why would IE11 be sensitive to an nginx server, and not to google ?
What is nginx doing that google is not doing…

It looks like a combination of the following factors:

  • for some reason IE11 closes connections after JS requests to
    nginx.org in your test;

  • when IE11 have to open a connection, it opens 2 of them.

As a result, every second request request uses pre-cached connection
established previously, and it is fast. Others have to wait while
a connection is established.

No idea why IE closes connections, but it doesn’t happen on normal
use. May be some bug, or heuristics, or a security measure (as
the test triggers CORS errors).

–
Maxim D.
http://nginx.org/