Request
-------
MethodName: google.ads.googleads.v2.services.FeedItemService/MutateFeedItems
Endpoint: googleads.googleapis.com:443
Headers: {developer-token=REDACTED, x-goog-api-client=gl-java/1.8.0_131 gapic/ gax/1.45.0 grpc/1.21.0}
Body: customer_id: "3246533697"
operations {
  update {
    resource_name: "customers/3246533697/feedItems/102337163~79849167361"
    attribute_values {
      feed_attribute_id {
        value: 1
      }
      string_value {
        value: "http://www.example.com/discounts/hotel"
      }
    }
  }
  update_mask {
    paths: "resource_name"
    paths: "attribute_values"
  }
}

Response
--------
Headers: Metadata(content-disposition=attachment,content-type=application/grpc,request-id=hZArCWGM4qGaDGwj8oaJfQ,x-google-esf-cloud-client-params=client_project_number: 1077030547511 backend_service_name: "googleads.googleapis.com" backend_fully_qualified_method: "google.ads.googleads.v2.services.FeedItemService.MutateFeedItems" ,x-google-session-info=CIjr_eLOGBoEGBAoCzpsEhhnb29nbGVhZHMuZ29vZ2xlYXBpcy5jb20Yt-CXoKwfIkkxMDc3MDMwNTQ3NTExLTE0anN1bmdia3EzaXJjaDI5YmFqOTI4OXVnbGJ1OXJ2LmFwcHMuZ29vZ2xldXNlcmNvbnRlbnQuY29tSg86DTEvOGc1c2JZMjYxYn4,date=Mon, 16 Sep 2019 18:09:09 GMT,x-google-gfe-request-trace=aclgag12-v6:443,qjdj15:9874,/bns/ym/borg/ym/bns/adwords-simply/aw-webapi-esfproxy-prod.server/67,qjdj15:9874,aclgag12-v6:443,x-google-gslb-service=adwords-frontend-webapi-esfproxy,x-google-backends=[2002:a80:e484::]:4320,/bns/ym/borg/ym/bns/adwords-simply/aw-webapi-esfproxy-prod.server/67,qjdj15:9874,/bns/qj/borg/qj/bns/traffic-prod/shared-layer2-gfe/22,aclgag12-v6:443,x-google-dos-service-trace=main:adwords-frontend-webapi-esfproxy,main:shared-layer2-gfe,x-google-service=adwords-frontend-webapi-esfproxy,shared-layer2-grpc-aggregate,x-google-gfe-response-code-details-trace=response_code_set_by_backend,response_code_set_by_backend,x-google-gfe-response-body-transformations=chunked,chunked,x-google-shellfish-status=CA0gBEBG,alt-svc=quic=":443"; ma=2592000; v="46,43,39",x-google-gfe-service-trace=adwords-frontend-webapi-esfproxy,shared-layer2-grpc-aggregate)
Body: results {
  resource_name: "customers/3246533697/feedItems/102337163~79849167361"
}

Failure message: null
Status: Status{code=OK, description=null, cause=null}.
results {
  resource_name: "customers/3246533697/feedItems/102337163~79849167361"
}