How to add a URL parameter using a WSO2 Mediation Flow?

Question

I have successfully deployed a WSO2 API Manager. I am already using mediation flows for setting Header information, but now I am adding an API that requires a key to be set as an URL parameter. However I would like this to be added in the background so that the end-users don't have to worry about this key.

How can this be done in a Message Mediation Policy/Flow? Obviously the other parameters that are already present should stay untouched.

Thanks in advance

Answer 1

Hope you can access the key inside the synapse context. Then you can assign the key value to the uri.var object as below.

<property name="uri.var.key" expression="get-property('userParames.key')"/>

Now you can simply construct the endpoint as,

<endpoint>
   <http uri-template="https://{uri.var.hostname}:{uri.var.portnum}/abc/{uri.var.key}"/>
</endpoint>