Visa requirements depend on a lot of things, including obviously what passport you hold (multiple selection), there's transit issues too -- if you hold an Afghan passport you can travel to Svalbard without a visa, but you can't fly there from Oslo because that requires a Schengen visa. In fact you can't even transit airside at Schipol. However if you hold a specific type of Canada residency permit you can.

And even once you clear the visa problems, you then get into yellow fever documentation. Do you need to take a yellow fever certificate if you transit via Addis Abiba on the way to South Africa?