On 06/22/2011 07:21 AM, Zhemzhitsky Sergey wrote:
Hi there,
I'm trying to investigate headers exchange type.
By means of qpid-config tool I was able to create a binding using the following
command:
qpid-config bind myExchange.headers myQueue bindingKey any header1=header1Val,
header2=header2Val
If not to specify bindingKey an error occurs.
I'm wondering why do I need to specify binding key for exchange of type
"headers"?
That's a result of the tool using positional arguments and not being
clever enough to detect that the binding key was not specified.
You can have a null binding key by using e.g.
qpid-config bind myExchange.headers myQueue '' any header1=header1Val,
header2=header2Val
The binding key for the headers exchange is used only for identity. You
need it when unbinding and it must be unique for a given exchange and
queue pairing. Null is valid value, but the uniqueness still applies so
you can't have more than one binding between the same queue and exchange
with a null binding key.
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