diff --git a/README.md b/README.md
index c693a2b..c7a889e 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ A simple web-server for productive front-end development. Typical use cases:
   * Mocks are defined with config (static), or code (dynamic).
   * CORS-friendly, all origins allowed by default.
 * Proxy server
-  * Map local routes to remote services. Removes CORS issues with remote servers.
+  * Map local routes to remote servers. Removes CORS pain when consuming remote services.
 * File sharing
 
 **Requires node v4.0.0 or higher**.
@@ -97,7 +97,7 @@ You're building a web app with client-side routing, so mark `index.html` as the
 $ ws --spa index.html
 ```
 
-By default, typical SPA urls (e.g. `/user/1`, `/login`) would return `404 Not Found` as a file does not exist with that path. By marking `index.html` as the SPA you create this rule:
+By default, typical SPA paths (e.g. `/user/1`, `/login`) would return `404 Not Found` as a file does not exist with that path. By marking `index.html` as the SPA you create this rule:
 
 *If a static file at the requested path exists (e.g. `/css/style.css`) then serve it, if it does not (e.g. `/login`) then serve the specified SPA and handle the route client-side.*
 
diff --git a/example/mock/.local-web-server.json b/example/mock/.local-web-server.json
index e0ef555..1865ed2 100644
--- a/example/mock/.local-web-server.json
+++ b/example/mock/.local-web-server.json
@@ -45,6 +45,10 @@
     {
       "route": "/five/:id\\?name=:name",
       "module": "/mocks/five.js"
+    },
+    {
+      "route": "/users*",
+      "module": "/mocks/users.js"
     }
   ]
 }
diff --git a/example/mock/mocks/users.js b/example/mock/mocks/users.js
new file mode 100644
index 0000000..08bc7e9
--- /dev/null
+++ b/example/mock/mocks/users.js
@@ -0,0 +1,34 @@
+const users = [
+  { id: 1, name: 'Lloyd', age: 40, nationality: 'English' },
+  { id: 2, name: 'Mona', age: 34, nationality: 'Palestinian' },
+  { id: 3, name: 'Francesco', age: 24, nationality: 'Italian' }
+]
+
+const mockResponses = [
+  { request: { method: 'PUT' }, response: { status: 400 } },
+  { request: { method: 'DELETE' }, response: { status: 400 } },
+  {
+    /* for GET requests, return a subset of data filtered on 'minAge' and 'nationality' */
+    request: { method: 'GET' },
+    response: function (ctx) {
+      ctx.body = users.filter(user => {
+        const meetsMinAge = user.age >= (Number(ctx.query.minAge) || 0)
+        const requiredNationality = user.nationality === (ctx.query.nationality || user.nationality)
+        return meetsMinAge && requiredNationality
+      })
+    }
+  },
+  {
+    /* for POST requests, create a new user with the request data (a JSON user) */
+    request: { method: 'POST' },
+    response: function (ctx) {
+      const newUser = ctx.request.body
+      users.push(newUser)
+      newUser.id = users.length
+      ctx.status = 201
+      ctx.response.set('Location', `/users/${newUser.id}`)
+    }
+  }
+]
+
+module.exports = mockResponses
diff --git a/jsdoc2md/README.hbs b/jsdoc2md/README.hbs
index 59cb2b9..2e21209 100644
--- a/jsdoc2md/README.hbs
+++ b/jsdoc2md/README.hbs
@@ -21,7 +21,7 @@ A simple web-server for productive front-end development. Typical use cases:
   * Mocks are defined with config (static), or code (dynamic).
   * CORS-friendly, all origins allowed by default.
 * Proxy server
-  * Map local routes to remote services. Removes CORS issues with remote servers.
+  * Map local routes to remote servers. Removes CORS pain when consuming remote services.
 * File sharing
 
 **Requires node v4.0.0 or higher**.
@@ -97,7 +97,7 @@ You're building a web app with client-side routing, so mark `index.html` as the
 $ ws --spa index.html
 ```
 
-By default, typical SPA urls (e.g. `/user/1`, `/login`) would return `404 Not Found` as a file does not exist with that path. By marking `index.html` as the SPA you create this rule:
+By default, typical SPA paths (e.g. `/user/1`, `/login`) would return `404 Not Found` as a file does not exist with that path. By marking `index.html` as the SPA you create this rule:
 
 *If a static file at the requested path exists (e.g. `/css/style.css`) then serve it, if it does not (e.g. `/login`) then serve the specified SPA and handle the route client-side.*
 
diff --git a/lib/middleware.js b/lib/middleware.js
index d76c0db..c4b88be 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -101,12 +101,14 @@ function mockResponses (route, targets) {
       }
 
       if (target) {
-        debug('target response: %j', target.response)
+        debug('target response: %s', target.response)
         if (t.isFunction(target.response)) {
           const pathMatches = ctx.url.match(pathRe).slice(1)
           target.response.apply(null, [ctx].concat(pathMatches))
-        } else {
+        } else if (t.isPlainObject(target.response)) {
           Object.assign(ctx.response, target.response)
+        } else {
+          throw new Error(`Invalid response: ${JSON.stringify(target.response)}`)
         }
 
       }