E então você também leu como lidar com [CORS com o `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

Nesta seção, veremos como usar outros middlewares.

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

- `kube-apiserver` added:

}

func TestLRUEdgeCases(t *testing.T) {
	lc := lru.NewLRU[string, *string](2, nil, 0)

	// Adding a nil value
	lc.Add("key1", nil)

	value, exists := lc.Get("key1")
	if value != nil || !exists {
		t.Fatalf("unexpected value or existence flag for key1: value=%v, exists=%v", value, exists)
	}

	// Adding an entry with the same key but different value
	newVal := "val1"
	lc.Add("key1", &newVal)

                if (!urlValue.startsWith("#") && protocolHelper.isValidWebProtocol(urlValue)) {
                    final String u = duplicateHostHelper.convert(urlValue);
                    crawler.addUrl(u);
                    if (logger.isInfoEnabled()) {
                        logger.info("Target URL: {}", u);
                    }
                }
            }));

            // set included urls

            } else {
                UniAddress addr;
                try {
                    addr = getAddress();
                } catch (final UnknownHostException uhe) {
                    throw new SmbException(url.toString(), uhe);
                }
                if (addr.getAddress() instanceof NbtAddress) {
                    final int code = ((NbtAddress) addr.getAddress()).getNameType();

        DurableHandleReconnect reconnectCtx = new DurableHandleReconnect(info.getFileId());

        // This would typically involve:
        // 1. Creating a new Smb2CreateRequest with reconnect context
        // 2. Adding lease context if needed
        // 3. Sending the request through the appropriate transport
        // 4. Processing the response

        // For now, we'll return false to indicate that the concrete implementation

        ubiquity](https://github.com/google/guava/wiki/PhilosophyExplained#utility-times-ubiquity).


        #### Utility: compare with alternatives


        There is always *some* alternative to adding a new feature to Guava, even if it's just
        forking Guava yourself.


        We want to see that new features have some significant advantage over the alternatives.
        These advantages can take

* Path `prefix`: `/items`.
* `tags`: (just one tag: `items`).
* Extra `responses`.
* `dependencies`: they all need that `X-Token` dependency we created.

So, instead of adding all that to each *path operation*, we can add it to the `APIRouter`.

{* ../../docs_src/bigger_applications/app_an_py39/routers/items.py hl[5:10,16,21] title["app/routers/items.py"] *}

                popularWordsRequestBuilder.setSeed(baseSeed);
                stream(baseTags).of(stream -> stream.forEach(tag -> popularWordsRequestBuilder.addTag(tag)));
                stream(baseRoles).of(stream -> stream.forEach(role -> popularWordsRequestBuilder.addRole(role)));

import org.jspecify.annotations.Nullable;

/**
 * A {@code SetMultimap} whose set of values for a given key are kept sorted; that is, they comprise
 * a {@link SortedSet}. It cannot hold duplicate key-value pairs; adding a key-value pair that's
 * already in the multimap has no effect. This interface does not specify the ordering of the
 * multimap's keys. See the {@link Multimap} documentation for information common to all multimaps.
 *