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https://issues.apache.org/jira/browse/PROTON-278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616324#comment-13616324
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Ted Ross commented on PROTON-278:
---------------------------------

An alternative API is to add a method on the pn_message_t:

    pn_message_expect_reply(pn_message_t *msg);

This removes the need to sequence the operation after setting the "to" address. 
 It simply annotates the message as needing a functional reply-to.  When the 
messages is subsequently sent, messenger can create or re-use the necessary 
subscriptions and set the message's reply-to field.

                
> Messenger - allow the application to control the use of the message reply-to 
> field.
> -----------------------------------------------------------------------------------
>
>                 Key: PROTON-278
>                 URL: https://issues.apache.org/jira/browse/PROTON-278
>             Project: Qpid Proton
>          Issue Type: Improvement
>          Components: proton-c
>    Affects Versions: 0.4
>            Reporter: Ken Giusti
>            Priority: Blocker
>             Fix For: 0.5
>
>
> Currently, messenger always sets the reply-to field in a sent message.
> This should be changed to allow the application to set the reply-to field 
> only when a reply is desired.  Messenger should be changed to not 
> unconditionally set this field.
> In order to set this field in the case of a client that has not established a 
> subscription, the client needs to be able to query messenger for the proper 
> value of the reply-to address.  A new api would need to be created for this.  
> Proposal:
> int pn_messenger_set_reply( pn_messenger_t *msgr,  pn_message_t *msg )
> Set the proper reply-to address in msg.  msg would need to have its "to" 
> address configured in order for this method to succeed.
> At least, I think the value for the reply-to may depend on the 'to' 
> address... I may be wrong about that....
> Opinions?

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