Häcken brought the game, but Djurgården was not harmless and just before the break they paid dividends.
Magnus Eriksson found Joel Asoro in the penalty area and then it was 1-0 to Djurgården. The home crowd was really upset after the goal when replay footage showed that Eriksson was in suspected offside when he received the ball from Gustav Wikheim.
"It came at the right time. It's about finishing until the referee blows," says Asoro, who scored his first goal in this year's Allsvenskan.
Häcken continued to press at the start of the second half and in the 53rd minute Lars Olden Larsen produced a huge performance. First he passed zookeepers nicely and then he pulled in a long shot elegantly behind Tommi Vaiho.
Häcken then turned too when defender Even Hovland nodded in a corner in the 67th minute.
With just over five minutes left of regular game time, things fizzled out. Hovland nodded in another corner and shortly afterwards it was Larsen's turn to elegantly make it 4-1.
Norwegian Larsen has been in incredible form in the season opener and has now scored four goals and five assists in Allsvenskan.
Häcken now leads Allsvenskan, with one game more played than Malmö. Djurgården suffered their third loss of the season.
"We have a great half and then it's street in the second. That is not good enough. It is so far from approved to be us, says Magnus Eriksson.