# Advanced Middleware { #advanced-middleware }

In the main tutorial you read how to add [Custom Middleware](../tutorial/middleware.md) to your application.

And then you also read how to handle [CORS with the `CORSMiddleware`](../tutorial/cors.md).

In this section we'll see how to use other middlewares.

## Adding ASGI middlewares { #adding-asgi-middlewares }

    @Test
    @DisplayName("TestLocking fields can be configured")
    void testFieldConfiguration() {
        TestLocking t = new TestLocking();

        // Set custom values
        t.numThreads = 5;
        t.numIter = 10;
        t.delay = 250L;
        t.url = "smb://custom/path/file.txt";

        // Verify values are set
        assertEquals(5, t.numThreads, "numThreads should be configurable");

    /**
     * Test for unwrap() method with matching type.
     * Verifies that unwrap returns the correct instance when the type matches.
     */
    @Test
    void testUnwrap_withMatchingType() {
        // Create a custom SmbTree type for testing
        CustomSmbTree customTree = mock(CustomSmbTree.class);
        when(smbTree.unwrap(CustomSmbTree.class)).thenReturn(customTree);

        CustomSmbTree result = smbTree.unwrap(CustomSmbTree.class);

	return madmin.TraceInfo{
		TraceType: madmin.TraceStorage,
		Time:      startTime,
		NodeName:  globalLocalNodeName,
		FuncName:  "storage." + s.String(),
		Duration:  duration,
		Bytes:     size,
		Path:      path,
		Error:     err,
		Custom:    custom,
	}
}

      "number_of_shards": 1,
      "number_of_replicas": 0,
      "auto_expand_replicas": "0-1"
    },
    "analysis": {
      "analyzer": {
        "standard_analyzer": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "cjk_width",
            "asciifolding",
            "lowercase",
            "stop",
            "stemmer"
          ]
        }

# Environment file
packaging.env.file=/etc/sysconfig/fess

# Default configuration directory and file to use in bin/plugin script

# Simple marker to check that properties are correctly overridden
packaging.type=rpm

# Custom header for package scripts
packaging.scripts.header=

@app.get("/items/{item_id}")
async def read_item(item_id: str):
    if item_id not in items:
        raise HTTPException(
            status_code=404,
            detail="Item not found",
            headers={"X-Error": "Some custom header"},
        )
    return {"item": items[item_id]}


@app.get("/http-no-body-statuscode-exception")
async def no_body_status_code_exception():
    raise HTTPException(status_code=204)

}

// RegisterDecompressor allows custom decompressors for a specified method ID.
// The common methods [Store] and [Deflate] are built in.
func RegisterDecompressor(method uint16, dcomp Decompressor) {
	if _, dup := decompressors.LoadOrStore(method, dcomp); dup {
		panic("decompressor already registered")
	}
}

// RegisterCompressor registers custom compressors for a specified method ID.

# Properties used to build to the DEB package
#

# Environment file
packaging.env.file=/etc/default/fess

# Simple marker to check that properties are correctly overridden
packaging.type=deb

# Custom header for package scripts
packaging.scripts.header=#!/bin/sh${line.separator}set -e

 * Internationalized Domain Names (IDN).
 * It converts Unicode domain names to ASCII Compatible Encoding (ACE) using the
 * {@link java.net.IDN} class.
 *
 * <p>This class allows setting a custom flag for the IDN conversion and a custom
 * encoding for URL decoding.</p>
 *
 * <p>Example usage:</p>
 * <pre>
 * {@code
 * Hc5IdnDnsResolver resolver = new Hc5IdnDnsResolver();
 * resolver.setFlag(IDN.ALLOW_UNASSIGNED);