diff --git a/src/dev.rs b/src/dev.rs
index f87dae74c..7e269e979 100644
--- a/src/dev.rs
+++ b/src/dev.rs
@@ -7,26 +7,9 @@
 //! # #![allow(unused_imports)]
 //! use actix_web::dev::*;
 //! ```
-pub use ws;
-pub use httpcodes;
-pub use error::ParseError;
-pub use application::{Application, ApplicationBuilder, Middleware};
-pub use httprequest::HttpRequest;
-pub use httpresponse::{Body, HttpResponse, HttpResponseBuilder};
-pub use payload::{Payload, PayloadItem, PayloadError};
-pub use resource::{Reply, Resource};
-pub use route::{Route, RouteFactory, RouteHandler};
-pub use recognizer::Params;
-pub use logger::Logger;
-pub use server::HttpServer;
-pub use context::HttpContext;
-pub use staticfiles::StaticFiles;
 
-// re-exports
-pub use http::{Method, StatusCode};
-pub use cookie::{Cookie, CookieBuilder};
-pub use cookie::{ParseError as CookieParseError};
-pub use http_range::{HttpRange, HttpRangeParseError};
+pub use super::*;
 
 // dev specific
 pub use task::Task;
+pub use recognizer::RouteRecognizer;
diff --git a/src/recognizer.rs b/src/recognizer.rs
index c3296d74a..2dcb75c38 100644
--- a/src/recognizer.rs
+++ b/src/recognizer.rs
@@ -1,4 +1,5 @@
 use std::rc::Rc;
+use std::string::ToString;
 use std::collections::HashMap;
 
 use regex::{Regex, RegexSet, Captures};
@@ -11,7 +12,19 @@ pub struct RouteRecognizer<T> {
     routes: Vec<(Pattern, T)>,
 }
 
+impl<T> Default for RouteRecognizer<T> {
+
+    fn default() -> Self {
+        RouteRecognizer {
+            prefix: 0,
+            patterns: RegexSet::new([""].iter()).unwrap(),
+            routes: Vec::new(),
+        }
+    }
+}
+
 impl<T> RouteRecognizer<T> {
+
     pub fn new(prefix: String, routes: Vec<(String, T)>) -> Self {
         let mut paths = Vec::new();
         let mut handlers = Vec::new();
@@ -29,6 +42,22 @@ impl<T> RouteRecognizer<T> {
         }
     }
 
+    pub fn set_routes(&mut self, routes: Vec<(&str, T)>) {
+        let mut paths = Vec::new();
+        let mut handlers = Vec::new();
+        for item in routes {
+            let pat = parse(item.0);
+            handlers.push((Pattern::new(&pat), item.1));
+            paths.push(pat);
+        };
+        self.patterns = RegexSet::new(&paths).unwrap();
+        self.routes = handlers;
+    }
+
+    pub fn set_prefix<P: ToString>(&mut self, prefix: P) {
+        self.prefix = prefix.to_string().len() - 1;
+    }
+
     pub fn recognize(&self, path: &str) -> Option<(Option<Params>, &T)> {
         if let Some(idx) = self.patterns.matches(&path[self.prefix..]).into_iter().next()
         {