Hello @MuthuKumaranMurugaachari-MSFT , we found that APIM was removing the Cookie header as frontend (APIM) domain was different and backend URL domain was different. We managed it by having APIM under the same domain name (e.g apimgw.abcd.com , backendapi.abcd.com). It worked. Thanks for followup;
Cookies header are not passed from Azure API Manager to backend

Naman Shah
35
Reputation points
Hello ,
I am using Azure API Manager for integrating with Ping Identity manager. while sending the request , Ping is expecting cookies (these are session cookies) . I have set cookie in header but these values are not passed.
I am testing using deprecated dev portal and setting cookies headers in APIM
Both APIM and IDP are in different domains.
Is APIM trimming headers>?