This is actually a decent fight IMO. Spidey has a speed and agility advantage, but he will have to get up close to try and do some damage, and Heimdall has a large pointy sword and knows how to use it. He could potentially try webbing him up, but I am not sure it would work considering how Heimdall hulk'd out of the Casket of Ancient Winter's ice. Hell, Heimdall has an Asgardian blade, so he could probably just slice through the webbing.