diff --git a/package-lock.json b/package-lock.json
index 7adff6e..9b6a5cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
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@@ -2739,54 +1152,11 @@
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@@ -2796,12 +1166,6 @@
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@@ -2893,15 +1257,6 @@
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-      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
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@@ -2918,34 +1273,22 @@
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       "dev": true
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-    "uglify-js": {
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-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
-      "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
-      "dev": true,
-      "optional": true,
+    "url": {
+      "version": "0.10.3",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
+      "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
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-        "source-map": "0.5.7",
-        "uglify-to-browserify": "1.0.2",
-        "yargs": "3.10.0"
+        "punycode": "1.3.2",
+        "querystring": "0.2.0"
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-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true,
-          "optional": true
+        "punycode": {
+          "version": "1.3.2",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
+          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0="
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-    "uglify-to-browserify": {
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@@ -2954,18 +1297,7 @@
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-      "dev": true
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-    "validate-npm-package-license": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
-      "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
-      "dev": true,
-      "requires": {
-        "spdx-correct": "1.0.2",
-        "spdx-expression-parse": "1.0.4"
-      }
+      "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g=="
     },
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@@ -2978,114 +1310,27 @@
         "extsprintf": "1.3.0"
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-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
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-      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
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-      "integrity": "sha1-+Aek8LHZ6ROuekgRLmzDrxmRtF8=",
-      "dev": true,
+    "xml2js": {
+      "version": "0.4.17",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.17.tgz",
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-        "imurmurhash": "0.1.4",
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+        "sax": "1.2.1",
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-      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
-      "dev": true,
+    "xmlbuilder": {
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+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-4.2.1.tgz",
+      "integrity": "sha1-qlijBBoGb5DqoWwvU4n/GfP0YaU=",
       "requires": {
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-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
-          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
-          "dev": true
-        }
+        "lodash": "4.17.4"
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   }
diff --git a/package.json b/package.json
index a4e62ec..05d4d16 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lambda-framework",
-  "version": "1.0.0",
+  "version": "1.0.16",
   "description": "Framework to create web apps in AWS Lambda",
   "main": "dist/src/index.js",
   "types": "dist/src/index.d.ts",
@@ -32,9 +32,7 @@
     "@types/node": "^8.0.28",
     "chai": "^4.1.2",
     "coveralls": "^3.0.0",
-    "istanbul": "^0.4.5",
     "mocha": "^3.5.3",
-    "nyc": "^11.2.1",
     "tslint": "^5.7.0",
     "tslint-microsoft-contrib": "^5.0.1",
     "typescript": "^2.5.2"
@@ -43,6 +41,7 @@
     "@types/aws-lambda": "0.0.16",
     "@types/sinon": "^2.3.7",
     "accepts": "^1.3.4",
+    "aws-sdk": "^2.141.0",
     "bytes": "^3.0.0",
     "content-type": "^1.0.4",
     "cookie": "^0.3.1",
@@ -52,6 +51,7 @@
     "fresh": "^0.5.2",
     "logger": "0.0.1",
     "mime-types": "^2.1.17",
+    "node-cache": "^4.1.1",
     "npm-auto-version": "^1.0.0",
     "path-to-regexp": "^2.0.0",
     "qs": "^6.5.1",
diff --git a/src/index.ts b/src/index.ts
index 4ffe61d..2f3f079 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -31,3 +31,9 @@ export { default as IBodyParser } from "./lib/types/http/IBodyParser";
 export { default as JsonParser } from "./lib/http/bodyParsers/JsonParser";
 export { default as MultipartParser } from "./lib/http/bodyParsers/MultipartParser";
 export { default as UrlEncodedParser } from "./lib/http/bodyParsers/UrlEncodedParser";
+
+export { default as ITemplate } from "./lib/types/http/renderEngine/ITemplate";
+export { default as ITemplateEngine } from "./lib/types/http/renderEngine/ITemplateEngine";
+export { default as ITemplateLoader } from "./lib/types/http/renderEngine/ITemplateLoader";
+export { default as ITemplateRenderer } from "./lib/types/http/renderEngine/ITemplateRenderer";
+export { default as DefaultTemplateLoader } from "./lib/http/renderEngine/DefaultTemplateLoader";
diff --git a/src/lib/App.ts b/src/lib/App.ts
index 6473466..9221b36 100644
--- a/src/lib/App.ts
+++ b/src/lib/App.ts
@@ -7,6 +7,8 @@ import HttpError from "./exceptions/HttpError";
 import httpFinalHandler from "./http/httpFinalHandler";
 import HttpRequest from "./http/HttpRequest";
 import HttpResponse from "./http/HttpResponse";
+import DefaultTemplateLoader from "./http/renderEngine/DefaultTemplateLoader";
+import TemplateEngine from "./http/renderEngine/TemplateEngine";
 import Router from "./Router";
 import IEventHandler from "./types/event/IEventHandler";
 import IEventRequest from "./types/event/IEventRequest";
@@ -16,6 +18,9 @@ import IHttpPlaceholderHandler from "./types/http/IHttpPlaceholderHandler";
 import IHttpRequest from "./types/http/IHttpRequest";
 import IHttpResponse from "./types/http/IHttpResponse";
 import IHttpRoute from "./types/http/IHttpRoute";
+import ITemplateEngine from "./types/http/renderEngine/ITemplateEngine";
+import ITemplateLoader from "./types/http/renderEngine/ITemplateLoader";
+import ITemplateRenderer from "./types/http/renderEngine/ITemplateRenderer";
 import IApp from "./types/IApp";
 import IRouter from "./types/IRouter";
 import { getEventType } from "./utils/utils";
@@ -26,14 +31,18 @@ import { getEventType } from "./utils/utils";
 export default class App implements IApp {
 
   private _settings: object;
-
   private _router: IRouter;
+  private _templateEngine: ITemplateEngine;
 
   constructor() {
     this._settings = {};
     this._router = new Router();
   }
 
+  get templateEngine(): ITemplateEngine {
+    return this._templateEngine;
+  }
+
   public init(settings?: object): void {
     this.initDefaultConfiguration(settings);
   }
@@ -102,6 +111,13 @@ export default class App implements IApp {
     return this;
   }
 
+  public addTemplateEngine(bucket: string, renderer: ITemplateRenderer, ttl?: number): IApp {
+    const templateLoader: ITemplateLoader = new DefaultTemplateLoader(bucket, ttl);
+    this._templateEngine = new TemplateEngine(bucket, renderer, templateLoader);
+
+    return this;
+  }
+
   private initDefaultConfiguration(settings: object): void {
     this._settings = settings ? settings : defaultConfiguration;
   }
diff --git a/src/lib/configuration/configuration.ts b/src/lib/configuration/configuration.ts
index 52b0dee..4bd4274 100644
--- a/src/lib/configuration/configuration.ts
+++ b/src/lib/configuration/configuration.ts
@@ -10,9 +10,7 @@ const configuration = {
   COOKIE_SECRET: "cookie_secret",
   JSON_REPLACER: "json_replacer",
   JSON_SPACES: "json_spaces",
-  JSON_ESCAPE: "json_escape",
-  TEMPLATE_RENDERER_FILES_BUCKET: "template_renderer_files_bucket",
-  TEMPLATE_RENDERER_FUNCTION: "template_renderer_function"
+  JSON_ESCAPE: "json_escape"
 };
 
 export default configuration;
diff --git a/src/lib/http/HttpResponse.ts b/src/lib/http/HttpResponse.ts
index f6f3b9c..6fc1464 100644
--- a/src/lib/http/HttpResponse.ts
+++ b/src/lib/http/HttpResponse.ts
@@ -10,10 +10,10 @@ import IHttpError from "./../types/exceptions/IHttpError";
 import IHttpHandler from "./../types/http/IHttpHandler";
 import IHttpRequest from "./../types/http/IHttpRequest";
 import IHttpResponse from "./../types/http/IHttpResponse";
+import ITemplateEngine from "./../types/http/renderEngine/ITemplateEngine";
 import IApp from "./../types/IApp";
 import INext from "./../types/INext";
 import { merge, normalizeType, setCharset, stringify } from "./../utils/utils";
-import AbstractTemplateEngine from "./renderEngine/AbstractRenderEngine";
 
 /**
  * This class represents an HTTP response, with the helpers to be sent.
@@ -351,17 +351,24 @@ export default class HttpResponse implements IHttpResponse {
     }
   }
 
-  public render(view: string, params: {[name: string]: any}, callback?: (html: string) => void): void {
-    const templateEngine: AbstractTemplateEngine = new AbstractTemplateEngine(this._app);
-
-    templateEngine.render(view, params, (html) => {
-      if(callback) {
-        callback(html);
-      } else {
-        this.putHeader("Content-Type", "text/html");
-        this.send(html);
-      }
-    });
+  public render(view: string, params: {[name: string]: any}, callback?: (err: Error, html: string) => void): void {
+    const templateEngine: ITemplateEngine = this._app.templateEngine;
+    if (templateEngine == null) {
+      throw new Error("The template engine must to be added in `app.addTemplateEngine` if you want to use render.");
+    } else {
+      templateEngine.render(view, params, (err: Error, html: string) => {
+        if (callback) {
+          callback(err, html);
+        } else {
+          if (err) {
+            this._request.next(err);
+          } else {
+            this.putHeader("Content-Type", "text/html");
+            this.send(html);
+          }
+        }
+      });
+    }
   }
 
   public setError(error: IHttpError): IHttpResponse {
diff --git a/src/lib/http/renderEngine/AbstractRenderEngine.ts b/src/lib/http/renderEngine/AbstractRenderEngine.ts
deleted file mode 100644
index 1bb1b16..0000000
--- a/src/lib/http/renderEngine/AbstractRenderEngine.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-import configuration from "./../../configuration/configuration";
-import ITemplateRenderer from "./../../types/http/renderEngine/ITemplateRenderer";
-import ITemplate from "./../../types/http/renderEngine/ITemplate";
-import IApp from "./../../types/IApp";
-import Template from "./Template";
-
-const checkIsTemplateRenderer = (func: any) => {
-  return typeof func == "function" && (func.arguments == 2 || func.arguments == 3);
-}
-
-export default class AbstractTemplateEngine {
-
-  private _bucket: string;
-  private _templateRenderer: ITemplateRenderer;
-
-  constructor(app: IApp) {
-    this._bucket = app.get(configuration.TEMPLATE_RENDERER_FILES_BUCKET);
-    this._templateRenderer = app.get(configuration.TEMPLATE_RENDERER_FUNCTION);
-
-    if(!this._bucket) {
-      throw new Error("The bucket of the files that are going to be rendered is required.");
-    }
-
-    if(!this._templateRenderer || !checkIsTemplateRenderer(this._templateRenderer)) {
-      throw new Error("The template renderer is required and have to be a function which implements ITemplateRenderer.");
-    }
-  }
-
-  public render(fileName: string, params: {[name: string]: any}, callback: (parsedHtml: string) => void): void {
-    const template: ITemplate = new Template(fileName, this._bucket);
-
-    template.load(() => {
-      this._templateRenderer(template, params, (parsedHtml: string) => {
-        callback(parsedHtml);
-      });
-    });
-  }
-
-}
diff --git a/src/lib/http/renderEngine/DefaultTemplateLoader.ts b/src/lib/http/renderEngine/DefaultTemplateLoader.ts
new file mode 100644
index 0000000..ede7890
--- /dev/null
+++ b/src/lib/http/renderEngine/DefaultTemplateLoader.ts
@@ -0,0 +1,68 @@
+import * as S3 from "aws-sdk/clients/s3";
+import * as NodeCache from "node-cache";
+import ITemplateLoader from "./../../types/http/renderEngine/ITemplateLoader";
+
+/**
+ * Loads the template from AWS S3 bucket.
+ */
+export default class DefaultTemplateLoader implements ITemplateLoader {
+
+  private _s3: S3;
+  private _bucket: string;
+  private _cache: NodeCache;
+
+  constructor(bucket: string, ttl: number) {
+    this._s3 = new S3();
+    this._bucket = bucket;
+    if (ttl) {
+        this._cache = new NodeCache({ stdTTL: ttl });
+    }
+  }
+
+  public load(fileName: string, callback: (err: Error, content: string) => void): void {
+    this.getFromCache(fileName, (cacheErr: Error, cacheValue: string) => {
+      if (cacheErr) {
+        callback(cacheErr, null);
+      } else {
+        if (cacheValue === undefined) {
+          this._s3.getObject(
+            {
+              Bucket: this._bucket,
+              Key: fileName
+            },
+            (err: Error, data: S3.Types.GetObjectOutput) => {
+              if (err) {
+                callback(err, null);
+              } else {
+                const content: string = data.Body.toString();
+                this.setToCache(fileName, content);
+                callback(null, content);
+              }
+            }
+          );
+        } else {
+          callback(null, cacheValue);
+        }
+      }
+    });
+  }
+
+  private getFromCache(fileName: string, callback: (cacheErr: Error, cacheValue: string) => void): void {
+    if (this._cache) {
+      this._cache.get(fileName, callback);
+    } else {
+      callback(null, undefined);
+    }
+  }
+
+  private setToCache(fileName: string, content: string): void {
+    if (this._cache) {
+      this._cache.set(fileName, (err: Error, success: boolean) => {
+        if (err || !success) {
+          console.error("Error saving template into cache: " + fileName, err);
+        }
+      });
+    }
+  }
+
+}
diff --git a/src/lib/http/renderEngine/Template.ts b/src/lib/http/renderEngine/Template.ts
index 68b5d12..6374454 100644
--- a/src/lib/http/renderEngine/Template.ts
+++ b/src/lib/http/renderEngine/Template.ts
@@ -1,36 +1,45 @@
 import ITemplate from "./../../types/http/renderEngine/ITemplate";
+import ITemplateLoader from "./../../types/http/renderEngine/ITemplateLoader";
 
-const cachedTemplates: {[name: string]: string} = {};
-
+/**
+ * Representation of a template file.
+ */
 export default class Template implements ITemplate {
 
   private _fileName: string;
-  private _bucket: string;
   private _content: string;
   private _loaded: boolean;
+  private _templateLoader: ITemplateLoader;
 
-  constructor(fileName: string, bucket: string) {
+  constructor(fileName: string, templateLoader: ITemplateLoader) {
     this._fileName = fileName;
-    this._bucket = bucket;
     this._loaded = false;
+    this._templateLoader = templateLoader;
   }
 
   get content(): string {
-    if(!this._loaded) {
+    if (!this._loaded) {
       throw new Error("The template " + this._fileName + " has not been loaded.");
     }
     return this._content;
   }
 
-  public load(callback: () => void): void {
-    if(!this._loaded) {
-      if(cachedTemplates[this._fileName]) {
-        this._content = cachedTemplates[this._fileName];
-      } else {
-        // TODO load file from S3
-        cachedTemplates[this._fileName] = this._content;
-        this._loaded = true;
-      }
+  public load(callback: (err?: Error) => void): void {
+    if (!this._loaded) {
+      this._templateLoader.load(
+        this._fileName,
+        (err: Error, content: string) => {
+          if (err) {
+            callback(err);
+          } else {
+            this._content = content;
+            this._loaded = true;
+            callback();
+          }
+        }
+      );
+    } else {
+      callback();
     }
   }
 
diff --git a/src/lib/http/renderEngine/TemplateEngine.ts b/src/lib/http/renderEngine/TemplateEngine.ts
new file mode 100644
index 0000000..a313c26
--- /dev/null
+++ b/src/lib/http/renderEngine/TemplateEngine.ts
@@ -0,0 +1,34 @@
+import ITemplate from "./../../types/http/renderEngine/ITemplate";
+import ITemplateEngine from "./../../types/http/renderEngine/ITemplateEngine";
+import ITemplateLoader from "./../../types/http/renderEngine/ITemplateLoader";
+import ITemplateRenderer from "./../../types/http/renderEngine/ITemplateRenderer";
+import Template from "./Template";
+
+/**
+ * A class that render a template with a template renderer.
+ */
+export default class TemplateEngine implements ITemplateEngine {
+
+  private _bucket: string;
+  private _templateRenderer: ITemplateRenderer;
+  private _templateLoader: ITemplateLoader;
+
+  constructor(bucket: string, templateRenderer: ITemplateRenderer, templateLoader: ITemplateLoader) {
+    this._bucket = bucket;
+    this._templateRenderer = templateRenderer;
+    this._templateLoader = templateLoader;
+  }
+
+  public render(fileName: string, params: {[name: string]: any}, callback: (err: Error, parsedHtml: string) => void): void {
+    const template: ITemplate = new Template(fileName, this._templateLoader);
+
+    template.load((err: Error) => {
+      if (err) {
+        callback(err, null);
+      } else {
+        this._templateRenderer(template, params, callback);
+      }
+    });
+  }
+
+}
diff --git a/src/lib/types/IApp.ts b/src/lib/types/IApp.ts
index e6c111b..a410765 100644
--- a/src/lib/types/IApp.ts
+++ b/src/lib/types/IApp.ts
@@ -4,6 +4,8 @@ import IEventRoutePredicate from "./event/IEventRoutePredicate";
 import IHttpHandler from "./http/IHttpHandler";
 import IHttpPlaceholderHandler from "./http/IHttpPlaceholderHandler";
 import IHttpRoute from "./http/IHttpRoute";
+import ITemplateEngine from "./http/renderEngine/ITemplateEngine";
+import ITemplateRenderer from "./http/renderEngine/ITemplateRenderer";
 import IRouter from "./IRouter";
 
 /**
@@ -13,111 +15,131 @@ import IRouter from "./IRouter";
  */
 export default interface IApp {
 
-    /**
-     * Initialize the framework with the configuration of `settings`. If
-     * no `settings`are given, the framework is initialized with the
-     * default configuration.
-     *
-     * @param {object} settings
-     */
-    init(settings?: object): void;
+  /**
+   * Returns the created templated engine with the method `addTemplateEngine`.
+   */
+  readonly templateEngine: ITemplateEngine;
 
-    /**
-     * Set to _true_ the configuration param `key`.
-     *
-     * @param {string} key
-     */
-    enable(key: string): void;
+  /**
+   * Initialize the framework with the configuration of `settings`. If
+   * no `settings`are given, the framework is initialized with the
+   * default configuration.
+   *
+   * @param {object} settings
+   */
+  init(settings?: object): void;
 
-    /**
-     * Set to _false_ the configuration param `key`.
-     * @param {string} key
-     */
-    disable(key: string): void;
+  /**
+   * Set to _true_ the configuration param `key`.
+   *
+   * @param {string} key
+   */
+  enable(key: string): void;
 
-    /**
-     * Set to `value` the configuration param `key`.
-     *
-     * @param {string} key
-     * @param {any}    value
-     */
-    set(key: string, value: any): void;
+  /**
+   * Set to _false_ the configuration param `key`.
+   * @param {string} key
+   */
+  disable(key: string): void;
 
-    /**
-     * Return the value of the configuration param `key`.
-     *
-     * @param  {string} key
-     * @return {any}
-     */
-    get(key: string): any;
+  /**
+   * Set to `value` the configuration param `key`.
+   *
+   * @param {string} key
+   * @param {any}    value
+   */
+  set(key: string, value: any): void;
 
-    /**
-     * Handle an incoming lambda funciton.
-     *
-     * @param {any}      event
-     * @param {Context}  context
-     * @param {Callback} callback
-     */
-    handle(event: any, context: Context, callback?: Callback): void;
+  /**
+   * Return the value of the configuration param `key`.
+   *
+   * @param  {string} key
+   * @return {any}
+   */
+  get(key: string): any;
 
-    /**
-     * Use the given handler, with optional path, defaulting to "/".
-     *
-     * Use (like `.all`) will run for any http METHOD, but it will not add
-     * handlers for those methods so OPTIONS requests will not consider `.httpUse`
-     * functions even if they could respond.
-     *
-     * @param  {string}              path
-     * @param  {IHttpHandler[]} handlers
-     * @return {IRouter}
-     */
-    use(handler: IHttpHandler|IHttpHandler[], path?: string): IApp;
+  /**
+   * Handle an incoming lambda funciton.
+   *
+   * @param {any}      event
+   * @param {Context}  context
+   * @param {Callback} callback
+   */
+  handle(event: any, context: Context, callback?: Callback): void;
 
-    /**
-     * Mount router in the given path. If no path is given, the default path
-     * will be /. The path is applied only for HTTP routing.
-     *
-     * @param  {IRouter} router
-     * @param  {string}  path
-     * @return {IApp}
-     */
-    mount(router: IRouter, path?: string): IApp;
+  /**
+   * Use the given handler, with optional path, defaulting to "/".
+   *
+   * Use (like `.all`) will run for any http METHOD, but it will not add
+   * handlers for those methods so OPTIONS requests will not consider `.httpUse`
+   * functions even if they could respond.
+   *
+   * @param  {string}              path
+   * @param  {IHttpHandler[]} handlers
+   * @return {IRouter}
+   */
+  use(handler: IHttpHandler|IHttpHandler[], path?: string): IApp;
 
-    /**
-     * Map the given param placeholder `name`(s) to the given callback.
-     *
-     * Parameter mapping is used to provide pre-conditions to HTTP routes
-     * which use normalized placeholders. For example a _:user_id_ parameter
-     * could automatically load a user's information from the database without
-     * any additional code.
-     *
-     * The callback uses the same signature as middleware, the only difference
-     * being that the value of the placeholder is passed, in this case the _id_
-     * of the user. Once the `next()` function is invoked, just like middleware
-     * it will continue on to execute the route, or subsequent parameter functions.
-     *
-     * @param  {string}       name
-     * @param  {IHttpHandler} handler
-     */
-    param(name: string, handler: IHttpPlaceholderHandler): IApp;
+  /**
+   * Mount router in the given path. If no path is given, the default path
+   * will be /. The path is applied only for HTTP routing.
+   *
+   * @param  {IRouter} router
+   * @param  {string}  path
+   * @return {IApp}
+   */
+  mount(router: IRouter, path?: string): IApp;
 
-    /**
-     * Create a new HTTP route for the given path.
-     *
-     * @param  {string}     path
-     * @param  {string}     method
-     * @return {IHttpRoute}
-     */
-    route(path: string): IHttpRoute;
+  /**
+   * Map the given param placeholder `name`(s) to the given callback.
+   *
+   * Parameter mapping is used to provide pre-conditions to HTTP routes
+   * which use normalized placeholders. For example a _:user_id_ parameter
+   * could automatically load a user's information from the database without
+   * any additional code.
+   *
+   * The callback uses the same signature as middleware, the only difference
+   * being that the value of the placeholder is passed, in this case the _id_
+   * of the user. Once the `next()` function is invoked, just like middleware
+   * it will continue on to execute the route, or subsequent parameter functions.
+   *
+   * @param  {string}       name
+   * @param  {IHttpHandler} handler
+   */
+  param(name: string, handler: IHttpPlaceholderHandler): IApp;
 
-    /**
-     * Use the given handler for the given event or for the event requests
-     * which matches with the given predicate.
-     *
-     * @param  {string|IEventRoutePredicate} event
-     * @param {IEventHandler} handler
-     * @return {IEventRoute}
-     */
-    event(event: string|IEventRoutePredicate, handler: IEventHandler): IApp;
+  /**
+   * Create a new HTTP route for the given path.
+   *
+   * @param  {string}     path
+   * @param  {string}     method
+   * @return {IHttpRoute}
+   */
+  route(path: string): IHttpRoute;
+
+  /**
+   * Use the given handler for the given event or for the event requests
+   * which matches with the given predicate.
+   *
+   * @param  {string|IEventRoutePredicate} event
+   * @param {IEventHandler} handler
+   * @return {IEventRoute}
+   */
+  event(event: string|IEventRoutePredicate, handler: IEventHandler): IApp;
+
+  /**
+   * Add a render engine to be used in `IHttpResponse.request`.
+   *
+   * @param  {string}            bucket   The S3 bucket where the template
+   *                                      files are.
+   * @param  {ITemplateRenderer} renderer The function to render the template
+   *                                      file with the params.
+   * @param  {number}            ttl      The time to caching the template
+   *                                      in case that the lambda function
+   *                                      still alive. In debug mode, the
+   *                                      templates are not cached.
+   * @return {IApp}
+   */
+  addTemplateEngine(bucket: string, renderer: ITemplateRenderer, ttl?: number): IApp;
 
 }
diff --git a/src/lib/types/http/IHttpResponse.ts b/src/lib/types/http/IHttpResponse.ts
index 3d42f84..01bc7e8 100644
--- a/src/lib/types/http/IHttpResponse.ts
+++ b/src/lib/types/http/IHttpResponse.ts
@@ -204,7 +204,7 @@ export default interface IHttpResponse {
    * @param {Function} callback A function that will be called when the
    *                            rendering is finished.
    */
-  render(view: string, options?: object, callback?: () => void): void;
+  render(view: string, options?: object, callback?: (err: Error, html: string) => void): void;
 
   /**
    * When a exception happens, the error is set with the exception
diff --git a/src/lib/types/http/renderEngine/ITemplate.ts b/src/lib/types/http/renderEngine/ITemplate.ts
index 2e11c6b..caca2ec 100644
--- a/src/lib/types/http/renderEngine/ITemplate.ts
+++ b/src/lib/types/http/renderEngine/ITemplate.ts
@@ -1,10 +1,10 @@
-/*
-Representation of a template file.
+/**
+ * Representation of a template file.
  */
  export default interface ITemplate {
 
    readonly content: string;
 
-   load(callback: () => void): void;
+   load(callback: (err: Error) => void): void;
 
  }
diff --git a/src/lib/types/http/renderEngine/ITemplateEngine.ts b/src/lib/types/http/renderEngine/ITemplateEngine.ts
new file mode 100644
index 0000000..bddc95b
--- /dev/null
+++ b/src/lib/types/http/renderEngine/ITemplateEngine.ts
@@ -0,0 +1,8 @@
+/**
+ * A class that render a template with a template renderer.
+ */
+ export default interface ITemplateEngine {
+
+   render(fileName: string, params: {[name: string]: any}, callback: (err: Error, parsedHtml: string) => void): void;
+
+ }
diff --git a/src/lib/types/http/renderEngine/ITemplateLoader.ts b/src/lib/types/http/renderEngine/ITemplateLoader.ts
new file mode 100644
index 0000000..369ab03
--- /dev/null
+++ b/src/lib/types/http/renderEngine/ITemplateLoader.ts
@@ -0,0 +1,6 @@
+/**
+ * Implements the object that retrieve the content of a template file.
+ */
+export default interface ITemplateLoader {
+  load(fileName: string, callback: (err: Error, content: string) => void): void;
+}
diff --git a/src/lib/types/http/renderEngine/ITemplateRenderer.ts b/src/lib/types/http/renderEngine/ITemplateRenderer.ts
index fa16734..2bf72ee 100644
--- a/src/lib/types/http/renderEngine/ITemplateRenderer.ts
+++ b/src/lib/types/http/renderEngine/ITemplateRenderer.ts
@@ -3,5 +3,5 @@ import ITemplate from "./ITemplate";
 /**
  * The interface that has to implement the function that render a template.
  */
- type ITemplateRenderer = (template: ITemplate, params: {[name: string]: any}, callback: (parsedHtml: string) => void) => void;
- export default ITemplateRenderer;
+type ITemplateRenderer = (template: ITemplate, params: {[name: string]: any}, callback: (err: Error, parsedHtml: string) => void) => void;
+export default ITemplateRenderer;
diff --git a/test/http/HttpResponse.spec.ts b/test/http/HttpResponse.spec.ts
index 6d24b2e..6564b1d 100644
--- a/test/http/HttpResponse.spec.ts
+++ b/test/http/HttpResponse.spec.ts
@@ -334,4 +334,26 @@ describe('HttpResponse', () => {
     Chai.expect(succResult.statusCode).to.be.equal(301)
   });
 
+  describe("render", () => {
+    it("should throw an exception if the `templateEngine` hasn't been set in the `App`.", () => {
+
+    });
+
+    it("should call the method `render` of `templateEngine` if it has been set in the `App`.", () => {
+
+    });
+
+    it("should call the `callback` with the result of `templateEngine.render`.", () => {
+
+    });
+
+    it("should call the `next` handler with the error if the `templateEngine.render` method returns an error and no `callback` is given.", () => {
+
+    });
+
+    it("should response with the html code and the 'text/html' content-type header if the `templateEngine.render` method returns no error and no `callback` is given.", () => {
+
+    });
+  });
+
 });
diff --git a/test/http/renderEngine/DefaultTemplateLoader.spec.ts b/test/http/renderEngine/DefaultTemplateLoader.spec.ts
new file mode 100644
index 0000000..c807336
--- /dev/null
+++ b/test/http/renderEngine/DefaultTemplateLoader.spec.ts
@@ -0,0 +1,90 @@
+import * as S3 from "aws-sdk/clients/s3";
+import * as Chai from "chai";
+import * as NodeCache from "node-cache";
+import { stub, SinonStub } from "sinon";
+import DefaultTemplateLoader from "./../../../src/lib/http/renderEngine/DefaultTemplateLoader";
+import ITemplateLoader from "./../../../src/lib/types/http/renderEngine/ITemplateLoader";
+
+/**
+ * Test for DefaultTemplateLoader.
+ */
+describe("DefaultTemplateLoader", () => {
+  const getCacheStub = stub(NodeCache.prototype, "get");
+  const getObjectStub = stub(S3.prototype, "makeRequest").withArgs("getObject");
+  const loader: ITemplateLoader = new DefaultTemplateLoader("bucket", 30000);
+
+  afterEach(() => {
+    getObjectStub.reset();
+    getCacheStub.reset();
+  });
+
+  describe("load", () => {
+    it("should load from cache the template if has been previously loaded and run the callback with the cached content.", (done) => {
+      getCacheStub.callsFake((key: string, callback) => {
+        callback(null, "Cached content");
+      });
+      loader.load("prueba.pug", (err: Error, content: string) => {
+        Chai.expect(getCacheStub.calledOnce).to.be.true;
+        Chai.expect(getObjectStub.calledOnce).to.be.false;
+        done();
+      });
+    });
+
+    it("should call the `callback` with an error if an error happens getting the template from the cache.", (done) => {
+      const returnedError: Error = new Error("Test error.");
+      getCacheStub.callsFake((key: string, callback) => {
+        callback(returnedError, null);
+      });
+      loader.load("prueba.pug", (err: Error, content: string) => {
+        Chai.expect(err).to.be.equal(returnedError);
+        done();
+      });
+    });
+
+    it("should load from S3 if the cache is not defined and run the callback with the content.", (done) => {
+      const loader: ITemplateLoader = new DefaultTemplateLoader("bucket", null);
+      getObjectStub.callsFake((operation: string, params?: {[key: string]: any}, callback?: (err: Error, data: any) => void) => {
+        callback(null, {
+          Body: "Test content."
+        });
+      });
+      loader.load("prueba.pug", (err: Error, content: string) => {
+        Chai.expect(getObjectStub.called).to.be.true;
+        Chai.expect(content).to.be.equal("Test content.");
+        done();
+      });
+    });
+
+    it("should load from S3 if the template has not been previously loaded.", (done) => {
+      getObjectStub.callsFake((operation: string, params?: {[key: string]: any}, callback?: (err: Error, data: any) => void) => {
+        callback(null, {
+          Body: "Test content."
+        });
+      });
+      getCacheStub.callsFake((key: string, callback) => {
+        callback(null, undefined);
+      });
+      loader.load("prueba.pug", (err: Error, content: string) => {
+        Chai.expect(getCacheStub.called).to.be.true;
+        Chai.expect(getObjectStub.called).to.be.true;
+        Chai.expect(content).to.be.equal("Test content.");
+        done();
+      });
+    });
+
+    it("should call the `callback` with an error if an error happens getting the template from S3.", (done) => {
+      const returnedError: Error = new Error("Test error.");
+      getObjectStub.callsFake((operation: string, params?: {[key: string]: any}, callback?: (err: Error, data: any) => void) => {
+        callback(returnedError, null);
+      });
+      getCacheStub.callsFake((key: string, callback) => {
+        callback(null, undefined);
+      });
+      loader.load("prueba.pug", (err: Error, content: string) => {
+        Chai.expect(err).to.be.equal(returnedError);
+        done();
+      });
+    });
+  });
+
+});
diff --git a/test/http/renderEngine/Template.spec.ts b/test/http/renderEngine/Template.spec.ts
new file mode 100644
index 0000000..efd96eb
--- /dev/null
+++ b/test/http/renderEngine/Template.spec.ts
@@ -0,0 +1,65 @@
+import * as Chai from "chai";
+import { stub, SinonStub } from "sinon";
+import DefaultTemplateLoader from "./../../../src/lib/http/renderEngine/DefaultTemplateLoader";
+import Template from "./../../../src/lib/http/renderEngine/Template";
+import ITemplate from "./../../../src/lib/types/http/renderEngine/ITemplate";
+import ITemplateLoader from "./../../../src/lib/types/http/renderEngine/ITemplateLoader";
+
+/**
+ * Test for Template.
+ */
+describe("Template", () => {
+  const templateLoader: ITemplateLoader = new DefaultTemplateLoader(null, null);
+  const templateLoaderFunc: SinonStub = templateLoader.load = stub();
+  let template: ITemplate;
+
+  beforeEach(() => {
+    template = new Template("test.pug", templateLoader);
+    templateLoaderFunc.callsFake((fileName: string, callback: (Error, string) => void) => callback(null, "Test content."));
+  });
+
+  afterEach(() => {
+    templateLoaderFunc.reset();
+  });
+
+  describe("content", () => {
+    it("should throw an exception if the template is not previously loaded.", () => {
+      Chai.expect(() => template.content).to.throw("The template test.pug has not been loaded.");
+    });
+
+    it("should return the content of the template if has been previously loaded.", (done) => {
+      template.load(() => {
+        Chai.expect(() => template.content).to.not.throw("The template test.pug has not been loaded.");
+        done();
+      });
+    });
+  });
+
+  describe("load", () => {
+    it("should load the template calling the template loader if it has NOT been previously loaded.", (done) => {
+      template.load(() => {
+        Chai.expect(templateLoaderFunc.called).to.be.true;
+        done();
+      });
+    });
+
+    it("should NOT call the template loader if it has been previously loaded.", (done) => {
+      template.load(() => {
+        template.load(() => {
+          Chai.expect(templateLoaderFunc.calledOnce).to.be.true;
+          done();
+        });
+      });
+    });
+
+    it("should NOT call callback with an error if there was an error loading the template.", (done) => {
+      const expectedError: Error = new Error("Test.");
+      templateLoaderFunc.callsFake((fileName: string, callback: (Error, string) => void) => callback(expectedError, null));
+      template.load((err: Error) => {
+        Chai.expect(err).to.be.equal(expectedError);
+        done();
+      });
+    });
+  });
+
+});
diff --git a/test/http/renderEngine/TemplateEngine.spec.ts b/test/http/renderEngine/TemplateEngine.spec.ts
new file mode 100644
index 0000000..6d42b9e
--- /dev/null
+++ b/test/http/renderEngine/TemplateEngine.spec.ts
@@ -0,0 +1,77 @@
+import * as Chai from "chai";
+import { SinonStub, stub } from "sinon";
+import DefaultTemplateLoader from "./../../../src/lib/http/renderEngine/DefaultTemplateLoader";
+import TemplateEngine from "./../../../src/lib/http/renderEngine/TemplateEngine";
+import ITemplate from "./../../../src/lib/types/http/renderEngine/ITemplate";
+import ITemplateEngine from "./../../../src/lib/types/http/renderEngine/ITemplateEngine";
+import ITemplateLoader from "./../../../src/lib/types/http/renderEngine/ITemplateLoader";
+import ITemplateRenderer from "./../../../src/lib/types/http/renderEngine/ITemplateRenderer";
+
+/**
+ * Test for TemplateEngine.
+ */
+describe("TemplateEngine", () => {
+  const templateRenderer: SinonStub = stub();
+  const templateLoader: ITemplateLoader = new DefaultTemplateLoader(null, null);
+  const templateLoaderFunc: SinonStub = templateLoader.load = stub();
+  const templateEngine: ITemplateEngine = new TemplateEngine("bucketName", <ITemplateRenderer> <any> templateRenderer, <ITemplateLoader> <any> templateLoader);
+
+  afterEach(() => {
+    templateLoaderFunc.reset();
+    templateRenderer.reset();
+  });
+
+  describe("render", () => {
+    it("should call the `callback` function with an error if there is an error loading the template.", (done) => {
+      const returnedError: Error = new Error("Forced error");
+
+      templateLoaderFunc.callsFake((fileName: string, callback: (err: Error, content: string) => void) => {
+        callback(returnedError, null);
+      });
+
+      templateEngine.render("fileName", {}, (err: Error, parsedHtml: string) => {
+        Chai.expect(err).to.be.equal(returnedError);
+        Chai.expect(parsedHtml).to.be.null;
+        done();
+      });
+    });
+
+    it("should call the `callback` function with an error if there is an error rendering the template.", (done) => {
+      const returnedError: Error = new Error("Forced error");
+
+      templateRenderer.callsFake((template: ITemplate, params: {[name: string]: any}, callback: (err: Error, parsedHtml: string) => void) => {
+        callback(returnedError, null);
+      });
+
+      templateLoaderFunc.callsFake((fileName: string, callback: (err: Error, content: string) => void) => {
+        callback(null, "PRUEBA");
+      });
+
+      templateEngine.render("fileName", {}, (err: Error, parsedHtml: string) => {
+        Chai.expect(err).to.be.equal(returnedError);
+        Chai.expect(parsedHtml).to.be.null;
+        done();
+      });
+    });
+
+    it("should call the `templateRenderer` function with the `template`, the `params` and the `callback` if the template has been successfully loaded.", (done) => {
+      const expectedContent = "PRUEBA";
+      const expectedParams = {param1: "value1"};
+
+      templateRenderer.callsFake((template: ITemplate, params: {[name: string]: any}, callback: (err: Error, parsedHtml: string) => void) => {
+        Chai.expect(template.content).to.be.equal(expectedContent);
+        Chai.expect(params).to.be.equal(expectedParams);
+        callback(null, template.content);
+      });
+
+      templateLoaderFunc.callsFake((fileName: string, callback: (err: Error, content: string) => void) => {
+        callback(null, expectedContent);
+      });
+
+      templateEngine.render("fileName", expectedParams, (err: Error, parsedHtml: string) => {
+        done();
+      });
+    });
+  });
+
+});