Hello there
I've just tried new routing patterns in Go 1.22.0, and I noticed that I
have to set httpmuxgo121=0 explicitly in order to get it enabled. When the
release notes say to "set httpmuxgo121=1 to restore the old behaviour". So,
as I understand it, by default, it should work with new path patterns.
This is the handler
```
mux.HandleFunc("GET /hello", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "Hello")
})
```
So this piece of code is not gonna work if I run it like this
`$ go run main.go`
The server responds with 404.
But it's working as expected when I explicitly set httpmuxgo121 to 0
`$ GODEBUG=httpmuxgo121=0 go run main.go`
Also, I compiled go from sources with extra logs and `use121` variable
https://github.com/golang/go/blob/master/src/net/http/servemux121.go#L23
is set to 1 by default, when I don't specify it explicitly via the ENV
variable.
What's the correct behaviour? Any clues are welcome
Thanks
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