Mobile Safari (iPhone) has 30 sec + latency for Javascript GET requests

Question

I am developing a mobile web application: www.bazmo.com. When I test the site, the latency of the GET JS requests can get up to 30 seconds. It basically seems broken to the user.

Here is how I recreate the error:

• Turn off cellular (wifi only)
• Clear History and Website Data
• Open safari and go to a page like www.bazmo.com/best/laptops
• Then click on the logo to go to the home page at which point it gets stuck for 30 seconds before the JS files load if they are not cached

I sometimes can catch it on Web Inspector and it just shows the JS not being loaded for 30 seconds.

What am I missing here.

I just use simple: to insert the files in.

Answer 1

I found a work around but not a permanent solution. The website uses Google App Engine.

The line:

script src="/javascript/categoryScript.js"> just did not work on safari mobile.

However the line:

script src="yourid.appspot.com/javascript/categoryScript.js"> does since it is trying to retrieve from another domain.

This helps provide a workaround but it is pretty bad form that I can't use the path from the domain itself.

I have been trying to find a way to make that work but no dice so far.

Answer 2

We had the same issue and problem was that our back-end returned 204 status and not 200 . BUT this issue was caused by using HTTP OPTIONS method and not GET (but it can be caused by the same thing).

Related reading:

• Huge delay on DELETE requests with 204 response and no content in Objective-C
• https://developer.apple.com/forums/thread/70226
• https://redmine.lighttpd.net/boards/2/topics/6874