Bad Request This combination of host and port requires TLS.

Describe the bug I am using spring-cloud-gcp-starter with custom domain + custom certificate(not google managed). Although the configuration in app.yaml works fine but at the backend the redirection doesn’t work as intended as I am seeing the error:- Bad Request This combination of host and port requires TLS. on a HTTPS connection. This is my app.yaml

runtime: java11
instance_class: F2
handlers:
  - url: /.*
    script: auto
    secure: always
    redirect_http_response_code: 301

And the related application.properties

server.ssl.enabled=true
server.ssl.protocol=TLS
server.port=${PORT:8080}
server.ssl.client-auth=none
server.ssl.key-store=classpath:data/someKeystore.p12
server.ssl.key-store-password=somePassword
server.ssl.key-store-type=PKCS12
server.ssl.key-alias=something
server.ssl.key-password=anotherpassword

Sample I have tested the app locally, for some reason the redirection on localhost doesn’t work at all but if I add https the request processes without the ‘Bad Request’ error. To reproduce: Get a Cert from CA> Add it to GAE> Use the same cert to Configure Spring boot server for SSL> Deploy the app> See the error.

[meltsufin]

@Guneetgstar This is a great example of a very valuable community contribution! Hopefully, others will find this thread when they encounter the same problem before it’s fixed, and won’t have to spend time on it like you did. Thanks again!

[Guneetgstar]

Yeah this seems to me too as I have messed a whole day to find/fix this small requisite with no success and spent more time testing alternatives. What made me think that its rather a spring-cloud-gcp related issue is that I didn’t find a single issue regarding this with GAE and its been here for years whereas spring-cloud-gcp has less users as compared to GAE itself which makes one not to expect a bug from GAE at least.

I have filed a bug on the link you given to issuetacker. I guess you can finally close it now.