import.rb in flipper-api-1.3.0.pre

- old
+ new

@@ -8,11 +8,14 @@
       module Actions
         class Import < Api::Action
           route %r{\A/import/?\Z}
 
           def post
+            # Rack 3 changed the requirement to rewind the body, so we can't assume it is rewound,
+            # so rewind before under Rack 3+ and after under Rack 2.
+            request.body.rewind if Gem::Version.new(Rack.release) >= Gem::Version.new('3.0.0')
             body = request.body.read
-            request.body.rewind
+            request.body.rewind if Gem::Version.new(Rack.release) < Gem::Version.new('3.0.0')
             export = Flipper::Exporters::Json::Export.new(contents: body)
             flipper.import(export)
             json_response({}, 204)
           rescue Flipper::Exporters::Json::InvalidError
             json_error_response(:import_invalid)