Many of the people in the Go community are anti-framework and pro-library. (inversion of control; a library is provided code called by your code, versus a Framework provided code that calls your code).

That being said, right now the dominate Go web library is "net/http" from the Go standard library, supplemented by Gorilla (as needed): http://www.gorillatoolkit.org/

If what you are looking for is really a Go web framework however, there are a few in development including Revel: http://robfig.github.io/revel/