In some cases, the remote resource that Artifactory's remote repository uses supports remote browsing. In these cases, you can browse the contents of these repositories directly from the Artifactory UI.
For example, JCenter and Maven Central support remote repository browsing. However, Docker Hub does not. In the example below, Artifactory is showing the contents of JCenter:
The remote site usually has to have a particular format, and needs to support HEAD requests. Artifactory performs a HEAD request to verify a remote resource is available.
You can check the compatibility of a remote site by comaring its remote structure. If it appears similar to JCenter.bintray.com it should be viewable in Artifactory's UI.