Http to https 301 redirect on app engine flexible env with Google-managed SSL (spring boot)

[Nicolas Lecrique]

I'm trying to make http to https redirect work with:

-Google managed SSL

-Spring boot app

-on flexible environment

-with custom domain

But from what I understand:

-htaccess doesn't work on app engine

-"secure: always" in app.yaml doesn't work in flexible environment

-gcloud proxy kills https connections

I can't find a way to make the redirect work properly

Would you have a code snippet to make this work ?

Or do i have to make a custom ssl certificate (which is what i would like to avoid) ?

I have dabbled with the following links but without success 

https://stackoverflow.com/questions/39709408/spring-boot-tomcat-http-https-301-redirects

https://stackoverflow.com/questions/42947627/spring-boot-forcing-https-cause-redirection-too-many-times-in-google-app-engine

Thank you!

[Kenworth (Google Cloud Platform)]

You are right, the 'secure: always' in app.yaml is already deprecated for GAE Flex environment. You can make the redirect work by using "X-Forwarded-Proto" header on your application code. See full article here.

[Nicolas Lecrique]

Thanks! I finally made it work by following : https://www.sothawo.com/2015/09/run-a-spring-boot-application-on-openshift-behind-https-only/ (which work as app engine from what i understand)