fixing small things

main.go

@@ -23,7 +23,6 @@ import (
 var webFS embed.FS
 
 const (
-	defaultRPCURL              = "http://192.168.20.22:3210/transmission/rpc"
 	envTransmissionURL         = "TRANSMISSION_URL"
 	envTransmissionRPCUsername = "TRANSMISSION_RPC_USERNAME"
 	envTransmissionRPCPassword = "TRANSMISSION_RPC_PASSWORD"
@@ -62,11 +61,7 @@ func NewClientFromEnv() (*Client, error) {
 }
 
 func configuredRPCURL() string {
-	rpcURL := strings.TrimSpace(os.Getenv(envTransmissionURL))
-	if rpcURL == "" {
-		return defaultRPCURL
-	}
-	return rpcURL
+	return strings.TrimSpace(os.Getenv(envTransmissionURL))
 }
 
 func optionalEnv(name string) string {
@@ -78,6 +73,9 @@ func optionalEnv(name string) string {
 }
 
 func validateRPCURL(raw string) error {
+	if raw == "" {
+		return fmt.Errorf("%s environment variable must be set", envTransmissionURL)
+	}
 	parsed, err := url.Parse(raw)
 	if err != nil {
 		return fmt.Errorf("%s is invalid: %w", envTransmissionURL, err)