Add some javadocs to ZuulProperties

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

@@ -44,36 +44,75 @@ import lombok.NoArgsConstructor;
 public class ZuulProperties {
 
 	/**
-	 *
+	 * Headers that are generally expected to be added by Spring Security, and hence often
+	 * duplicated if the proxy and the backend are secured with Spring. By default they
+	 * are added to the ignored headers if Spring Security is present.
 	 */
 	private static final List<String> SECURITY_HEADERS = Arrays.asList("Pragma",
 			"Cache-Control", "X-Frame-Options", "X-Content-Type-Options",
 			"X-XSS-Protection", "Expires");
 
+	/**
+	 * A common prefix for all routes.
+	 */
 	private String prefix = "";
 
+	/**
+	 * Flag saying whether to strip the prefix from the path before forwarding.
+	 */
 	private boolean stripPrefix = true;
 
+	/**
+	 * Flag for whether retry is supported by default (assuming the routes themselves
+	 * support it).
+	 */
 	private Boolean retryable;
 
+	/**
+	 * Map of route names to properties.
+	 */
 	private Map<String, ZuulRoute> routes = new LinkedHashMap<>();
 
+	/**
+	 * Flag to determine whether the proxy adds X-Forwarded-* headers.
+	 */
 	private boolean addProxyHeaders = true;
 
+	/**
+	 * Set of service names not to consider for proxying automatically. By default all
+	 * services in the discovery client will be proxied.
+	 */
 	private Set<String> ignoredServices = new LinkedHashSet<>();
 
 	private Set<String> ignoredPatterns = new LinkedHashSet<>();
 
+	/**
+	 * Names of HTTP headers to ignore completely (i.e. leave them out of downstream
+	 * requests and drop them from downstream responses).
+	 */
 	private Set<String> ignoredHeaders = new LinkedHashSet<>();
 
+	/**
+	 * Path to install Zuul as a servlet (not part of Spring MVC). The servlet is more
+	 * memory efficient for requests with large bodies, e.g. file uploads.
+	 */
 	private String servletPath = "/zuul";
 
 	private boolean ignoreLocalService = true;
 
+	/**
+	 * Host properties controlling default connection pool properties.
+	 */
 	private Host host = new Host();
 
+	/**
+	 * Flag to say that request bodies can be traced.
+	 */
 	private boolean traceRequestBody = true;
 
+	/**
+	 * Flag to say that path elelents past the first semicolon can be dropped.
+	 */
 	private boolean removeSemicolonContent = true;
 
 	public Set<String> getIgnoredHeaders() {
@@ -112,18 +151,48 @@ public class ZuulProperties {
 	@NoArgsConstructor
 	public static class ZuulRoute {
 
+		/**
+		 * The ID of the route (the same as its map key by default).
+		 */
 		private String id;
 
+		/**
+		 * The path (pattern) for the route, e.g. /foo/**.
+		 */
 		private String path;
 
+		/**
+		 * The service ID (if any) to map to this route. You can specify a physical URL or
+		 * a service, but not both.
+		 */
 		private String serviceId;
 
+		/**
+		 * A full physical URL to map to the route. An alternative is to use a service ID
+		 * and service discovery to find the physical address.
+		 */
 		private String url;
 
+		/**
+		 * Flag to determine whether the prefix for this route (the path, minus pattern
+		 * patcher) should be stripped before forwarding.
+		 */
 		private boolean stripPrefix = true;
 
+		/**
+		 * Flag to indicate that this route should be retryable (if supported). Generally
+		 * retry requires a service ID and ribbon.
+		 */
 		private Boolean retryable;
 
+		/**
+		 * List of sensitive headers that are not passed to downstream requests. Defaults
+		 * to a "safe" set of headers that commonly contain user credentials. It's OK to
+		 * remove those from the list if the downstream service is part of the same system
+		 * as the proxy, so they are sharing authentication data. If using a physical URL
+		 * outside your own domain, then generally it would be a bad idea to leak user
+		 * credentials.
+		 */
 		private Set<String> sensitiveHeaders = new LinkedHashSet<>(
 				Arrays.asList("Cookie", "Set-Cookie", "Authorization"));
 
@@ -184,7 +253,13 @@ public class ZuulProperties {
 	@AllArgsConstructor
 	@NoArgsConstructor
 	public static class Host {
+		/**
+		 * The maximum number of total connections the proxy can hold open to backends.
+		 */
 		private int maxTotalConnections = 200;
+		/**
+		 * The maximum number of connections that can be used by a single route.
+		 */
 		private int maxPerRouteConnections = 20;
 	}