Arrays.fill(buffer, headerStart + 48, headerStart + 64, (byte) 0);

        // Write READ response body
        int dataLength = 20;
        int dataRemaining = 0;
        int dataOffsetFromHeader = 80;

        // Structure size (17 = 0x11)
        SMBUtil.writeInt2(17, buffer, bodyStart);
        // Data offset (byte - offset from header start)
        buffer[bodyStart + 2] = (byte) dataOffsetFromHeader;

    assertUnescaped(e, '*');

    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000
    assertEscaping(e, "%EF%BF%BF", '\uffff'); // xxx-1111,x-111111,x-11,1111

            "steps": [
              {
                "color": "green",
                "value": null
              },
              {
                "color": "semi-dark-red",
                "value": 80
              }
            ]
          }
        },
        "overrides": []
      },
      "gridPos": {
        "h": 6,
        "w": 12,
        "x": 0,
        "y": 0
      },
      "id": 52,

    assertUnescaped(e, '*');

    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000
    assertEscaping(e, "%EF%BF%BF", '\uffff'); // xxx-1111,x-111111,x-11,1111

    val address = factory.newAddress()
    assertThat(address.toString())
      .isEqualTo("Address{example.com:80, proxySelector=RecordingProxySelector}")
  }

  @Test fun addressWithProxyToString() {
    val address = factory.newAddress(proxy = Proxy.NO_PROXY)
    assertThat(address.toString())
      .isEqualTo("Address{example.com:80, proxy=${Proxy.NO_PROXY}}")
  }

            "steps": [
              {
                "color": "green",
                "value": null
              },
              {
                "color": "red",
                "value": 80
              }
            ]
          },
          "unit": "short"
        },
        "overrides": [
          {
            "matcher": {
              "id": "byName",

        // Set buffer offset
        SMBUtil.writeInt2(80, buffer, bufferIndex + 2);
        // Set buffer length with data
        SMBUtil.writeInt4(100, buffer, bufferIndex + 4);

        response = spy(response);
        when(response.getHeaderStart()).thenReturn(0);

        // Write some data that would be a valid entry
        SMBUtil.writeInt4(0, buffer, 80); // NextEntryOffset

## 步驟 { #steps }

假設你的前端在瀏覽器中執行於 `http://localhost:8080`，其 JavaScript 嘗試與執行在 `http://localhost` 的後端通訊（因為未指定連接埠，瀏覽器會假設預設連接埠為 `80`）。

接著，瀏覽器會向 `:80` 的後端送出一個 HTTP `OPTIONS` 請求；若後端回傳適當的標頭，授權此不同來源（`http://localhost:8080`）的通訊，則在 `:8080` 的瀏覽器就會允許前端的 JavaScript 向 `:80` 的後端送出它的請求。

為了達成這點，`:80` 的後端必須有一份「允許的來源」清單。

在此情況下，該清單必須包含 `http://localhost:8080`，` :8080` 的前端才能正確運作。

## 萬用字元 { #wildcards }

export IP_ADDR=$(powershell -command "(Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias 'vEthernet (nat)').IPAddress")
netsh interface portproxy add v4tov4 listenaddress=$IP_ADDR listenport=80 connectaddress=169.254.169.254 connectport=80
# A local firewall rule for the container is added in

Then, the browser will send an HTTP `OPTIONS` request to the `:80`-backend, and if the backend sends the appropriate headers authorizing the communication from this different origin (`http://localhost:8080`) then the `:8080`-browser will let the JavaScript in the frontend send its request to the `:80`-backend.

To achieve this, the `:80`-backend must have a list of "allowed origins".