add additional node.js aliases

lib/context.js

@@ -110,7 +110,7 @@ module.exports = {
   get status() {
     return this.res.statusCode;
   },
-  
+
   get statusCode() {
     return this.res.statusCode;
   },
@@ -134,7 +134,7 @@ module.exports = {
     var noContent = 304 == this.status || 204 == this.status;
     if (noContent && this.body) this.body = null;
   },
-  
+
   set statusCode(val) {
     this.status = val;
   },
@@ -614,7 +614,7 @@ module.exports = {
   get headerSent() {
     return this.res.headersSent;
   },
-  
+
   get headersSent() {
     return this.res.headersSent;
   },
@@ -896,6 +896,57 @@ module.exports = {
     }
   },
 
+  setHeader: function(field, val){
+    this.set(field, val);
+  },
+
+  /**
+   * Get the current response header `name`.
+   *
+   * @param {String} name
+   * @api public
+   */
+
+  getHeader: function(name){
+    return this.res.getHeader(name);
+  },
+
+  /**
+   * Remove the current response header `name`.
+   *
+   * @param {String} name
+   * @api public
+   */
+
+  removeHeader: function(name){
+    return this.res.removeHeader(name);
+  },
+
+  /**
+   * Get the trailing headers to a request.
+   *
+   * @param {Object}
+   * @api public
+   */
+
+  get trailers() {
+    return this.req.trailers;
+  },
+
+  /**
+   * Add trailing headers to the response.
+   *
+   * Maybe:
+   *   - throw if not chunked encoding
+   *
+   * @param {object} headers
+   * @api public
+   */
+
+  addTrailers: function(headers){
+    return this.res.addTrailers(headers);
+  },
+
   /**
    * Append `val` to header `field`.
    *