Cannot test-invoke from API Gateway console

[JackKelly-Bellroy]

When you test-invoke an endpoint (from the API Gateway console), AWS doesn't send a real IP address, which causes the following error:

Wed May 26 01:39:03 UTC 2021 : Endpoint response body before transformations: {"errorType":"User","stackTrace":[],"errorMessage":"Network.Socket.getAddrInfo (called with preferred socket type/protocol: AddrInfo {addrFlags = [AI_NUMERICHOST], addrFamily = AF_INET, addrSocketType = Stream, addrProtocol = 0, addrAddress = 0.0.0.0:0, addrCanonName = Nothing}, host name: Just \"test-invoke-source-ip\", service name: Just \"443\"): does not exist (Name or service not known)"}

This breaks the getAddrInfo call. If they're going to send a dummy IP, we should emit a wai Request with a dummy IP.

[Unisay]

I've seen this one when I simulated a gateway proxy request - I manufactured a dummy one full of mempty values.