This extension hook has no documentation on MediaWiki.org. Please improve MediaWiki by adding documentation to it. See Template:ExtensionHook for instructions on how to do it.

For examples of extensions using this hook, see Category:ExternalDataBeforeWebCall extensions . Category:Extension hooks#ExternalDataBeforeWebCall Category:Undocumented extension hooks#ExternalDataBeforeWebCall Category:Extension hooks provided by External Data Category:Extension hooks#ExternalDataBeforeWebCall Category:Undocumented extension hooks#ExternalDataBeforeWebCall Category:Extension hooks provided by External Data