In this case we could set variable var://service/mpgw/skip-backside to 1 for a Multi-Protocol Gateway service.
This makes the MPGW service a loopback service and we could provide dummy backend response data.
The difference to connecting to a real backend is just the latency -- no real backend has 0 latency.
While there is no specific DataPower command to add latency to a service or stylesheet (like Unix "sleep" command)
we can use a simple workaround I learned from a colleague yesterday.
Just try to open a network connection to a non-existent IP address with <dp:url-open ...> and specify the timeout you are interested in:
<!-- do 10 second delay -->
<dp:url-open target="http://188.8.131.52" response="ignore" timeout="10" />
This has the big advantage that it does not affect CPU-usage (non-active wait).
Today I learned that non-existant IP adresses must be chosen carefully, don't use 10.0.1.0 for that.
Find the details in this developerWork Forum thread: