Getting html response in jira-stage APIs however jira prod APIs are working fine with same credentis

[Labdhi]

Hi, I am trying to hit many jira-stage APIs and getting html response instead of json. It was working fine before couple of days.

URL - 

https://jira-stage.<company-name>.com/rest/api/2/field

https://jira-stage.<company-name>.com/rest/api/2/project/OPIF/components

Method - GET

Authorization - Basic Auth token