When a response passes through Apigee from target server, the header Cache-Control gets dropped. What should be the reason behind this ?

[#1]

When a response from target server passes through Apigee, the header Cache-Control gets dropped. Is this related to proxy config or an internal settings?

[#2]

Apigee Edge only supports Cache-Control header in the response from backend servers.

http://docs.apigee.com/api-services/content/http-response-caching#cache-control

[#3]

Hi @Trung Lam : updated question ! I meant response only.

[#4]

While tracing my request sent to target server contains -> Cache-Control header response received from target server doesn't contain -> Cache-Control header

P.S. doing the same without apigee in between gives Cache-Control header back from response

[#5]

Sorry for the late reply, I've had other tickets that needed attention. Could you provide the apigee api proxy and target endpoint so I could examine the responses?