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MassTransit–Reading a header using middleware

After blogging about adding a header yesterday, today let’s have a look at how we can read out this header in a generic way(if you only want to do this for a specific consumer, take a look at this blog post from last week).

We’ll start by creating the filter:

Now we need to find a way to register this filter in a generic way so that it is applied for every consumer. The trick is to create an IConsumerConfigurationObserver implementation. This observer will be applied for every consumer that is configured. A perfect fit for our use case:

Of course we are not there yet. We still need a way to tell MassTransit to apply this observer. This can be done by calling the ConnectConsumerConfigurationObserver method on the IBusFactoryConfigurator:

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