One thing you definitely want to make sure is the simple fact that he can not make on your creep. So one thing that you need to do if you sense this is coming is to enlarge your creep and make sure they can not build the structures at your creep.
Make Sure you Are Scouting Your Opponent Right
This step is very critical as you want to make sure that you are investigating what's going on around you, taking on the ramp of your base in which your opponent may be building their potential cannon rush.
When you find that there is a structure warping in (it's probably a pylon and a photon cannon), you want to make a point that you surround it with your workers and destroy the power pylon immediately. His supply cap will be screwed up and you'll decidedly have a big time economic vantage.
You are simply going to want to realize that his economy is probably complete trash. He has closed off your ramp so that you can not bring in any ground troops for the time being. A smooth way to counter this is just to realize his minimal forces, and get a few mutalisks to fly over and harass your opponent.
You can also try out the nydus worm to harass, and to also build a second hatchery so that you can have better unit production, and you are going to require that second hatchery to exceed your unit in production.
You can too use your overlords to gain both supplying count and to scout out your opponent, but if you prevent him from expanding, you are pretty well in economic terms and you are even better because you can go ahead and try to ruin his mineral line while he is trying to do some soft cheesy rush on you.
So don't do anything curious and rush the cannons, simply be patient, tech up to mutalisk and own your opponent.
Expert Terran, Zerg, Protoss build orders. Knowing every of these three races and their personal units including the unit's strengths, weaknesses, countering & detailed strategy for each single unit vs. every other unit is imperative to master Starcraft 2 Online.
