URL should not be live when they're not 'real'.
For these please use correct formatting like:

`++http://che_host:8080/swagger++`

As a source of example, this is the list of URLs that we blacklist in CRW for link checking.

When one of these link appear to be live in the documentation, it should be reformatted upstream to deactivate links:

• http://&lt;keyckloak_host&gt;:5050/auth/realms/<em
• http://&lt;keyckloak_host&gt;:5050/auth/realms/<span
• http://$\{URL
• http://che_host:8080/swagger
• http://che-che.apps.cluster-fre-f0a2.fre-f0a2.openshiftworkshop.com
• http://codeready-ndp-test.apps.crw.codereadyqe.com/api/system/stop?shutdown=true
• http://host.net/path/project-src.zip</code
• http://host.net/path/project-src.zip</pre
• http://jaeger-collector:14268/api/traces
• https://download.jboss.org/jbosstools/static/jdt.ls/stable/java-0.46.0-1549.vsix[_https://download.jboss.org/jbosstools/static/jdt.ls/stable/java-0.46.0-1549.vsix
• https://github.com/acmecorp/backend.git</code
• https://github.com/acmecorp/backend.git</pre
• https://github.com/microsoft/vscode-java-debug/releases/download/0.19.0/vscode-java-debug-0.19.0.vsix[_https://github.com/microsoft/vscode-java-debug/releases/download/0.19.0/vscode-java-debug-0.19.0.vsix
• http://host.net/path/project-res.zip
• https://my-customregistry.com
• https://my-plug-in-registry/v3/plugins
• https://my-registry.com/v3/plugins/index.json
• https://raw.githubusercontent.com.../plugin/1.0.1/meta.yaml</code
• https://raw.githubusercontent.com.../plugin/1.0.1/meta.yaml</pre
• https://raw.githubusercontent.com/.../mongo-db.yaml
• https://raw.githubusercontent.com/.../nodejs-app.yaml