// Test that application/xhtml+xml is correctly matched
        Pattern pattern = Pattern.compile(WEB_FILE_RULE_PATTERN);
        assertTrue(pattern.matcher("application/xhtml+xml").matches());
    }

    @Test
    public void test_webFileRulePattern_rdfXml() {
        // Test that application/rdf+xml is correctly matched
        Pattern pattern = Pattern.compile(WEB_FILE_RULE_PATTERN);

## Pin your `fastapi` version { #pin-your-fastapi-version }

The first thing you should do is to "pin" the version of **FastAPI** you are using to the specific latest version that you know works correctly for your application.

For example, let's say you are using version `0.112.0` in your app.

    # class "feature"
    assert is_uploadfile_sequence_annotation(list[str] | list[UploadFile])


def test_serialize_sequence_value_with_optional_list():
    """Test that serialize_sequence_value handles optional lists correctly."""
    from fastapi._compat import v2

    field_info = FieldInfo(annotation=list[str] | None)
    field = v2.ModelField(name="items", field_info=field_info)

        assertEquals("Multiple deserializations should produce identical results", deserialized1, deserialized2);
    }

    /**
     * Test that ThreadLocal Kryo instances work correctly
     * This verifies that the ThreadLocal implementation doesn't cause issues
     */
    @Test
    public void test_threadLocalKryo() {
        // Perform multiple serializations to ensure ThreadLocal works

You will see the automatic API docs for the sub-application, including only its own _path operations_, all under the correct sub-path prefix `/subapi`:

<img src="/img/tutorial/sub-applications/image02.png">

If you try interacting with any of the two user interfaces, they will work correctly, because the browser will be able to talk to each specific app or sub-app.

### Technical Details: `root_path` { #technical-details-root-path }

        // Wrap it in ServletRuntimeException
        ServletRuntimeException runtimeException = new ServletRuntimeException(servletException);

        // Verify that the cause is correctly set
        assertNotNull(runtimeException);
        assertEquals(servletException, runtimeException.getCause());

        // Verify that the message is preserved from the cause

{* ../../docs_src/advanced_middleware/tutorial001_py310.py hl[2,6] *}

## `TrustedHostMiddleware` { #trustedhostmiddleware }

Enforces that all incoming requests have a correctly set `Host` header, in order to guard against HTTP Host Header attacks.

{* ../../docs_src/advanced_middleware/tutorial002_py310.py hl[2,6:8] *}

The following arguments are supported:

    @Test
    public void test_defaultSettings_emailAddressCorrect() throws Exception {
        // Test that the email typo fix is correct: support@@example.com -> ******@****.***
        Map<String, Object> defaultSettings = createDefaultSettings();

        // Verify email addresses are correctly formatted (no double @)
        String technicalEmail = (String) defaultSettings.get("onelogin.saml2.contacts.technical.email_address");

import com.google.common.io.BaseEncoding;

public class FacetResponseTest extends UnitFessTestCase {

    @Test
    public void test_base64_encoding_decoding() {
        // Test that base64 encoding and decoding works correctly
        String originalString = "test field with spaces";
        String encoded = BaseEncoding.base64().encode(originalString.getBytes(StandardCharsets.UTF_8));

        String svgPatternCorrect = "image/svg\\+xml"; // Correct: \\+ matches literal +

        // Verify wrong pattern does NOT match (demonstrates the bug)
        assertFalse(svgMimetype.matches(svgPatternWrong));

        // Verify correct pattern DOES match (demonstrates the fix)
        assertTrue(svgMimetype.matches(svgPatternCorrect));