[GitHub] [cordova-plugin-wkwebview-engine] breautek commented on issue #116: I can't load JSON from external server CORS is enabled *

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breautek commented on issue #116: I can't load JSON from external server CORS is enabled * 
URL: https://github.com/apache/cordova-plugin-wkwebview-engine/issues/116#issuecomment-545561037
 
 
   Debugging cors problems is very difficult because by design they hide useful error messages.
   
   You might see hints in your server logs. I've used [postman](https://www.getpostman.com/) so that I can send requests manually and see all the response details. Send the `OPTIONS` request to make sure the preflight response returns back the correct headers and content (body size should be exactly 0 bytes).
   
   It should also provide the following http headers:
   `Access-Control-Allow-Origin`
   `Access-Control-Allow-Methods`
   `Access-Control-Allow-Headers`
   
   Origin should be a wildcard because you cannot reference a null origin.
   Allowed methods should be a comma delimited list of http methods, e.g. `POST, GET, OPTIONS`
   Allowed headers should be a comma delimited list of allowed http headers... e.g:
   `Accept, Content-Type, X-Requested-With`
   
   Here is an example of my response headers:
   ![CORSheaders](https://user-images.githubusercontent.com/11200662/67420205-8bc69600-f5a4-11e9-8187-7bd9e43104a4.png)
   

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