Implements ServiceInstance.getScheme() using InstanceInfo.

fixes gh-3727

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaServiceInstance.java

@@ -87,4 +87,8 @@ public class EurekaServiceInstance implements ServiceInstance {
 		return this.instance.getMetadata();
 	}
 
+	@Override
+	public String getScheme() {
+		return getUri().getScheme();
+	}
 }

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaServiceInstanceTests.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2013-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.springframework.cloud.netflix.eureka;
+
+import com.netflix.appinfo.InstanceInfo;
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+public class EurekaServiceInstanceTests {
+
+	@Test
+	public void getSchemeReturnsNonNull() {
+		InstanceInfo instanceInfo = InstanceInfo.Builder.newBuilder().setAppName("test")
+				.setHostName("myhost").setPort(8080).build();
+		EurekaServiceInstance instance = new EurekaServiceInstance(instanceInfo);
+		Assertions.assertThat(instance.getScheme()).isEqualTo("http");
+	}
+}