diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/ForwardRoutingFilter.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/ForwardRoutingFilter.java
index b11966ec..50e81c8b 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/ForwardRoutingFilter.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/ForwardRoutingFilter.java
@@ -34,7 +34,7 @@ public class ForwardRoutingFilter implements GlobalFilter, Ordered {
 		URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);
 
 		String scheme = requestUrl.getScheme();
-		if (isAlreadyRouted(exchange) || !scheme.equals("forward")) {
+		if (isAlreadyRouted(exchange) || !"forward".equals(scheme)) {
 			return chain.filter(exchange);
 		}
 		setAlreadyRouted(exchange);
diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java
index 567f4732..ff5c8c60 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java
@@ -58,7 +58,7 @@ public class NettyRoutingFilter implements GlobalFilter, Ordered {
 		URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);
 
 		String scheme = requestUrl.getScheme();
-		if (isAlreadyRouted(exchange) || (!scheme.equals("http") && !scheme.equals("https"))) {
+		if (isAlreadyRouted(exchange) || (!"http".equals(scheme) && !"https".equals(scheme))) {
 			return chain.filter(exchange);
 		}
 		setAlreadyRouted(exchange);
diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebClientHttpRoutingFilter.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebClientHttpRoutingFilter.java
index 29b68fc5..b64d438d 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebClientHttpRoutingFilter.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebClientHttpRoutingFilter.java
@@ -58,7 +58,7 @@ public class WebClientHttpRoutingFilter implements GlobalFilter, Ordered {
 		URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);
 
 		String scheme = requestUrl.getScheme();
-		if (isAlreadyRouted(exchange) || (!scheme.equals("http") && !scheme.equals("https"))) {
+		if (isAlreadyRouted(exchange) || (!"http".equals(scheme) && !"https".equals(scheme))) {
 			return chain.filter(exchange);
 		}
 		setAlreadyRouted(exchange);
diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebsocketRoutingFilter.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebsocketRoutingFilter.java
index 976029e1..f7ac69ee 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebsocketRoutingFilter.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/WebsocketRoutingFilter.java
@@ -50,7 +50,7 @@ public class WebsocketRoutingFilter implements GlobalFilter, Ordered {
 		URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);
 
 		String scheme = requestUrl.getScheme();
-		if (isAlreadyRouted(exchange) || (!scheme.equals("ws") && !scheme.equals("wss"))) {
+		if (isAlreadyRouted(exchange) || (!"ws".equals(scheme) && !"wss".equals(scheme))) {
 			return chain.filter(exchange);
 		}
 		setAlreadyRouted(exchange);