Sets the |stream_user_data| to the stream denoted by the
|stream_id|. If a stream user data is already set to the stream,
it is replaced with the |stream_user_data|. It is valid to specify
null in the |stream_user_data|, which nullifies the associated
data pointer.
It is valid to set the |stream_user_data| to the stream reserved by
PUSH_PROMISE frame.
This function returns 0 if it succeeds, or one of following
negative error codes:
Sets the |stream_user_data| to the stream denoted by the |stream_id|. If a stream user data is already set to the stream, it is replaced with the |stream_user_data|. It is valid to specify null in the |stream_user_data|, which nullifies the associated data pointer.
It is valid to set the |stream_user_data| to the stream reserved by PUSH_PROMISE frame.
This function returns 0 if it succeeds, or one of following negative error codes:
ErrorCode.INVALID_ARGUMENT The stream does not exist