title: Problems with Go Appengine endpoint tests
body: <p>I am trying to create an endpoint test when using appengine. Unfortunately, the tests keep failing because of the lack of a schema (and host) within the url used when creating the test <code>*Request</code> struct. When running appengine tests a server is spawned for that specific test that runs on a semi-random port number, which makes it seemingly impossible to define the full url to perform the test on.</p>
  
  <p>The <a href="https://cloud.google.com/appengine/docs/go/tools/localunittesting/" rel="nofollow">official docs</a> on running tests like this are very sparse and only give half of an example, so I am left scratching my head on how to get this to work.</p>
  
  <p>This is the error that I get from the marked line within the code snippet
  <code>
  Error: Received unexpected error "Post /auth: unsupported protocol scheme \"\""
  </code></p>
  
  <p><strong>Test Code</strong></p>
  
  <pre><code>func TestEndpoints_Auth(t *testing.T) {
  
      // input data
      account := Account{
          AuthProvider:   "facebook",
          AuthProviderId: "123345456",
      }
      b, _ := json.Marshal(&amp;account)
      reader := bytes.NewReader(b)
  
      // test server
      inst, err := aetest.NewInstance(nil)
      if !assert.NoError(t, err) { return }
      defer inst.Close()
  
      // request
      client := http.Client{}
      req, err := inst.NewRequest("POST", "/auth", reader)
      if !assert.NoError(t, err) { return }
      req.Header.Add(AppAuthToken, "foobar")
      resp, err := client.Do(req)
      if !assert.NoError(t, err) { return }   // &lt;=== Where the error occurs
  
      // tests
      if !assert.Nil(t, err) { return }
      assert.Equal(t, http.StatusCreated, resp.StatusCode)
  }
  </code></pre>
  
  <p>Logs
  <code>
  [GIN-debug] POST   /auth                     --&gt; bitbucket.org/chrisolsen/chriscamp.(*endpoints).Auth-fm (5 handlers)
  [GIN-debug] GET    /accounts/me              --&gt; bitbucket.org/chrisolsen/chriscamp.(*endpoints).GetMyAccount-fm (7 handlers)
  INFO     2016-04-22 13:23:39,278 devappserver2.py:769] Skipping SDK update check.
  WARNING  2016-04-22 13:23:39,278 devappserver2.py:785] DEFAULT_VERSION_HOSTNAME will not be set correctly with --port=0
  WARNING  2016-04-22 13:23:39,345 simple_search_stub.py:1126] Could not read search indexes from c:\users\chris\appdata\local\temp\appengine.testapp\search_indexes
  INFO     2016-04-22 13:23:39,354 api_server.py:205] Starting API server at: http://localhost:54461
  INFO     2016-04-22 13:23:41,043 dispatcher.py:197] Starting module "default" running at: http://localhost:54462
  INFO     2016-04-22 13:23:41,046 admin_server.py:116] Starting admin server at: http://localhost:54466
  </code></p>