firewall rules. A WebSocket interaction begins with an HTTP request that uses the HTTP Upgrade header to upgrade or, in this case, to switch to the WebSocket protocol. The following example shows such interaction: GET /spring-websocket-portfolio/portfolio HTTP/1.1 Host: localhost:8080 Upgrade: websocket ① Connection: Upgrade ② Sec-WebSocket-Key: Uc9l9TMkWGbHFD2qnFHltg== Sec-WebSocket-Protocol: v10.stomp stomp, v11.stomp Sec-WebSocket-Version: 13 Origin: http://localhost:8080 ① The Upgrade header. ② Using the Upgrade connection. Instead of the usual 200 status code, a server with WebSocket support returns

annotation. This is a best practice and the recommended solution for regressions encountered in a 5.3 upgrade. Alternatively, you may specifically handle e.g. the resulting MissingPathVariableException firewall rules. A WebSocket interaction begins with an HTTP request that uses the HTTP Upgrade header to upgrade or, in this case, to switch to the WebSocket protocol. The following example shows such interaction: GET /spring-websocket-portfolio/portfolio HTTP/1.1 Host: localhost:8080 Upgrade: websocket ① Connection: Upgrade ② Sec-WebSocket-Key: Uc9l9TMkWGbHFD2qnFHltg== Sec-WebSocket-Protocol: v10.stomp

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.32.0 Full release notes 15.1.1. Highlights • Mirrored Core Messages can now be sent on their native

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.31.1 Full release notes 15.1.1. Highlights • Bug Fixes and component upgrades 15.2. 2.31.0 Full

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.31.2 Full release notes 15.1.1. Highlights • Bug Fix 15.2. 2.31.1 Full release notes 15.2.1. Highlights

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.31.0 Full release notes 15.1.1. Highlights • Introduced an interactive shell for running CLI command

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.37.0 Full release notes 15.1.1. Highlights • The environment variables of the CLI commands other

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.36.0 Full release notes 15.1.1. Highlights • Numerous dependency upgrades triggered by integration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.35.0 Full release notes 15.1.1. Highlights • There was a regression in broker replication in regard

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 16.1. General Upgrade Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from the previous version.  If the upgrade spans multiple versions then the steps from each version need to be followed in order.  Follow the general upgrade procedure outlined in the Upgrading the the Broker chapter in addition to any version-specific upgrade instructions outlined here. 15.1. 2.34.0 Full release notes 15.1.1. Highlights • Extensive resiliency tests and hardening on Mirroring