// You can edit this code!
// Click here and start typing.
package main

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"time"
)

func main() {
	client := http.Client{
		Timeout: 1 * time.Millisecond,
	}
	b, err := json.Marshal(&struct{}{})
	if err != nil {
		panic(err)
	}
	_, err = client.Post("http://google.com", "application/json; charset=UTF-8", bytes.NewBuffer(b))
	if err != nil {
		switch {
		case errors.Is(err, context.DeadlineExceeded):
			fmt.Println("server took too long!") // Expected output
			return
		}
		panic("unexpected:" + err.Error())
	}
	fmt.Println("all good :)")
}

server took too long!

panic: unexpected:Post "http://google.com": context deadline exceeded (Client.Timeout exceeded while awaiting headers)

goroutine 1 [running]:
main.main()
        /home/pato/src/test/main.go:29 +0x1ac
exit status 2

(type:*url.Error):Post "http://google.com": context deadline exceeded (Client.Timeout exceeded while awaiting headers)(type:*http.httpError):context deadline exceeded (Client.Timeout exceeded while awaiting headers)