Remove / from prefix if present.

Fixes #2625

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/SimpleRouteLocator.java

@@ -138,6 +138,9 @@ public class SimpleRouteLocator implements RouteLocator, Ordered {
 		}
 		String targetPath = path;
 		String prefix = this.properties.getPrefix();
+		if(prefix.endsWith("/")) {
+			prefix = prefix.substring(0, prefix.length() - 1);
+		}
 		if (path.startsWith(prefix + "/") && this.properties.isStripPrefix()) {
 			targetPath = path.substring(prefix.length());
 		}

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/zuul/filters/SimpleRouteLocatorTests.java

@@ -69,6 +69,15 @@ public class SimpleRouteLocatorTests {
 		assertEquals("/test/testservicea/**", locator.getRoutes().get(0).getFullPath());
 	}
 
+	@Test
+	public void testPrefix() {
+		ZuulProperties properties = new ZuulProperties();
+		properties.setPrefix("/test/");
+		RouteLocator locator = new FilteringRouteLocator("/", properties);
+		properties.getRoutes().put("testservicea", new ZuulRoute("/testservicea/**", "testservicea"));
+		assertEquals("/test/testservicea/**", locator.getRoutes().get(0).getFullPath());
+	}
+
 	@Test
 	public void test_getMatchingRouteFilterRouteAcceptor() {
 		RouteLocator locator = new FilteringRouteLocator("/", this.zuul);