title: What application makes lots of HTTP OPTIONS requests?
body: <p>I have an IIS/MVC.Net application that has recorded thousands of action-not-found exceptions. When I investigated these it appears that they are all HTTP OPTIONS requests to an MVC action that only supports GET.</p>
  
  <p>This action allows caching and returns minified CSS or JS content. Within the application it's accessed by <code>&lt;link&gt;</code> and <code>&lt;script&gt;</code> tags in the <code>&lt;head&gt;</code>. The application is not making the requests and we haven't seen this in testing with any browser.</p>
  
  <p>What application is making all these OPTIONS requests?</p>
  
  <p>What is it expecting in return?</p>