The AMQP 1.0 spec states that message application property keys MUST be strings.
Under Python 2.x, the QMF client communicates with the broker using binary strings as keys in the application properties to pass QMF commands.
Two issues arise:
- The Python client should not accept binary keys in application properties
- The broker appears to accept this without warning or error. This could be considered undefined behavior, however.
The reproducer can be found in
QPID-8075. The attached Wireshark file shows the transfer in frame 18.