this certificate is new to me in Spring Boot. I have Postman, and it successfully gets a response after I manually added the sample.key and sample.pem in the client certificate section. First, I turned off SSL certificate verification. Then, in the Client Certificate section, I set the Host to sandbox.sample.com, the CRT file to sample.pem, and the Key file to sample.key. With these settings, I got a successful response. However, when I tried to implement this in Spring Boot, I’m encountering an error.

I am using spring boot 3.2.