How to provide a slight curve to links - GoJS - Northwoods Software

I have a simple diagram where I want links to extend about 20 px straight out of the node’s fromPort before curving, and then straightening again 20 px before entering the toPort. I tried a few things to get this effect but wasn’t quite satisfied. I first tried to use curve: go.Link.Bezier with varying fromEndSegmentLength and toEndSegmentLength, but the ends of the link never seemed to be really straight (the first link in my image). Then I just tried to use curve: go.Link.None and the corner

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