{
    "requestType": "openrtb2-web",
    "incomingRequest": {
        "ortbRequest": {
            "id": "some-request-id",
            "site": {
                "page": "test.somepage.com"
            },
            "imp": [
                {
                    "id": "imp-id-1",
                    "banner": {
                        "format": [
                            {
                                "w": 300,
                                "h": 600
                            }
                        ]
                    },
                    "ext": {
                        "prebid": {
                            "bidder": {
                                "appnexus": {
                                    "placementId": 1
                                },
                                "audienceNetwork": {
                                    "placementId": "some-placement"
                                }
                            },
                            "imp": {
                                "appnexus": {
                                    "id": "imp-id-1-appnexus"
                                },
                                "audienceNetwork": {
                                    "banner": {
                                        "format": [
                                            {
                                                "w": -1,
                                                "h": -1
                                            }
                                        ]
                                    }
                                }
                            }
                        }
                    }
                }
            ]
        }
    },
    "outgoingRequests": {},
    "response": {
        "error": "merging bidder imp first party data for imp imp-id-1 results in an invalid imp: [request.imp[0].banner.format[0].w must be a positive number]"
    }
}