Improve TXT record parsing

internal/client.go

@@ -37,7 +37,7 @@ func Discover(service string, host string) (string, error) {
 	if len(addrs) > 0 {
 		srvTarget := strings.TrimSuffix(addrs[0].Target, ".")
 
-		// If we found one, check for TXT records specifying the path
+		// If we found one, check for a TXT record specifying the path
 		if srvTarget != "" {
 			txtRecs, err := net.LookupTXT(fmt.Sprintf("_%vs._tcp.%v", service, host))
 			if dnsErr, ok := err.(*net.DNSError); ok {
@@ -49,10 +49,11 @@ func Discover(service string, host string) (string, error) {
 			}
 
 			for _, txtRec := range txtRecs {
-				// This is not correct according to RFC 6763, but LookupTXT merges all constituent strings together
+				// This is not correct according to RFC 6763 sections 6.3 to 6.5,
+				// but LookupTXT merges all constituent strings together
 				for _, txtRecKeyVal := range strings.Split(txtRec, " ") {
-					if strings.HasPrefix(txtRecKeyVal, "path=") {
-						path = strings.TrimPrefix(txtRecKeyVal, "path=")
+					if strings.HasPrefix(strings.ToLower(txtRecKeyVal), "path=") {
+						path = txtRecKeyVal[5:]
 						break
 					}
 				}