The previous fix #09f1f7 did not actually address the issue but only moved it further down, so instead of the subscribe(), it was consuming it inside the MultipartHttpMessageWriter#write method which returned this.body.then(), and then again for the actual request body writing. In this commit MultipartHttpMessageWriter#write returns Mono.empty() since we don't actually want to write the part content from there, but only want to access it as soon as it is availabele, for writing to the request body. Issue: SPR-16402
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