WebFluxOutboundChannelAdapterParser silently ignores encoding-mode attribute if web-client attribute is present

[aljopainter]

In what version(s) of Spring Integration are you seeing this issue?

2.7.1 but I believe that 6.0.0 also has this problem

Describe the bug

When the web-client attribute is included in the declararation of a webflux:outbound-gateway using XML namespace support, the encoding-mode attribute will be ignored silently because the encoding mode from the UriBuilderFactory of the web-client will be used instead.

To Reproduce

Include an encoding-mode attribute and a web-client with a different encoding-mode within the UriBuilderFactory.

Expected behavior

An error or warning to signal that encoding-mode is ignored.

Sample

Similar to #3939

[artembilan]

Thank you for reporting this, @aljopainter !

Feel free to contribute the fix: https://github.com/spring-projects/spring-integration/blob/main/CONTRIBUTING.adoc.

[aljopainter]

I'll give it a shot.

[artembilan]

@aljopainter ,

any progress on this?
Apparently we are going to release 5.5.16 next Tuesday.
Probably would be great to have this in.

Thank you!

[artembilan]

Taking this myself: not time to wait for external contribution.