In Tomcat, GET works but not POST

I have a Tomcat server on Ubuntu. In Ubuntu, HTTPS works without a problem. On Tomcat however, if I go to a page on it in Chrome I get that this page is not secured right (on Tomcat, but in Ubuntu the pages are good).
Also, In Android, If I try to get to a page on Tomcat in GET it succeeds, but fails in POST with Handshake failed.
What can I do? Should I replicate my keystore somehow (I created the keystore for Tomcat on my computer)?

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