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HTTP/1.1 forces browsers to open multiple TCP connections and suffer head-of-line blocking. Tomcat's NIO2 connector can multiplex HTTP/2 streams over one TLS connection—if you configure it correctly.
When Tomcat reports “Failed to accept HTTP/2 connection: ALPN not available” or clients cannot upgrade, this guide walks through common causes, checks, and fixes to get HTTP/2 working on Tomcat 9+.
In a Tomcat 8.5+ NIO or NIO2 deployment, the connector attribute maxConnections limits the total number of sockets the connector will accept and process. Because idle keep-alive connections remain counted against that ceiling, a configuration that behaves correctly under light local traffic can exhaust the pool in production when clients maintain persistent
java
tomcat