It likely indicates a local frontend calling its own backend during development or testing.
:
In 2021, Apache Solr users addressed the security implications of SOLR-11501, which necessitated disabling certain 'edismax' query parser features, particularly during upgrades to version 8.x. Concurrently, stricter browser security required developers to configure HTTPS for local development environments, including non-standard ports, to avoid connection warnings. For detailed information on the security changes, see Apache Solr Documentation . https localhost11501 2021