| Note |
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Next time, have a look at https://letsencrypt.org/about/ |
You may wish to install tomcat to support secure connections over SSL, that is, via HTTPS.
...
To use a certificate from a certificate authority, follow instructions in the standard tomcat documentation, e.g. the section Installing a Certificate from a Certificate Authority on the page https://tomcat.apache.org/tomcat-8.05-doc/ssl-howto.html, under section Installing a Certificate from a Certificate Authority