6 classes are annotated with FileSchemeHandler in Acquia Content Hub 8.2

EmptySchemeHandler in src/Plugin/FileSchemeHandler/EmptySchemeHandler.php

The file scheme handler for files without schemes.

HttpFileSchemeHandler in src/Plugin/FileSchemeHandler/HttpFileSchemeHandler.php

The file scheme handler for http schemes.

HttpsFileSchemeHandler in src/Plugin/FileSchemeHandler/HttpsFileSchemeHandler.php

File scheme handler for https schemes.

PrivateFileSchemeHandler in src/Plugin/FileSchemeHandler/PrivateFileSchemeHandler.php

File scheme handler for private files.

PublicFileSchemeHandler in src/Plugin/FileSchemeHandler/PublicFileSchemeHandler.php

The handler for files with a public file scheme.

S3FileSchemeHandler in modules/acquia_contenthub_s3/src/Plugin/FileSchemeHandler/S3FileSchemeHandler.php

S3 file scheme handler.