How to use get method of REST API with v1.4 from Browser for service cloud

Summary

get method of REST API with v1.4 from Browser for service cloud

Content

Hi ,

Can any one tell me how to use 

https://test123.custhelp.com/services/rest/connect/v1.4/countries?q=lookupName='US'

I get following error

"type":"https://sandals--tst1.custhelp.com/services/rest/connect/exceptions/OSC-CREST-00025","title":"Bad Request","status":400,"detail":"Request does not contain OSvC-CREST-Application-Context header"

where as if I use v1.3 

https://test123.custhelp.com/services/rest/connect/v1.3/countries?q=lookupName='US'

i get results properly.

 

Please let me know.

 

Regards

Jagadeesh