Matches http scheme regardless of case

Fixes gh-2218

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java

@@ -109,7 +109,7 @@ public class NettyRoutingFilter implements GlobalFilter, Ordered {
 
 		String scheme = requestUrl.getScheme();
 		if (isAlreadyRouted(exchange)
-				|| (!"http".equals(scheme) && !"https".equals(scheme))) {
+				|| (!"http".equalsIgnoreCase(scheme) && !"https".equalsIgnoreCase(scheme))) {
 			return chain.filter(exchange);
 		}
 		setAlreadyRouted(exchange);

spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/filter/NettyRoutingFilterTests.java

@@ -17,9 +17,14 @@
 package org.springframework.cloud.gateway.filter;
 
 import org.hamcrest.Matchers;
+import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import reactor.core.publisher.Mono;
+import reactor.netty.DisposableServer;
+import reactor.netty.http.server.HttpServer;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringBootConfiguration;
@@ -27,20 +32,29 @@ import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.cloud.gateway.route.RouteLocator;
 import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
+import org.springframework.cloud.gateway.test.BaseWebClientTests;
 import org.springframework.cloud.gateway.test.PermitAllSecurityConfiguration;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Import;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.util.SocketUtils;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-public class NettyRoutingFilterTests {
+public class NettyRoutingFilterTests extends BaseWebClientTests {
+
+	private static int port;
 
 	@Autowired
 	private ApplicationContext context;
 
+	@BeforeClass
+	public static void beforeAll() {
+		port = SocketUtils.findAvailableTcpPort();
+	}
+
 	@Test
 	@Ignore
 	public void mockServerWorks() {
@@ -50,6 +64,26 @@ public class NettyRoutingFilterTests {
 				.value(Matchers.lessThan(500));
 	}
 
+	@Test // gh-2207
+	public void testCaseInsensitiveScheme() {
+		DisposableServer server = HttpServer.create().port(port).host("127.0.0.1").route(
+				routes -> routes.get("/issue", (request, response) -> response.sendString(Mono.just("issue2207"))))
+				.bindNow();
+
+		try {
+			testClient.get().uri("/issue").exchange().expectStatus().isOk().expectBody()
+					.consumeWith(entityExchangeResult -> {
+						Assert.assertNotNull(entityExchangeResult);
+						Assert.assertNotNull(entityExchangeResult.getResponseBody());
+						String content = new String(entityExchangeResult.getResponseBody());
+						Assert.assertEquals("issue2207", content);
+					});
+		}
+		finally {
+			server.disposeNow();
+		}
+	}
+
 	@SpringBootConfiguration
 	@EnableAutoConfiguration
 	@Import(PermitAllSecurityConfiguration.class)
@@ -61,6 +95,7 @@ public class NettyRoutingFilterTests {
 					.route(p -> p.path("/mockexample")
 							.filters(f -> f.prefixPath("/httpbin"))
 							.uri("http://example.com"))
+					.route(p -> p.path("/issue").uri("HTTP://127.0.0.1:" + port))
 					.build();
 		}