argument

The key-value pairs that are configured for the headers attributes of a message. Default value: x-match:all. Valid values:

• x-match:all: A headers exchange routes a message to a queue only if all binding attributes of the queue except for x-match match the headers attributes of the message.

• x-match:any: A headers exchange routes a message to a queue if one or more binding attributes of the queue except for x-match match the headers attributes of the message.

• NOTE: If the exchange type is not 'HEADERS', the argument should not been set, otherwise, there are always "forces replacement" changes.