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import type { OutgoingHttpHeaders } from 'http'
/**
* Takes an object with a hostname property (like a parsed URL) and some
* headers that may contain Host and returns the preferred hostname.
* @param parsed An object containing a hostname property.
* @param headers A dictionary with headers containing a `host`.
*/
export function getHostname(
parsed: { hostname?: string | null },
headers?: OutgoingHttpHeaders
): string | undefined {
// Get the hostname from the headers if it exists, otherwise use the parsed
// hostname.
let hostname: string
if (headers?.host && !Array.isArray(headers.host)) {
hostname = headers.host.toString().split(':', 1)[0]
} else if (parsed.hostname) {
hostname = parsed.hostname
} else return
return hostname.toLowerCase()
}
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