## Mounting a **FastAPI** application { #mounting-a-fastapi-application }

"Mounting" means adding a completely "independent" application in a specific path, that then takes care of handling everything under that path, with the _path operations_ declared in that sub-application.

### Top-level application { #top-level-application }

        @DisplayName("Should return correct mime type for multiple extensions")
        @CsvSource({ "txt, text/plain", "css, text/css", "js, application/x-javascript", "zip, application/zip", "tar, application/x-tar",
                "gz, application/x-gzip", "tiff, image/tiff", "tif, image/tiff" })
        void testVariousExtensions(String extension, String expectedMimeType) throws IOException {
            assertEquals(expectedMimeType, mimeMap.getMimeType(extension));

import org.apache.maven.api.annotations.Nullable;

/**
 * Represents a hierarchical trace of nested requests within a session, enabling correlation between
 * session events and their originating operations in the application code. The trace structure
 * supports the following key features:
 *
 * <ul>
 *   <li>Maintains parent-child relationships between requests to track operation nesting</li>

Это не ограничение **FastAPI**, это часть протокола HTTP.

///

## Резюме

Ви можете оголосити кілька параметрів `Form`  в *операції шляху*, але не можете одночасно оголосити поля `Body`, які Ви очікуєте отримати у форматі JSON, оскільки тіло запиту буде закодовано у форматі `application/x-www-form-urlencoded`, а не `application/json`.

Це не обмеження **FastAPI**, а частина HTTP-протоколу.

///

## Підсумок

    /** The version of the Fess application. */
    protected String version;

    /** The major version number. */
    protected int majorVersion;

    /** The minor version number. */
    protected int minorVersion;

    /** The product version string. */
    protected String productVersion;

    /** The end-of-life timestamp for the application. */
    protected long eolTime;

        // Then
        assertNotNull(appKey, "Application key should not be null");
        assertEquals(16, appKey.length, "Application key should be 16 bytes");
        assertFalse(Arrays.equals(sessionKey, appKey), "Application key should be different from session key");
    }

    @Test
    @DisplayName("Should derive different application keys for different dialects")

Puedes declarar múltiples parámetros `Form` en una *path operation*, pero no puedes también declarar campos `Body` que esperas recibir como JSON, ya que el request tendrá el body codificado usando `application/x-www-form-urlencoded` en lugar de `application/json`.

Esto no es una limitación de **FastAPI**, es parte del protocolo HTTP.

///

## Recapitulación

/// warning

You can declare multiple `Form` parameters in a *path operation*, but you can't also declare `Body` fields that you expect to receive as JSON, as the request will have the body encoded using `application/x-www-form-urlencoded` instead of `application/json`.

This is not a limitation of **FastAPI**, it's part of the HTTP protocol.

///

## Recap { #recap }

        FessActionAdjustmentProvider provider = new FessActionAdjustmentProvider(fessConfig);
        final Map<String, String> headerMap = new HashMap<>();
        provider.adjustActionResponseHeaders("application/xml", (k, v) -> headerMap.put(k, v));
        assertEquals(2, headerMap.size());
        assertEquals("def", headerMap.get("X-Def"));
        assertEquals("def2", headerMap.get("X-Def2"));
    }