Messi was back to his best as he dribbled through the Huesca defence to make an opening.
In the 16th minute, the Argentine left several players behind with an impressive turn on the edge of the area.
Messi then found himself in lots of space, and shot across goal on his right foot before Etxeita could get a block in.
Goalkeeper Werner was unable to stop the finish, as the ball went in off the far post.
Just nine minutes later, the Catalan giants made it 2-1, as Alba got in behind the Huesca defence and pulled back at the by-line.
His cross did not reach any of his Barcelona teammates - instead, it was the unfortunate Huesca defender Pulido who got the final touch.
The ball bounced off his outstretched foot and past Werner in Huesca's goal.