introduce MINIO_BROWSER_REDIRECT env to enable/disable auto-redirect (#18025)

cmd/common-main.go

@@ -150,7 +150,7 @@ func minioConfigToConsoleFeatures() {
 		}
 	}
 	// pass the console subpath configuration
-	if value := env.Get(config.EnvBrowserRedirectURL, ""); value != "" {
+	if globalBrowserRedirectURL != nil {
 		subPath := path.Clean(pathJoin(strings.TrimSpace(globalBrowserRedirectURL.Path), SlashSeparator))
 		if subPath != SlashSeparator {
 			os.Setenv("CONSOLE_SUBPATH", subPath)
@@ -649,6 +649,7 @@ func handleCommonEnvVars() {
 			}
 			globalBrowserRedirectURL = u
 		}
+		globalBrowserRedirect = env.Get(config.EnvBrowserRedirect, config.EnableOn) == config.EnableOn
 	}
 
 	if serverURL := env.Get(config.EnvMinIOServerURL, ""); serverURL != "" {

cmd/generic-handlers.go

@@ -152,7 +152,7 @@ func setBrowserRedirectMiddleware(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		read := r.Method == http.MethodGet || r.Method == http.MethodHead
 		// Re-direction is handled specifically for browser requests.
-		if guessIsBrowserReq(r) && read {
+		if guessIsBrowserReq(r) && read && globalBrowserRedirect {
 			// Fetch the redirect location if any.
 			if u := getRedirectLocation(r); u != nil {
 				// Employ a temporary re-direct.

cmd/globals.go

@@ -152,6 +152,9 @@ var (
 	// and it is automatically deduced.
 	globalBrowserRedirectURL *xnet.URL
 
+	// Disable redirect, default is enabled.
+	globalBrowserRedirect bool
+
 	// This flag is set to 'true' when MINIO_UPDATE env is set to 'off'. Default is false.
 	globalInplaceUpdateDisabled = false
 

internal/config/constants.go

@@ -62,6 +62,7 @@ const (
 	EnvMinIOCallhomeFrequency = "MINIO_CALLHOME_FREQUENCY"
 
 	EnvMinIOServerURL         = "MINIO_SERVER_URL"
+	EnvBrowserRedirect        = "MINIO_BROWSER_REDIRECT" // On by default
 	EnvBrowserRedirectURL     = "MINIO_BROWSER_REDIRECT_URL"
 	EnvRootDriveThresholdSize = "MINIO_ROOTDRIVE_THRESHOLD_SIZE"
 	EnvRootDiskThresholdSize  = "MINIO_ROOTDISK_THRESHOLD_SIZE" // Deprecated Sep 2023