Sick of me yet? :)
I get hyperfocused trying to figure things out sometimes.
I can get the pastebin command working in Minecraft following these steps.
1. ComputerCraft mod installed on client and server
2. ComputerCraft.cfg file on both client and server has http enabled (set to true)
3. Log into Minecraft
4. Make (or CHEAT and get one from the Creative inventory :) ) a turtle and place it in the world. Or, just make a computer - I make turtles because I use them for mining.
5. Right click on the computer/turtle and a command window opens.
6. At the prompt, type
"rom/programs/http/pastebin get 3mkeUzby OreQuarry" without the quotes. That's going to download a program from pastebin.com/3mkeUzby.
If everything is set up in steps 1-5, step 6 should work.
Just tried issuing the command without the rom/programs/http path, and it also works - just > pastebin get 3mkeUzby Orequarry" will download the file referenced above.
If you write a program in-game and want to upload it to pastebin, save the file in-game and then use "pastebin put filename" and it will upload to pastebin.com for you and tell you the pastebin ID.
I don't think you need to use "http.get(url)" unless that's part of a program you're writing?