### Injeção de dependência { #dependency-injection }

FastAPI inclui um sistema de <dfn title='também conhecido como "componentes", "recursos", "serviços", "provedores"'><strong>injeção de dependência</strong></dfn> extremamente fácil de usar, mas extremamente poderoso.

* Mesmo dependências podem ter dependências, criando uma hierarquia ou **"grafo" de dependências**.

     * Returns the plugin context for given key ({@link PluginDescriptor#getPluginLookupKey()} and
     * {@link MavenProject}, never returns {@code null} as if context not present, creates it.
     *
     * <strong>Implementation note:</strong> while this method return type is {@link Map}, the returned map instance
     * implements {@link ConcurrentMap} as well.
     *
     */

        // Replace with second customizer
        pagerCreator.setPagerCustomizer(customizer2);
        assertSame(customizer2, pagerCreator.getPagerCustomizer());
    }

    // Test setting null customizer
    @Test
    public void test_setPagerCustomizer_null() {
        // Create and set a customizer
        ComponentCustomizer customizer = new ComponentCustomizer() {
            @Override

    /**
     * Returns true if the call should retry on connection failures.
     */
    val retryOnConnectionFailure: Boolean

    /**
     * Returns a new chain with the specified retry on connection failure setting.
     */
    fun withRetryOnConnectionFailure(retryOnConnectionFailure: Boolean): Chain

    /**
     * Returns the [Authenticator] for the OkHttpClient, or an override from the Call.Chain.
     */

        String configParam = "new.param=value\nconfig.setting=true";
        ParameterUtil.loadConfigParams(targetMap, configParam);
        assertEquals(3, targetMap.size());
        assertEquals("value", targetMap.get("existing"));
        assertEquals("value", targetMap.get("new.param"));
        assertEquals("true", targetMap.get("config.setting"));
    }

    @Test

MINIO_IDENTITY_OPENID_REDIRECT_URI_DYNAMIC  (on|off)    Enable 'Host' header based dynamic redirect URI (default: 'off')
MINIO_IDENTITY_OPENID_COMMENT               (sentence)  optionally add a comment to this setting
```

### Access Control Configuration Variables

    File tempFile = createTempFile();
    PrintWriter writer = new PrintWriter(tempFile, "UTF-8");
    writer.println("rud a chur ar an méar fhada");
    writer.close();

    // First check that we can't find it without setting the context loader.
    // This is a sanity check that the test doesn't spuriously pass because
    // the resource is visible to the system class loader.

```

Default config includes most common highly compressible content extensions and mime-types.

```bash
~ mc admin config set myminio compression extensions=".pdf" mime_types="application/pdf"
```

To show help on setting compression config values.

```bash
~ mc admin config set myminio compression
```

To enable compression for all content, no matter the extension and content type

    #  This property is valid only when isGenerateProcedureParameterBean is valid.
    #   e.g. list:{prefix:SP_}
    #  And you can specify procedures through DB link.
    #  This is treated as additional setting
    #  so it is independent from specifications for main schema.
    #   e.g. SP_FOO@NEXT_LINK (when DB link name is 'NEXT_LINK')  
    #

* `skip=20`: because you set it in the URL
* `limit=10`: because that was the default value

## Optional parameters { #optional-parameters }

The same way, you can declare optional query parameters, by setting their default to `None`:

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

In this case, the function parameter `q` will be optional, and will be `None` by default.

/// check