CORS -allow only specific clients -Sender rest adapter

[kaluvakirankumar]

Dear Team,
Greetings of the day!!!

Flow : Source -PI-SAP ECC
Need to authenticate the PO end point using(No auth)

Getting 200 OK If I maintain allow all clients - CORS.

Need to restrict for specific client.(Allow only specific clients).
As shown in image.

While checking with specific URL. getting the socket issue as
Error: tunneling socket could not be established, cause=read ECONNRESET.

Let me know if any information required
Provide me the possible way.
Note:Need to call the PI URL without credentials.
Suggest me how to proceed further .
I followed this link for CORS.
https://community.sap.com/t5/technology-blogs-by-members/cors-for-sap-po-rest-sender-adapter/ba-p/13...

1.certificate based authentication
2. CORS 

Regards,
saikiran kumar.