Mysterious ~ 1 minute delay in HTTP POST between browser and Nginx

Recently, we have encountered a very strange but very consistent delay in sending mail from client javascript to our server.

Here is our technology stack, front and back:

• Custom javascript client code
• Backbone.js
• Custom implementation of Backbone.sync ()
• jQuery.ajax () (1.7.2)
• XmlHttpRequest
• Browser (tested on both Firefox and Chrome)
• the Internet
• Nginx interface
• Intranet (via Nginx http://upstream)
• Nginx backend
• Gunicorn (via Nginx unix://upstream socket)
• Django 1.4
• Django-tastypie

(Side note: Do you ever just step back from how complicated web development is?)

Here's the timeline:

• .save() Backbone APIModel.
• .sync() client.send(), $.ajax().
• XmlHttpRequest POST. dev Network, .
• HTTP- Nginx, django-tastypie.
• Tastypie , 201 CREATED Location, .
• Nginx () .
• 1,1 elapse,, - Network.
• .
• jQuery xhr
• API- 201 GET .
• , GET , $.Deferred() , .

:

• GET PUT .
• Nginx HTTP- POST, , .
• 201 GET .
• 1,1 . console.time(), , 65 000 .
• . , .

, :

• Nginx , .
• jQuery.

, , , , , :

• -

# 3. ?