OpenGoo works pretty well on Apache 1.3 as far as I'm aware. There were some '405' errors that were fixed for next version, but otherwise I think that it works fine. What problems are you having there?
When we say that we recommend Apache 2.0+ or that we only support Apache 2.0+ we mean that we test it only under that web server, but thanks to the testing done by the community we are gradually improving support for other web servers too.