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Motivation: The send window size is currently fixed by a macro at compile time. In order for users of the library to impact the send window size they would have to change a macro at compile time. The window size may be dynamic depending on the environment and deployment scheme. The library users currently have no way to change this parameter. Modifications: Add a new optional callback method which is called before data is sent to obtain the desired send window size. The callback return value will be subject to a range check for the current session, stream, and settings limits defined by flow control. Result: Library users have control over their send sizes.