In this article I describe how to return a HTTP 404 (resource) Not Found with a REST integration that on its turn calls another REST service that returns a 404.
When an integration invokes the GET action on a REST service that returns a 404, the integration will raise an APIInvocationError. As a result, the integration on its turn will respond with a HTTP 500 error, which is typically not what you want.
Embedding the invoke in a Scope gives you the option to add a Fault Handler:

Chosing the APIInvocationError gives you the option to configure how any APIInvocationError should be handled. As you can see below, I have configured it to use a Switch, where the top flow will make it return a 404: Read the complete article here.

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