* Decompressing gzip-compressed request bodies.
* Automatically logging all request bodies.

## Handling custom request body encodings { #handling-custom-request-body-encodings }

Let's see how to make use of a custom `Request` subclass to decompress gzip requests.

And an `APIRoute` subclass to use that custom request class.

			// mime package in MinIO, which correctly encodes strings with fixed B/Q encodings,
			// avoiding S3’s heuristic-driven issues.
			//
			// For MinIO developers, decode S3 metadata with mime.WordDecoder, validate outputs,
			// report encoding bugs to AWS, and use ASCII-only metadata to ensure reliable S3 API
			// compatibility.
			if needsMimeEncoding(v) {

But when the form includes files, it is encoded as `multipart/form-data`. You'll read about handling files in the next chapter.

If you want to read more about these encodings and form fields, head to the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST" class="external-link" target="_blank"><abbr title="Mozilla Developer Network">MDN</abbr> web docs for <code>POST</code></a>.

///

/// warning

 * the tests create a mock {@link Configuration} and instantiate SmbComQueryInformation
 * directly.  Since the byte‑encoding logic is located in the superclass, the
 * tests verify that the byte buffer created by {@link
 * SmbComQueryInformation#writeBytesWireFormat(byte[], int)} is correctly built
 * for both Unicode and OEM encodings.
 */
@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)

        verify(mockNdrBuffer).enc_ndr_referent(shareInfo502.security_descriptor, 1);

        // Verify string encodings
        verify(mockDeferredBuffer, times(4)).enc_ndr_string(anyString());

        // Verify security descriptor encoding
        verify(mockDeferredBuffer).enc_ndr_long(2);
        verify(mockDeferredBuffer).advance(2);
        verify(mockDeferredBuffer).enc_ndr_small((byte) 1);

But when the form includes files, it is encoded as `multipart/form-data`. If you use `File`, **FastAPI** will know it has to get the files from the correct part of the body.

If you want to read more about these encodings and form fields, head to the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST" class="external-link" target="_blank"><abbr title="Mozilla Developer Network">MDN</abbr> web docs for <code>POST</code></a>.

///

            // Verify reserved section is zero
            assertEquals(0, SMBUtil.readInt4(buffer, 20));
        }

        @Test
        @DisplayName("Should handle multiple sequential encodings")
        void testMultipleSequentialEncodings() {
            // Given
            SrvCopychunk chunk1 = new SrvCopychunk(100, 200, 300);
            SrvCopychunk chunk2 = new SrvCopychunk(400, 500, 600);

            assertArrayEquals(ASCII_STRING.getBytes(StandardCharsets.US_ASCII), result, "Should produce same bytes as ASCII encoding");
        }
    }

    @Nested
    @DisplayName("OEM Encoding Tests")
    class OEMEncodingTests {

        @Test
        @DisplayName("getOEMBytes should use configuration encoding")
        void testGetOEMBytes() {

	// RestoreOngoing indicates if a restore is in progress
	RestoreOngoing bool

	// A standard MIME type describing the format of the object.
	ContentType string

	// Specifies what content encodings have been applied to the object and thus
	// what decoding mechanisms must be applied to obtain the object referenced
	// by the Content-Type header field.
	ContentEncoding string

    UrlComponentEncodingTester
      .newInstance()
      .nonPrintableAscii(Encoding.FORBIDDEN)
      .nonAscii(Encoding.PUNYCODE)
      .override(
        Encoding.FORBIDDEN,
        '\t'.code,
        '\n'.code,
        '\u000c'.code,
        '\r'.code,
        ' '.code,
      ).override(
        Encoding.FORBIDDEN,
        '#'.code,
        '%'.code,
        '/'.code,
        ':'.code,