Configuring HTTP/2 for Tomcat 8.5 and above

Tomcat 8.5 and above support HTTP/2 (see https://tomcat.apache.org/tomcat-8.5-doc/config/http2.html).

In a standalone installation you need to configure an element UpgradeProtocol inside the Connector in server.xml:

<Connector port="8443" protocol="..." sslImplementationName="...">
    <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol"/>
...
</Connector>

These properties control the generation of the server.xml configuration file.

Remark: The file generation doesn't have any logic nor it doesn't do any validation. It's just an XML replacement and adding mechanism.

Connector attributes

cargo.tomcat.connector.protocolClass

TomcatPropertySet.CONNECTOR_PROTOCOL_CLASS

HTTP/1.1

cargo.tomcat.connector.sslImplementationName

TomcatPropertySet.CONNECTOR_SSL_IMPLEMENTATION_NAME

org.apache.tomcat.util.net.openssl.OpenSSLImplementation

UpgradeProtocol element

cargo.tomcat.connector.httpUpgradeProtocol

TomcatPropertySet.CONNECTOR_HTTP_UPGRADE_PROTOCOL