type headerRewriter struct{}

// Clean up IP in case if it is ipv6 address and it has {zone} information in it, like
// "[fe80::d806:a55d:eb1b:49cc%vEthernet (vmxnet3 Ethernet Adapter - Virtual Switch)]:64692"
func ipv6fix(clientIP string) string {
	return strings.Split(clientIP, "%")[0]
}

func (rw *headerRewriter) Rewrite(req *http.Request) {

RUN Get-NetAdapter | Where-Object Name -like "*Ethernet*" | ForEach-Object { \
        & netsh interface ipv4 set subinterface $_.InterfaceIndex mtu=1460 store=persistent }; \
    $gateway = (Get-NetRoute | Where { $_.DestinationPrefix -eq \"0.0.0.0/0\" } | Sort-Object RouteMetric \
        | Select NextHop).NextHop; \
    $ifIndex = (Get-NetAdapter -InterfaceDescription \"Hyper-V Virtual Ethernet*\" | Sort-Object \
        | Select ifIndex).ifIndex; \

  # Before setting up HNS the Windows VM has a "vEthernet (nat)" interface and
  # a "Ethernet" interface, and the route to the metadata server exists on the
  # Ethernet interface. After adding the HNS network a "vEthernet (Ethernet)"
  # interface is added, and it seems to subsume the routes of the "Ethernet"
  # interface (trying to add routes on the Ethernet interface at this point just

	"sync"
	"sync/atomic"
)

// The size of a CRC-32 checksum in bytes.
const Size = 4

// Predefined polynomials.
const (
	// IEEE is by far and away the most common CRC-32 polynomial.
	// Used by ethernet (IEEE 802.3), v.42, fddi, gzip, zip, png, ...
	IEEE = 0xedb88320

	// Castagnoli's polynomial, used in iSCSI.
	// Has better error detection characteristics than IEEE.
	// https://dx.doi.org/10.1109/26.231911

	//Network Adapter:  Bluetooth Device (Personal Area Network)
	//Physical Address: N/A
	//Transport Name:   Hardware not present
	//
	//Connection Name:  VMware Network Adapter VMnet8
	//Network Adapter:  VMware Virtual Ethernet Adapter for VMnet8
	//Physical Address: Disabled
	//Transport Name:   Disconnected
	//
	want := make(map[string]string)
	group := make(map[string]string) // name / values for single adapter

     */
    const val CANCEL_AFTER_CLOSE_MILLIS = 60L * 1000

    /**
     * The smallest message that will be compressed. We use 1024 because smaller messages already
     * fit comfortably within a single ethernet packet (1500 bytes) even with framing overhead.
     *
     * For tests this must be big enough to realize real compression on test messages like

	if _, err := c.Write(b); err != nil {
		return dnsmessage.Parser{}, dnsmessage.Header{}, err
	}

	b = make([]byte, 1280) // 1280 is a reasonable initial size for IP over Ethernet, see RFC 4035
	if _, err := io.ReadFull(c, b[:2]); err != nil {
		return dnsmessage.Parser{}, dnsmessage.Header{}, err
	}
	l := int(b[0])<<8 | int(b[1])
	if l > len(b) {
		b = make([]byte, l)
	}

000000a0  30 11 06 03 55 04 08 13  0a 53 6f 6d 65 2d 53 74  |0...U....Some-St|
000000b0  61 74 65 31 21 30 1f 06  03 55 04 0a 13 18 49 6e  |ate1!0...U....In|
000000c0  74 65 72 6e 65 74 20 57  69 64 67 69 74 73 20 50  |ternet Widgits P|
000000d0  74 79 20 4c 74 64 30 1e  17 0d 31 32 31 31 32 32  |ty Ltd0...121122|
000000e0  31 35 30 36 33 32 5a 17  0d 32 32 31 31 32 30 31  |150632Z..2211201|

000000a0  30 11 06 03 55 04 08 13  0a 53 6f 6d 65 2d 53 74  |0...U....Some-St|
000000b0  61 74 65 31 21 30 1f 06  03 55 04 0a 13 18 49 6e  |ate1!0...U....In|
000000c0  74 65 72 6e 65 74 20 57  69 64 67 69 74 73 20 50  |ternet Widgits P|
000000d0  74 79 20 4c 74 64 30 1e  17 0d 31 32 31 31 32 32  |ty Ltd0...121122|
000000e0  31 35 30 36 33 32 5a 17  0d 32 32 31 31 32 30 31  |150632Z..2211201|

000000a0  30 11 06 03 55 04 08 13  0a 53 6f 6d 65 2d 53 74  |0...U....Some-St|
000000b0  61 74 65 31 21 30 1f 06  03 55 04 0a 13 18 49 6e  |ate1!0...U....In|
000000c0  74 65 72 6e 65 74 20 57  69 64 67 69 74 73 20 50  |ternet Widgits P|
000000d0  74 79 20 4c 74 64 30 1e  17 0d 31 32 31 31 32 32  |ty Ltd0...121122|
000000e0  31 35 30 36 33 32 5a 17  0d 32 32 31 31 32 30 31  |150632Z..2211201|