root: initial merging of outpost and main project

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/outpost/proxy/utils.go

@@ -0,0 +1,20 @@
+package proxy
+
+import (
+	"net"
+	"net/http"
+)
+
+var xForwardedHost = http.CanonicalHeaderKey("X-Forwarded-Host")
+
+func getHost(req *http.Request) string {
+	host := req.Host
+	if req.Header.Get(xForwardedHost) != "" {
+		host = req.Header.Get(xForwardedHost)
+	}
+	hostOnly, _, err := net.SplitHostPort(host)
+	if err != nil {
+		return host
+	}
+	return hostOnly
+}