Document HTTP range request constraints

See gh-35227

Signed-off-by: Fabrice Bibonne <fabrice.bibonne@gmail.com>

framework-docs/modules/ROOT/pages/web/webmvc/mvc-range.adoc

@@ -15,6 +15,8 @@ xref:web/webmvc-functional.adoc#webmvc-fn-resources[serves a `Resource`]. `Range
 support is also transparently handled when serving
 xref:web/webmvc/mvc-config/static-resources.adoc[static resources].
 
+NOTE: To be handled transparently, the `Resource` object must not be a `InputStreamResource` and, in case of an annotated controller returning `ResponseEntity<Resource>`, the status of the response must be 200.
+
 The underlying support is in the `HttpRange` class, which exposes methods to parse
 `Range` headers and split a `Resource` into a `List<ResourceRegion>` that in turn can be
 then written to the response via `ResourceRegionHttpMessageConverter`.