diff --git a/Sources/Swifter/DemoServer.swift b/Sources/Swifter/DemoServer.swift
index cad48913..a67e43f9 100644
--- a/Sources/Swifter/DemoServer.swift
+++ b/Sources/Swifter/DemoServer.swift
@@ -48,7 +48,8 @@ public func demoServer(publicDir: String?) -> HttpServer {
     }
     
     server["/json"] = { request in
-        return .OK(.Json(["posts": [["id": 1, "message": "hello world"], ["id": 2, "message": "sample message"]], "new_updates": false]))
+        let jsonObject: NSDictionary = [NSString(string: "foo"): NSNumber(int: 3), NSString(string: "bar"): NSString(string: "baz")] 
+        return .OK(.Json(jsonObject))
     }
     
     server["/redirect"] = { request in
diff --git a/Sources/Swifter/HttpHandlers.swift b/Sources/Swifter/HttpHandlers.swift
index 9ff8957b..46a0c92c 100644
--- a/Sources/Swifter/HttpHandlers.swift
+++ b/Sources/Swifter/HttpHandlers.swift
@@ -10,8 +10,6 @@ public class HttpHandlers {
     
     private static let rangeExpression = try! NSRegularExpression(pattern: "bytes=(\\d*)-(\\d*)", options: .CaseInsensitive)
     
-    private static let cache = NSCache()
-    
     public class func directory(dir: String) -> (HttpRequest -> HttpResponse) {
         return { request in
             
@@ -21,16 +19,10 @@ public class HttpHandlers {
             
             let filesPath = dir + "/" + localPath.1
             
-            let cachedBody = cache.objectForKey(filesPath) as? NSData
-            
-            guard let fileBody = cachedBody ?? NSData(contentsOfFile: filesPath) else {
+            guard let fileBody = NSData(contentsOfFile: filesPath) else {
                 return HttpResponse.NotFound
             }
             
-            if cachedBody == nil {
-                cache.setObject(fileBody, forKey: filesPath)
-            }
-            
             if let rangeHeader = request.headers["range"] {
                 
                 guard let match = rangeExpression.matchesInString(rangeHeader, options: .Anchored, range: NSRange(location: 0, length: rangeHeader.characters.count)).first where match.numberOfRanges == 3 else {
diff --git a/Sources/Swifter/HttpRouter.swift b/Sources/Swifter/HttpRouter.swift
index 8558a131..635c2006 100644
--- a/Sources/Swifter/HttpRouter.swift
+++ b/Sources/Swifter/HttpRouter.swift
@@ -50,7 +50,11 @@ public class HttpRouter {
                 }
             }
             if patternToken.characters.first == ":" {
+#if os(Linux)
+                params[patternToken.substringFromIndex(1)] = valueToken
+#else
                 params[patternToken.substringFromIndex(patternToken.characters.startIndex.successor())] = valueToken
+#endif
             } else {
                 if patternToken != valueToken {
                     return nil