WDYT about stringifying as late as possible here:
```scala
val absolute = if (uri.isAbsolute) {
uri.withPort(uri.effectivePort)
} else {
val apiPort = WhiskProperties.getEdgeHostApiPort
val protocol = if (apiPort == 443) "https" else "http"
Uri.from(scheme = protocol, host = host, port = apiPort)
}
absolute.toString
```
Very minor, but it prevents manual concatenations.
[ Full content available at:
https://github.com/apache/incubator-openwhisk/pull/4004 ]
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