Strip prefixes from zuul routes by default

The default behaviour is now to strip the prefixes (global and
route-specific) by default. E.g.

zuul:
  prefix: /api
  routes:
    customers: /customers/**

Will forward /api/customers/101 to /101 on the customers service

See gh-43

docs/src/main/asciidoc/spring-cloud-netflix.adoc

@@ -500,10 +500,26 @@ Zuul's rule engine allows rules and filters to be written in essentially any JVM
 [[netflix-zuul-reverse-proxy]]
 === Embedded Zuul Reverse Proxy
 
-Spring Cloud has created an embedded Zuul proxy to ease the development of a very common use case where a UI application wants to proxy calls to one or more back end services.  To enable it, annotate a Spring Boot main class with `@EnableZuulProxy`, and this forwards local calls to the appropriate service.  By convention, a service with the Eureka ID "users", will receive requests from the proxy located at `/users`.  The proxy uses Ribbon to locate an instance to forward to via Eureka. To skip having a service automatically added from eureka, set `zuul.ignored-services = service1`. 
-
-To augment or change the proxy routes, you can add external
-configuration like the following:
+Spring Cloud has created an embedded Zuul proxy to ease the
+development of a very common use case where a UI application wants to
+proxy calls to one or more back end services.  This feature is useful
+for a user interface to proxy to the backend services it requires,
+avoiding the need to manage CORS and authentication concerns
+independently for all the backends.
+
+To enable it, annotate a Spring Boot main class with
+`@EnableZuulProxy`, and this forwards local calls to the appropriate
+service.  By convention, a service with the Eureka ID "users", will
+receive requests from the proxy located at `/users` (with the prefix
+stripped). The proxy uses Ribbon to locate an instance to forward to
+via Eureka, and all requests are executed in a hystrix command, so
+failures will show up in Hystrix metrics, and once the circuit is open
+the proxy will not try to contact the service.
+
+To skip having a service automatically added, set
+`zuul.ignored-services` to a list of service ids. To augment or change
+the proxy routes, you can add external configuration like the
+following:
 
 .application.yml
 [source,yaml]
@@ -514,9 +530,7 @@ configuration like the following:
 ----
 
 This means that http calls to "/myusers" get forwarded to the "users"
-service. This configuration is useful for a user interface to proxy to
-the backend services it requires (avoiding the need to manage CORS and
-authentication concerns independently for all the backends).
+service (for example "/myusers/101" is forwarded to "/101").
 
 To get more fine-grained control over a route you can specify the path
 and the serviceId independently:
@@ -549,9 +563,11 @@ The location of the backend can be specified as either a "serviceId"
       url: http://example.com/users_service
 ----
 
-Forwarding to the service is protected by a Hystrix circuit breaker so if a service is down the client will see an error, but once the circuit is open the proxy will not try to contact the service.
-
-To add a prefix to all mappings, set `zuul.prefix` to a value, such as `/api`.  To strip the proxy prefix from the request before the request is forwarded set `zuul.stripPrefix = true`. You can also strip the non-wildcard prefix from individual routes, e.g.
+To add a prefix to all mappings, set `zuul.prefix` to a value, such as
+`/api`. The proxy prefix is stripped from the request before the
+request is forwarded by default (switch this behaviour off with
+`zuul.stripPrefix=false`). You can also switch off the stripping of
+the service-specific prefix from individual routes, e.g.
 
 .application.yml
 [source,yaml]
@@ -560,12 +576,18 @@ To add a prefix to all mappings, set `zuul.prefix` to a value, such as `/api`.
   routes:
     users:
       path: /myusers/**
-      stripPrefix: true
+      stripPrefix: false
 ----
 
-In this example requests to "/myusers/101" will be forwarded to "/101" on the "users" service (the path is stripped up to the first wildcard character).
+In this example requests to "/myusers/101" will be forwarded to "/myusers/101" on the "users" service.
 
-The `X-Forwarded-Host` header added to the forwarded requests by default.  To turn it off set `zuul.addProxyHeaders = false`.
+The `X-Forwarded-Host` header added to the forwarded requests by
+default.  To turn it off set `zuul.addProxyHeaders = false`.  The
+prefix path is stripped by default, and the request to the backend
+picks up a header "X-Forwarded-Prefix" ("/myusers" in the examples
+above).
 
-An application with the `@EnableZuulProxy` could act as a standalone server if you set a default route ("/"), for example `zuul.route.home: /` would route all traffic (i.e. "/**") to the "home" service.
+An application with the `@EnableZuulProxy` could act as a standalone
+server if you set a default route ("/"), for example `zuul.route.home:
+/` would route all traffic (i.e. "/**") to the "home" service.
 

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

@@ -85,9 +85,9 @@ public class ProxyRouteLocator {
 				if (route.isStripPrefix()) {
 					int index = route.getPath().indexOf("*") - 1;
 					if (index > 0) {
-						targetPath = path.substring(prefix.length() + index);
-						prefix = prefix
-								+ path.substring(prefix.length(), prefix.length() + index);
+						String routePrefix = route.getPath().substring(0, index);
+						targetPath = targetPath.replaceFirst(routePrefix, "");
+						prefix = prefix + routePrefix;
 					}
 				}
 				break;

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

@@ -21,7 +21,7 @@ import org.springframework.util.StringUtils;
 @ConfigurationProperties("zuul")
 public class ZuulProperties {
 	private String prefix = "";
-	private boolean stripPrefix = false;
+	private boolean stripPrefix = true;
 	private Map<String, ZuulRoute> routes = new LinkedHashMap<String, ZuulRoute>();
 	private boolean addProxyHeaders = true;
 	private List<String> ignoredServices = new ArrayList<String>();
@@ -43,7 +43,7 @@ public class ZuulProperties {
 		private String path;
 		private String serviceId;
 		private String url;
-		private boolean stripPrefix = false;
+		private boolean stripPrefix = true;
 
 		public ZuulRoute(String text) {
 			String location = null;

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

@@ -59,14 +59,37 @@ public class ProxyRouteLocatorTests {
 		routeLocator.getRoutes(); // force refresh
 		ProxyRouteSpec route = routeLocator.getMatchingRoute("/proxy/foo/1");
 		assertEquals("foo", route.getLocation());
+		assertEquals("/1", route.getPath());
+	}
+
+	@Test
+	public void testGetMatchingPathWithNoPrefixStripping() throws Exception {
+		ProxyRouteLocator routeLocator = new ProxyRouteLocator(this.discovery, this.properties);
+		this.properties.getRoutes().put("foo", new ZuulRoute("/foo/**", "foo", null, false));
+		this.properties.setStripPrefix(false);
+		this.properties.setPrefix("/proxy");
+		routeLocator.getRoutes(); // force refresh
+		ProxyRouteSpec route = routeLocator.getMatchingRoute("/proxy/foo/1");
+		assertEquals("foo", route.getLocation());
 		assertEquals("/proxy/foo/1", route.getPath());
 	}
 
 	@Test
-	public void testGetMatchingPathWithPrefixStripping() throws Exception {
+	public void testGetMatchingPathWithLocalPrefixStripping() throws Exception {
 		ProxyRouteLocator routeLocator = new ProxyRouteLocator(this.discovery, this.properties);
-		this.properties.getRoutes().put("foo", new ZuulRoute("/foo/**"));
-		this.properties.setStripPrefix(true);
+		this.properties.getRoutes().put("foo", new ZuulRoute("/foo/**", "foo"));
+		this.properties.setStripPrefix(false);
+		this.properties.setPrefix("/proxy");
+		routeLocator.getRoutes(); // force refresh
+		ProxyRouteSpec route = routeLocator.getMatchingRoute("/proxy/foo/1");
+		assertEquals("foo", route.getLocation());
+		assertEquals("/proxy/1", route.getPath());
+	}
+
+	@Test
+	public void testGetMatchingPathWithGlobalPrefixStripping() throws Exception {
+		ProxyRouteLocator routeLocator = new ProxyRouteLocator(this.discovery, this.properties);
+		this.properties.getRoutes().put("foo", new ZuulRoute("/foo/**", "foo", null, false));
 		this.properties.setPrefix("/proxy");
 		routeLocator.getRoutes(); // force refresh
 		ProxyRouteSpec route = routeLocator.getMatchingRoute("/proxy/foo/1");

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

@@ -21,17 +21,17 @@ public class SampleZuulProxyApplication {
         throw new RuntimeException("myerror");
     }
 
-    @RequestMapping("/local/self")
+    @RequestMapping("/local")
     public String local() {
         return "Hello local";
     }
 
-    @RequestMapping(value="/local/self/{id}", method=RequestMethod.DELETE)
+    @RequestMapping(value="/local/{id}", method=RequestMethod.DELETE)
     public String delete() {
         return "Deleted!";
     }
 
-    @RequestMapping(value="/local/self/{id}", method=RequestMethod.GET)
+    @RequestMapping(value="/local/{id}", method=RequestMethod.GET)
     public String get() {
         return "Gotten!";
     }

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

@@ -55,7 +55,7 @@ public class PreDecorationFilterTests {
 		properties.setPrefix("/api");
 		properties.setStripPrefix(true);
 		request.setRequestURI("/api/foo/1");
-		routeLocator.addRoute("/foo/**", "foo");
+		routeLocator.addRoute(new ZuulRoute("/foo/**", "foo", null, false));
 		filter.run();
 		RequestContext ctx = RequestContext.getCurrentContext();
 		assertEquals("/foo/1", ctx.get("requestURI"));
@@ -69,7 +69,7 @@ public class PreDecorationFilterTests {
 		properties.setPrefix("/api");
 		properties.setStripPrefix(true);
 		request.setRequestURI("/api/foo/1");
-		routeLocator.addRoute(new ZuulRoute("/foo/**", "foo", null, true));
+		routeLocator.addRoute("/foo/**", "foo");
 		filter.run();
 		RequestContext ctx = RequestContext.getCurrentContext();
 		assertEquals("/1", ctx.get("requestURI"));