/// info

`Query`, `Path`, and other classes you will see later are subclasses of a common `Param` class.

All of them share the same parameters for additional validation and metadata you have seen.

///

/// note | Technical Details

When you import `Query`, `Path` and others from `fastapi`, they are actually functions.

That when called, return instances of classes of the same name.

* <a href="https://github.com/encode/uvicorn/blob/master/uvicorn/middleware/proxy_headers.py" class="external-link" target="_blank">Uvicorn's `ProxyHeadersMiddleware`</a>
* <a href="https://github.com/florimondmanca/msgpack-asgi" class="external-link" target="_blank">MessagePack</a>

    assertEquals("abc.d.Abc", ClassPath.getClassName("abc/d/Abc.class"));
  }

  public void testResourceInfo_of() {
    assertThat(resourceInfo(ClassPathTest.class)).isInstanceOf(ClassInfo.class);
    assertThat(resourceInfo(ClassPath.class)).isInstanceOf(ClassInfo.class);
    assertThat(resourceInfo(Nested.class)).isInstanceOf(ClassInfo.class);
  }

  public void testGetSimpleName() {

```java
// Use with SLF4J (add slf4j-api dependency)
Logger logger = Logger.getLogger(MyClass.class);

// Use with Commons Logging (add commons-logging dependency)  
Logger logger = Logger.getLogger(MyClass.class);

// Use with Java Util Logging (built-in)
Logger logger = Logger.getLogger(MyClass.class.getName());
```

### Bean Copy Configuration
```java
// Configure bean copying behavior

  public void testToStringHelperLenient_localInnerClass() {
    class LocalInnerClass {}
    String toTest = MoreObjects.toStringHelper(new LocalInnerClass()).toString();
    assertTrue(toTest, toTest.matches(".*\\{\\}"));
  }

  @GwtIncompatible // Class names are obfuscated in GWT
  public void testToStringHelper_localInnerNestedClass() {
    class LocalInnerClass {
      class LocalInnerNestedClass {}
    }
    String toTest =

To use, first add this library as a test dependency:

```
testImplementation("com.squareup.okhttp3:mockwebserver3-junit5:5.3.0")
```

Annotate fields in test classes with `@StartStop`. The server will be started and shut down
automatically.

```
class MyTest {

  @StartStop
  public final MockWebServer server = new MockWebServer();

  @Test
  void test() {
    ...
  }
}
```

Requirements

    @Test
    void testValueExtractionWithAPomValueContainingAPath() throws Exception {
        String expected = getTestFile("target/test-classes/target/classes").getCanonicalPath();

        Build build = new Build();
        build.setDirectory(expected.substring(0, expected.length() - "/classes".length()));

        Model model = new Model();
        model.setBuild(build);

        MavenProject project = new MavenProject(model);

    // fail and will need to be rewritten.

    Class<?> frqC = FinalizableReferenceQueue.class;
    Class<?> sepFrqC = sepLoader.loadClass(frqC.getName());
    assertThat(frqC).isNotSameInstanceAs(sepFrqC);
    // Check the assumptions above.

    // FRQ tries to load the Finalizer class (for the reference-collecting thread) in a few ways.
    // If the class is accessible to the system ClassLoader (ClassLoader.getSystemClassLoader())

{* ../../docs_src/first_steps/tutorial001_py39.py hl[1] *}

`FastAPI` é uma classe Python que fornece todas as funcionalidades para sua API.

/// note | Detalhes Técnicos

`FastAPI` é uma classe que herda diretamente de `Starlette`.

Você pode usar todas as funcionalidades do <a href="https://www.starlette.dev/" class="external-link" target="_blank">Starlette</a> com `FastAPI` também.

///

## A "callable" instance { #a-callable-instance }

In Python there's a way to make an instance of a class a "callable".

Not the class itself (which is already a callable), but an instance of that class.

To do that, we declare a method `__call__`:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[12] *}