Hu Anyan is not a fan of online shopping, but, as he discovered during the months he spent as a courier in Beijing, plenty of people are. Not long into the job, he was assigned to delivering parcels to a large construction site. He didn’t have to deliver that many – 10 to 20, most days – but getting them to their rightful owners wasn’t always easy. There was a crane driver who was often in the air when Hu arrived. He would ask him to come again the next day,…