title: Upgrade webapp Grails 2 to Grails 3 : cannot see index.html anymore
body: <p>I just updated my Grails 2 webapp project (Grails back end and Angular as front-end) to Grails 3. </p>
  
  <p>I moved all the web-app folder from my grails2 project to src/main/webapp (tried also in src/main/resources) folder.</p>
  
  <p>Now running bootRun --><a href="http://localhost:8080/" rel="nofollow">http://localhost:8080/</a> up and running</p>
  
  <p>Trying to access <a href="http://localhost:8080/index.html" rel="nofollow">http://localhost:8080/index.html</a> gets an error...</p>
  
  <p>What I meant is that I cannot access to my HTML files. I get an error : "This application has no explicit mapping for /error, so you are seeing this as a fallback." because I commented the error redirection in URLMappings. However, I do not understand why with Grails 3 my index.html is not accessible anymore while it worked ith Grails2 with the same configuration of URLMappings.</p>
  
  <p>Surely missing something but have no clue what ?</p>
  
  <p>Many thanks.</p>