Add req.host=

docs/api/request.md

@@ -60,6 +60,12 @@
   Get host void of port number when present. Supports `X-Forwarded-Host`
   when `app.proxy` is __true__, otherwise `Host` is used.
 
+### req.host=
+
+  Set host to a new value. It sets the `Host` header under the hood and will
+  behave correctly with req.subdomains.
+  This can be useful for a `hostOverride()` middleware
+
 ### req.type
 
   Get request `Content-Type` void of parameters such as "charset".

lib/request.js

@@ -189,6 +189,17 @@ module.exports = {
     return host.split(/\s*,\s*/)[0].split(':')[0];
   },
 
+  /**
+   * Set the host.
+   *
+   * @param {String} str
+   * @api public
+   */
+
+  set host(val) {
+    this.req.headers.host = val;
+  },
+
   /**
    * Check if the request is fresh, aka
    * Last-Modified and/or the ETag

test/request/host.js

@@ -28,4 +28,13 @@ describe('req.host', function(){
       })
     })
   })
-})
+})
+
+describe('req.host=', function(){
+  it('should replace the host', function(){
+    var req = request();
+    req.header['host'] = 'foo.com';
+    req.host = 'bar.com';
+    req.host.should.equal('bar.com')
+  })
+})