*
     * @param contextHandle the context handle from registration
     */
    public WitnessUnregisterMessage(byte[] contextHandle) {
        super(WITNESS_UNREGISTER);
        this.contextHandle = contextHandle != null ? contextHandle.clone() : new byte[20];
    }

    /**
     * Sets the context handle for unregistration.
     *
     * @param contextHandle the context handle from registration
     */

Read more about it in the [FastAPI docs for Testing](https://fastapi.tiangolo.com/tutorial/testing/).

You can import it directly from `fastapi.testclient`:

```python
from fastapi.testclient import TestClient
```

    "paid": true
}
```

and it would expect a response from that *external API* with a JSON body like:

```JSON
{
    "ok": true
}
```

/// tip

Notice how the callback URL used contains the URL received as a query parameter in `callback_url` (`https://www.external.org/events`) and also the invoice `id` from inside of the JSON body (`2expen51ve`).

///

    }

    /**
     * Returns a {@link CopyOptions} with the specified property names to exclude from the operation.
     *
     * @param propertyNames
     *            An array of property names. Must not be {@literal null} or an empty array.
     * @return A {@link CopyOptions} with the specified property names to exclude from the operation.
     * @see CopyOptions#exclude(CharSequence...)
     */

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

And all of them can use `yield`.

In this case `dependency_c`, to execute its exit code, needs the value from `dependency_b` (here named `dep_b`) to still be available.

And, in turn, `dependency_b` needs the value from `dependency_a` (here named `dep_a`) to be available for its exit code.

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[18:19,26:27] *}

            xpathAPI.remove();
        }
    }

    /**
     * Extracts strings from a document using the specified XPath expression.
     *
     * @param document the DOM document to extract strings from
     * @param path the XPath expression to evaluate
     * @return an array of strings extracted from the document
     */
    protected String[] getStringsByXPath(final Document document, final String path) {

    protected int parameterCount;
    /** Offset from the start of the SMB header to the parameter bytes */
    protected int parameterOffset;
    /** Displacement of these parameter bytes from the start of the total parameter block */
    protected int parameterDisplacement;
    /** Number of data bytes being sent in this request */
    protected int dataCount;
    /** Offset from the start of the SMB header to the data bytes */

        }
        return null;
    }

    /**
     * Extracts URLs from HTML tag attributes using XPath.
     *
     * @param url the base URL for resolving relative URLs
     * @param document the document to extract URLs from
     * @param xpath the XPath expression to select elements
     * @param attr the attribute name to extract URLs from
     * @param encoding the character encoding to use

    protected abstract void encodeWitnessParameters(NdrBuffer buf) throws NdrException;

    /**
     * Decodes the witness RPC message parameters from NDR format.
     * Subclasses must implement this method to decode their specific parameters.
     *
     * @param buf the NDR buffer to decode from
     * @throws NdrException if decoding fails
     */
    protected abstract void decodeWitnessParameters(NdrBuffer buf) throws NdrException;

///

## Run your code with your debugger { #run-your-code-with-your-debugger }

Because you are running the Uvicorn server directly from your code, you can call your Python program (your FastAPI application) directly from the debugger.

---

For example, in Visual Studio Code, you can:

* Go to the "Debug" panel.
* "Add configuration...".
* Select "Python"