Improve HttpServiceMethod support for Kotlin suspending functions returning Flow
          #35718
        
          
      
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
In #35473 (comment) it was noted that the HTTP Interface does not support Kotlin suspending functions returning
Flow.While this technically works, the issue is that such invocations are handled via
ReactorHttpExchangeAdapter#exchangeForBodyMonoinstead ofReactorHttpExchangeAdapter#exchangeForBodyFlux.This PR fixes the issue by adapting
HttpServiceMethodin a similar way to the improvements made toRSocketServiceMethodin #35473.cc @sdeleuze