nl_tokens: Load a tile with full fetchOptions .
pl_tokens: function authTileLoader ( fetchOptions ) { return function ( tile , src ) { fetch ( src , fetchOptions ) . then ( r => r . blob ( ) ) . then ( ( imgData ) => { tile . getImage ( ) . src = <mask> . createObjectURL ( imgData ) ; } ) . catch ( ( ) => { console . error ( 'Error fetchimg image at:' , src ) ; } ) ; } ; }