<span style="background-color:#007166"><font color="#D3D7CF"> app </font></span>  Using import string: <font color="#3465A4">main:app</font>

                                           GradientFunction, TapeTensor> {
 public:
  using GradientTape<AbstractTensorHandle, GradientFunction,
                     TapeTensor>::GradientTape;
  // Returns whether the tape is persistent, i.e., whether the tape will hold
  // onto its internal state after a call to `ComputeGradient`.
  using GradientTape<AbstractTensorHandle, GradientFunction,
                     TapeTensor>::IsPersistent;

import org.codelibs.fess.crawler.Constants;
import org.codelibs.fess.crawler.entity.RequestData;
import org.codelibs.fess.crawler.entity.RequestData.Method;

/**
 * Builder class for creating RequestData objects using a fluent interface.
 * This class provides a simple way to construct RequestData objects with method chaining.
 *
 * <p>Usage example:</p>
 * <pre>
 * RequestData request = RequestDataBuilder.newRequestData()

# OAuth2 with Password (and hashing), Bearer with JWT tokens { #oauth2-with-password-and-hashing-bearer-with-jwt-tokens }

Now that we have all the security flow, let's make the application actually secure, using <abbr title="JSON Web Tokens">JWT</abbr> tokens and secure password hashing.

This code is something you can actually use in your application, save the password hashes in your database, etc.

 * @author Louis Wasserman
 */
@GwtIncompatible
public class ListMultimapTestSuiteBuilder<K, V>
    extends MultimapTestSuiteBuilder<K, V, ListMultimap<K, V>> {

  public static <K, V> ListMultimapTestSuiteBuilder<K, V> using(
      TestListMultimapGenerator<K, V> generator) {
    ListMultimapTestSuiteBuilder<K, V> result = new ListMultimapTestSuiteBuilder<>();
    result.usingGenerator(generator);
    return result;
  }

        .withTearDown(parentBuilder.getTearDown())
        .createTestSuite();
  }

  /** Like using() but overrideable by NavigableSetTestSuiteBuilder. */
  SortedSetTestSuiteBuilder<E> newBuilderUsing(
      TestSortedSetGenerator<E> delegate, Bound to, Bound from) {
    return using(new SortedSetSubsetTestSetGenerator<E>(delegate, to, from));
  }

        .withTearDown(parentBuilder.getTearDown())
        .createTestSuite();
  }

  /** Like using() but overrideable by NavigableSetTestSuiteBuilder. */
  SortedSetTestSuiteBuilder<E> newBuilderUsing(
      TestSortedSetGenerator<E> delegate, Bound to, Bound from) {
    return using(new SortedSetSubsetTestSetGenerator<E>(delegate, to, from));
  }

You can learn how to [install `@hey-api/openapi-ts`](https://heyapi.dev/openapi-ts/get-started) and read about the [generated output](https://heyapi.dev/openapi-ts/output) on their website.

### Using the SDK { #using-the-sdk }

Now you can import and use the client code. It could look like this, notice that you get autocompletion for the methods:

<img src="/img/tutorial/generate-clients/image02.png">

## Get the `username` and `password` { #get-the-username-and-password }

We are going to use **FastAPI** security utilities to get the `username` and `password`.

OAuth2 specifies that when using the "password flow" (that we are using) the client/user must send a `username` and `password` fields as form data.

And the spec says that the fields have to be named like that. So `user-name` or `email` wouldn't work.

$ echo "no" | avdmanager --verbose create avd --force --name "pixel5" --device "pixel" --package "system-images;android-29;google_apis;x86" --tag "google_apis" --abi "x86"
```

2. Run an Emulator using Android Studio or from command line.

```
$ emulator -no-window -no-snapshot-load @pixel5
```

2. Turn on logs with logcat

```