flip between internet explorer mode and edge

nginx.conf

# site needs to be in the configurable list
# follow this guide: https://learn.microsoft.com/en-us/deployedge/edge-learnmore-configurable-sites-ie-mode

http {
  server {
    set $ieaction '';
    if ( $http_x_internetexplorermodeconfigurable = 1) {
      set $ieaction "configurable+${ieaction}";
    }
    if ($http_x_internetexplorermodeconfigurable != 1) {
      set $ieaction "nonconfigurable+${ieaction}";
    }
    if ( $http_user_agent ~* Trident ) {
      set $ieaction "ie+${ieaction}";
    }
    if ( $http_user_agent !~* Trident ) {
      set $ieaction "nonie+${ieaction}";
    }

    # if IE mode desired:
    location /iemode {

      if ( $ieaction = 'nonie+nonconfigurable+') {
        return 402 'requires Internet Explorer mode';
      }
      if ( $ieaction = 'nonie+configurable+') {
        add_header X-InternetExplorerMode 1;
        return 302 $request_uri;
      }
    }
    
    # if Edge mode desired:
    location /edgemode {

      if ( $ieaction = 'ie+nonconfigurable+') {
        return 402 'requires non-internet explorer mode';
      }
      if ( $ieaction = 'ie+configurable+') {
        add_header X-InternetExplorerMode 0;
        return 302 $request_uri;
      }
    }
  }
}