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Re: Requests being blocked client-side

Maxim Dounin
April 11, 2014 02:42PM
Hello!

On Fri, Apr 11, 2014 at 12:45:17PM -0400, justink101 wrote:

> I am seeing super strange behavior and I am absolutely stumped. If I open up
> two tabs in Google Chrome (34), and in the first refresh our application
> (foo.ourapp.com), which makes an ajax requests (via jQuery) that takes 20 or
> so seconds to complete. Then in the other new tab hit refresh on
> (foo.ourapp.com), the second tab blocks waiting until the ajax request on
> the first tab finishes. Inspecting Chrome developer tools shows:
>
> http://cl.ly/image/1s3V353o1v2c
>
> However, if I open up Firefox and load up (foo.ourapp.com) while the long
> running ajax request is firing in Chrome, it loads fine. Thus, I have
> determined that the client (Chrome) is blocking requests client-side.
> However, according to http://www.browserscope.org/?category=network it says
> Chrome supports 6 connections per hostname, which should be fine, as I am
> only making two requests.
>
> Any ideas on this? Pretty standard nginx config, with the following notable
> exceptions:
>
> listen 443 deferred ssl spdy;
>
> add_header Strict-Transport-Security max-age=31556926;
> add_header X-XSS-Protection "1; mode=block";
> add_header Access-Control-Allow-Origin $scheme://$account.myapp.com;
> add_header X-Frame-Options DENY;
> add_header X-Content-Type-Options nosniff;
>
> Running nginx/1.5.12 with SPDY 3.1.

The "6 connections per hostname" is for normal http, not spdy - as
spdy specification requires no more than 1 connection per server
(as spdy allows to multiplex multiple requests within a single
connection). An obvious thing to check is if the problem goes
away if you switch off spdy.

--
Maxim Dounin
http://nginx.org/

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Subject Author Posted

Requests being blocked client-side

justink101 April 11, 2014 12:45PM

Re: Requests being blocked client-side

Maxim Dounin April 11, 2014 02:42PM

Re: Requests being blocked client-side

justink101 April 16, 2014 04:58AM

Re: Requests being blocked client-side

Lee Valentine April 16, 2014 05:04AM

Re: Requests being blocked client-side

justink101 April 16, 2014 06:58PM

Re: Requests being blocked client-side

justink101 April 16, 2014 10:24PM



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