Starting with go1.21, GODEBUG is set by default according to the go line of
go.mod.
On Monday, February 12, 2024 at 11:47:31 AM UTC+8 xab3r wrote:
> 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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