* <code>null</code> is returned.
     *
     * @return URL to the DFS volume
     */
    String getDfsPath();

    /**
     * Returns the transport port number for this SMB resource connection.
     *
     * @return the transport port, if specified
     */
    int getPort();

    /**
     * Returns the original URL object used to create this SMB resource.
     *
     * @return the original URL

    private static final long BASE_ERROR_DELAY = 1000;
    private static final int MAX_FAILURE_LIMIT = 5; // Limit failures for backoff calculation

    private final InetAddress witnessServer;
    private final int port;
    private final CIFSContext context;
    private final ConcurrentHashMap<String, WitnessRegistration> registrations;
    private final ConcurrentHashMap<String, WitnessNotificationListener> listeners;

            doColumn("parameters");
        }

        public void columnPassword() {
            doColumn("password");
        }

        public void columnPort() {
            doColumn("port");
        }

        public void columnProtocolScheme() {
            doColumn("protocolScheme");
        }

        public void columnUpdatedBy() {
            doColumn("updatedBy");
        }

        auth.setPort(8080);
        assertTrue(auth.matches("ftp://hostname:8080/test/aaa.html"));
        assertFalse(auth.matches("ftp://hostname:21/test/aaa.html"));

        // Test with no port specified in FtpAuthentication
        auth.setPort(0);
        assertTrue(auth.matches("ftp://hostname:21/test/aaa.html"));
        assertTrue(auth.matches("ftp://hostname/test/aaa.html"));

## 建立和使用環境變數

你在 **shell（終端機）**中就可以**建立**和使用環境變數，並不需要用到 Python：

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 你可以使用以下指令建立一個名為 MY_NAME 的環境變數
$ export MY_NAME="Wade Wilson"

// 然後，你可以在其他程式中使用它，例如
$ echo "Hello $MY_NAME"

Hello Wade Wilson
```

</div>

////

//// tab | Windows PowerShell

<div class="termy">

```console

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// Sie könnten eine Umgebungsvariable MY_NAME erstellen mittels
$ export MY_NAME="Wade Wilson"

// Dann könnten Sie diese mit anderen Programmen verwenden, etwa
$ echo "Hello $MY_NAME"

Hello Wade Wilson
```

</div>

////

//// tab | Windows PowerShell

    void testContextInformation() {
        // Given
        Map<String, Object> initialContext = new HashMap<>();
        initialContext.put("host", "server.example.com");
        initialContext.put("port", 445);

        exception = new SmbOperationException(SmbOperationException.ErrorCode.ACCESS_DENIED, "Permission denied", null,
                SmbOperationException.RetryPolicy.DEFAULT, initialContext);

        // When

            doColumn("parameters");
        }

        public void columnPassword() {
            doColumn("password");
        }

        public void columnPort() {
            doColumn("port");
        }

        public void columnProtocolScheme() {
            doColumn("protocolScheme");
        }

        public void columnUpdatedBy() {
            doColumn("updatedBy");
        }

</div>

...または、これら以外のASGIサーバ。

////

そして、チュートリアルと同様な方法でアプリケーションを起動して下さい。ただし、以下の様に`--reload` オプションは使用しないで下さい:

//// tab | Uvicorn

<div class="termy">

```console
$ uvicorn main:app --host 0.0.0.0 --port 80

<span style="color: green;">INFO</span>:     Uvicorn running on http://0.0.0.0:80 (Press CTRL+C to quit)
```

</div>

////

//// tab | Hypercorn

<div class="termy">

```console

//// tab | লিনাক্স, ম্যাকওএস, উইন্ডোজ Bash

<div class="termy">

```console
// আপনি চাইলে MY_NAME নামে একটি env var তৈরি করতে পারেন
$ export MY_NAME="Wade Wilson"

// তারপরে এটিকে চাইলে অন্যান্য প্রোগ্রামে ব্যবহার করতে পারেন
$ echo "Hello $MY_NAME"

Hello Wade Wilson
```

</div>

////

//// tab | উইন্ডোজ পাওয়ারশেল