pool

buf := GetBuf()
fmt.Printf("len: %v\n", len(buf))
fmt.Printf("cap: %v\n", cap(buf))

buf2 := buf[1024:]
fmt.Printf("len: %v\n", len(buf2))
fmt.Printf("cap: %v\n", cap(buf2))

bufReader := bytes.NewBuffer(buf2)
bufReader.Reset()
fmt.Println(bufReader.Len())
fmt.Printf("len: %v\n", len(buf2))
fmt.Printf("cap: %v\n", cap(buf2))

Output:
len: 4096
cap: 4096
len: 3072
cap: 3072