What kind of network error is Chrome encountering when 'Status = (failed)' or 'Status = (canceled)'

Question

I'm trying to send requests to google ads server and openx but they fails in the browser and I cant figure out why. There are times that the requests pass but most of the time they fails. The behaviour is random and I cant understand why they fails sometime. I run this in clean browser with no extensions (like Ad blocker etc.)

This is how the output in my chrome network tab looks like:

Name    Method  Status      Type                Initiator   Size    Time
...     POST    200         application/json    odap.js:2   543 B   188 ms  
...     GET     200         image/png           odap.js:2   439 B   4 ms    
...     POST    200         application/json    odap.js:2   1.7 KB  301 ms  
...     GET     200         image/gif           Other       7.4 KB  4 ms    
...     GET     (canceled)                      Other       0 B     76 ms   
...     GET     (failed)                        Other       0 B     34 ms   
...     GET     200         image/gif           Other       316 B   40 ms   
...     POST    302         application/x-www-form-urlencoded   

This is screenshot of my chrome network tab - http://postimg.org/image/7zrm1nhln/

Answer 1

Status = cancelled

• What does status=canceled for a resource mean in Chrome Developer Tools?

Status = failed

• What kind of network error is Chrome encountering when 'Status = (failed)' and 'Type = undefined'