currently i tryed to call external service using apex while i try to call API facing below exception "Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable"I got referance ralated this error https://help.salesforce.com/s/articleView?id=000384438&type=1 , i followed all the steps mentioned in blog but still facing same issue.
same api calling from the postman its working fine so what is the problem and how i can resolved this error ?
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