x-forwarded-proto header missing in ALB

Question

Hi,
Created ALB using ingress controller. Ingress.yaml has all the relevant annotations. Initial flow works fine i.e. browser->https://url->R53->public hosted zone-> public ALB-> service->pod
However, when integrate the service with SAML IDP, after successful authentication, SAML assertion fails as returned/redirect url to service is http:// rather than https://
AWS docs mentioned, ALB supports x-forwarded headers but not able to get the client's original protocol as x-forwarded header is missing.  Look for help to know how to get x-forwarded-proto header in the request? Any specific annotation to get this? Thanks !!

Answer

Hello,

There is a feature where you can either remove, append, or preserve x-forwarded header but currently it is only supported for x-forwarded-for and x-forwarded-proto is unaffected. If you are using, authentication feature for SAML authentication, in that case it won't work or your configuration has to be - ALB - auth -> cognito ---> SAML.

[+] HTTP headers and Application Load Balancers - X-Forwarded-For - https://docs.aws.amazon.com/elasticloadbalancing/latest/application/x-forwarded-headers.html#x-forwarded-for

x-forwarded-proto header missing in ALB

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