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web/core/modules/hal/config/install/hal.settings.yml

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+# Set the domain for HAL type and relation links.
+# If left blank, the site's domain will be used.
+link_domain: ~
+# Before Drupal 8.5, the File entity 'uri' field value was overridden to return
+# the absolute file URL instead of the actual (stream wrapper) URI. The default
+# for new sites is now to return the actual URI as well as a root-relative file
+# URL. Enable this setting to use the previous behavior. For existing sites,
+# the previous behavior is kept by default.
+# @see hal_update_8501()
+# @see https://www.drupal.org/node/2925783
+bc_file_uri_as_url_normalizer: false

web/core/modules/hal/config/schema/hal.schema.yml

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+# Schema for the configuration files of the HAL module.
+hal.settings:
+  type: config_object
+  label: 'HAL settings'
+  mapping:
+    link_domain:
+      type: string
+      label: 'Domain of the relation'
+    bc_file_uri_as_url_normalizer:
+      type: boolean
+      label: 'Whether to retain pre Drupal 8.5 behavior of normalizing the File entity "uri" field value to an absolute URL.'