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No 'Access-Control-Allow-Origin' Error from AGOL

Question asked by michael_porter on Aug 15, 2016
Latest reply on Sep 15, 2017 by dmgissvcs

When I try and load an application from AGOL - I get the following error in the console:


XMLHttpRequest cannot load No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://[domain]' is therefore not allowed access.


where [domain] is my company domain. The problem occurs only in Chrome and only in certain instances of Chrome. Security folk swear all installs are the same.


I see the threads talking about this when you are writing the JS (i.e. How to use Cross Origin Resource Sharing (CORS) from ArcGIS API Javascript Application? - Geographic Information Systems… ) . Any guesses or suggestions on how to handle / troubleshoot when you are using an AGOL app? Is it possible that this is a red herring and that it is actually masking another problem?