!!! warning "Aviso"
    Antes de definir `convert_underscores` como `False`, lembre-se de que alguns proxies e servidores HTTP não permitem o uso de cabeçalhos com sublinhados.

## Cabeçalhos duplicados

É possível receber cabeçalhos duplicados. Isso significa, o mesmo cabeçalho com vários valores.

Você pode definir esses casos usando uma lista na declaração de tipo.

Você receberá todos os valores do cabeçalho duplicado como uma `list` Python.

        /*
         * Grab plugin executions that are bound to the selected lifecycle phases from project. The effective model of
         * the project already contains the plugin executions induced by the project's packaging type. Remember, all
         * phases of interest and only those are in the lifecycle mapping, if a phase has no value in the map, we are
         * not interested in any of the executions bound to it.
         */

	if u, ok := obj.(*uidSet); ok {
		return u.key, nil
	}
	return "", fmt.Errorf("could not find key for obj %#v", obj)
}

// uidSet holds a key and a set of UIDs. Used by the
// uidTrackingExpectations to remember which UID it has seen/still waiting for.
type uidSet struct {
	sync.RWMutex
	set sets.Set[string]
	key string
}

// uidTrackingExpectations tracks the UIDs of Pods the controller is waiting to

						isNested = true
						break
					}
				}
				if isNested {
					continue // skip -- double nested beneath myMountPoint
				}
				// since this mount point is nested, remember it so that we can check that following ones aren't nested beneath this one
				prevNestedMPs = append(prevNestedMPs, mp+string(os.PathSeparator))
				retval = append(retval, mp[len(myMPSlash):])
			}
		}
		return nil
	}

loop` when integrating asynchronous function calls in your tests (e.g. when using <a href="https://stackoverflow.com/questions/41584243/runtimeerror-task-attached-to-a-different-loop" class="external-link" target="_blank">MongoDB's MotorClient</a>) Remember to instantiate objects that need an event loop only within async functions, e.g. an `'@app.on_event("startup")` callback....

 *   directories inside them.
 * - At the end of the build
 *   - stop watching the watchable directories with nothing to watch inside
 *   - remember the currently watched directories as old watched directories for the next build
 *   - remove everything that isn't watched from the virtual file system.
 */

	servicePorts := map[uint32]bool{}
	portMapping := map[uint32]uint32{} // svc port -> svc targetPort mapping
	gwSelectorMatches := 0

	// For pods selected by gw.Selector, find Services that select them and remember those ports
	gwSelector := klabels.SelectorFromSet(gw.Selector)
	c.ForEach(gvk.Pod, func(rPod *resource.Instance) bool {
		podLabels := klabels.Set(rPod.Metadata.Labels)
		if gwSelector.Matches(podLabels) {

		if addr1 == addr2 {
			return true
		}

		// ... or already seen
		typ := v1.Type()
		v := visit{addr1, addr2, typ}
		if visited[v] {
			return true
		}

		// Remember for later.
		visited[v] = true
	}

	switch v1.Kind() {
	case reflect.Array:
		// We don't need to check length here because length is part of
		// an array's type, which has already been filtered for.

    ```

!!! note "Technical Details"
    `Header` is a "sister" class of `Path`, `Query` and `Cookie`. It also inherits from the same common `Param` class.

    But remember that when you import `Query`, `Path`, `Header`, and others from `fastapi`, those are actually functions that return special classes.

!!! info

	if err != nil {
		fmt.Fprintf(os.Stderr, "Error from decryption: %s\n", err)
		return
	}

	fmt.Printf("Plaintext: %s\n", plaintext)

	// Remember that encryption only provides confidentiality. The
	// ciphertext should be signed before authenticity is assumed and, even
	// then, consider that messages might be reordered.