Spring How to disable chunked transfer when using declarative http interface upload files?

related issue #20468

is there any way to disable chunked transfer or calculate encoded part's content-length when using declare http interface ?

e.g.

@HttpExchange("/V1.0")
interface Client {

    @PostExchange("upload")
    fun postFile(
      @RequestPart file: Resource, 
      //@RequestHeader("Content-Length") contentLength: Int
    ): Mono<String>

}

how can i set the correct header?

Comment From: snicoll

Thanks for getting in touch, but it feels like this is a question that would be better suited to Stack Overflow. As mentioned in the guidelines for contributing, we prefer to use the issue tracker only for bugs and enhancements. Feel free to update this issue with a link to the re-posted question (so that other people can find it) or add some more details if you feel this is a genuine bug.