encoding-mode attribute of http:outbound-gateway is silently ignore if rest-template is present #3938
Description
In what version(s) of Spring Integration are you seeing this issue?
Version 6.0.0-SNAPSHOT and previous
Describe the bug
In http:outbound-gateway, when "encoding-mode" and "rest-template" attributes are both present, "encoding-mode" is silently ignored
To Reproduce
Create an http:output-gateway with both attributes "rest-template" and "encoding-mode" and set, for example, "encoding-mode" to None to discover that the URL is nonetheless encoded.
Expected behavior
Get an error from method "HttpAdapterParsingUtils.verifyNoRestTemplateAttributes". This is as simple as adding "encoding-mode" to the list of attributes in the class member SYNC_REST_TEMPLATE_REFERENCE_ATTRIBUTES