transport/http: User agent is ignored

[enocom]

In google.golang.org/api/transport/http.NewClient, execution eventually reaches this code:

google-api-go-client/transport/http/dial.go

Lines 101 to 107 in 88e8ed9

	headers := http.Header{}
	if ds.QuotaProject != "" {
	headers.Set("X-goog-user-project", ds.QuotaProject)
	}
	if ds.RequestReason != "" {
	headers.Set("X-goog-request-reason", ds.RequestReason)
	}

Note that the user agent isn't set, whereas it is in the other code path:

google-api-go-client/transport/http/dial.go

Line 164 in 88e8ed9

userAgent: settings.UserAgent,

[enocom]

Related to GoogleCloudPlatform/alloydb-go-connector#661

[kurtisvg]

Hey -- this is a P0 for us on the Databases side, as it means we can't track usage in our product through the AlloyDB Go connector.