title: where do i modify 'signin-google' in owin security for google redirect url?
body: <p>Im working on asp mvc 5 with google oauth login, 
  I followed a tutorial installing owin security and set the google redirect url to be localhost/myapp/signin-google,</p>
  
  <p>my question is where can i change the localhost/myapp/signin-google to be something else like localhost/myapp/mycallback ?</p>
  
  <p>i tried change is to be localhost/myapp/signup/ExternalLoginCallback which the actual action, but it didnt work, is 'signin-google' hardcoded in owin security??</p>