Confusion about amqplib properties

    Amqplib 0.6.1 introduces some properties when sending/receiving message in Message class. But when serializing “longstr” type properties, it did not use “utf-8”. So be careful to use its “application_headers” property, all keys in this diction will encode into “utf-8”, and values remain plain string.

Code snippets from amqplib 0.6.1:

def read_shortstr(self):
        """
        Read a utf-8 encoded string that's stored in up to
        255 bytes.  Return it decoded as a Python unicode object.

        """
        self.bitcount = self.bits = 0
        slen = unpack('B', self.input.read(1))[0]
        return self.input.read(slen).decode('utf-8')


    def read_longstr(self):
        """
        Read a string that's up to 2**32 bytes, the encoding
        isn't specified in the AMQP spec, so just return it as
        a plain Python string.

        """
        self.bitcount = self.bits = 0
        slen = unpack('>I', self.input.read(4))[0]
        return self.input.read(slen)