v30/glue - fix multipart/form-data

Author: commonism

aiopenapi3/v30/glue.py

@@ -424,14 +424,14 @@ def _prepare_body(self, data_: Optional["RequestData"], rbq: dict[str, str]) ->
                 assert media.schema_
                 raise TypeError((type(data_), media.schema_.get_type()))
 
+            # sending is unset here
             ctx = self.api.plugins.message.sending(
                 request=self,
                 operationId=self.operation.operationId,
                 sending=None,
                 headers=self.req.headers,
                 cookies=self.req.cookies,
             )
-            self.req.content = ctx.sending
             self.req.headers = ctx.headers
             self.req.cookies = ctx.cookies