[BUG] the plugin can't support multi-level URLs case

[TonnyAirFly]

System information

• Software version : Confluence 8.5.8
• Machine information: cpu 16 cores and memory 32GB

Describe the current behavior
In our Confluence test system, Confluence is deployed under Tomcat and configured as xx:1990/confluence. The plug-in cannot send access information.

Describe the expected behavior
Want to support xx:1990/confluence case.

Standalone code to reproduce the issue
N/A

Other info / logs
N/A