golang.org软件包和标准库之间的区别

Question

I've been using go for a short time now, and I've been noticing that there are duplicate packages between Go (standard library) and golang.org/x/.

My questions are: Why are they released twice? And of the two, which one should I use (more up-to-date, canonical, etc)?

Some sample packages that are released twice that I've noticed so far:

• golang.org/x/net/html vs net/html
• golang.org/x/crypto vs crypto
• and maybe more that I can't remember right now...

Answer 1

https://github.com/golang/go/wiki/SubRepositories

These packages are part of the Go Project but outside the main Go tree. They are developed under looser compatibility requirements than the Go core.

Use the standard library packages unless you have a strong need to use the /x/ variant and can accept the risk of breaking changes.