Adds option to disable netty http client pooling.

spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java

@@ -110,6 +110,7 @@ import org.springframework.web.reactive.socket.server.support.HandshakeWebSocket
 
 import com.netflix.hystrix.HystrixObservableCommand;
 
+import static org.springframework.cloud.gateway.config.HttpClientProperties.Pool.PoolType.DISABLED;
 import static org.springframework.cloud.gateway.config.HttpClientProperties.Pool.PoolType.FIXED;
 
 import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
@@ -156,15 +157,17 @@ public class GatewayAutoConfiguration {
 				// configure pool resources
 				HttpClientProperties.Pool pool = properties.getPool();
 
-				PoolResources poolResources;
-				if (pool.getType() == FIXED) {
-					poolResources = PoolResources.fixed(pool.getName(),
+				if (pool.getType() == DISABLED) {
+					opts.disablePool();
+				} else if (pool.getType() == FIXED) {
+					PoolResources poolResources = PoolResources.fixed(pool.getName(),
 							pool.getMaxConnections(), pool.getAcquireTimeout());
+					opts.poolResources(poolResources);
 				} else {
-					poolResources = PoolResources.elastic(pool.getName());
+					PoolResources poolResources = PoolResources.elastic(pool.getName());
+					opts.poolResources(poolResources);
 				}
 
-				opts.poolResources(poolResources);
 
 				// configure proxy if proxy host is set.
 				HttpClientProperties.Proxy proxy = properties.getProxy();

spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/config/HttpClientProperties.java

@@ -61,7 +61,7 @@ public class HttpClientProperties {
 
 	public static class Pool {
 
-		public enum PoolType { ELASTIC, FIXED }
+		public enum PoolType { ELASTIC, FIXED, DISABLED }
 
 		/** Type of pool for HttpClient to use, defaults to ELASTIC. */
 		private PoolType type = PoolType.ELASTIC;