Read more about them in the [FastAPI docs for Middleware](https://fastapi.tiangolo.com/advanced/middleware/).

::: fastapi.middleware.cors.CORSMiddleware

It can be imported from `fastapi`:

```python
from fastapi.middleware.cors import CORSMiddleware
```

::: fastapi.middleware.gzip.GZipMiddleware

It can be imported from `fastapi`:

```python

## 自定义头部

请注意，可以使用'X-'前缀添加自定义专有头部。

1. Return prevResult

## Troubleshooting

### Collecting Logs

#### Using `istioctl`/helm

- Set: `values.global.logging.level="cni:debug,ambient:debug"`
- Inspect the pod logs of a `istio-cni` Daemonset pod on a specific node.

#### From a specific node syslog

The CNI plugins are executed by threads in the `kubelet` process.  The CNI plugins logs end up the syslog

const val individualPerformanceTestArtifactRules = """
testing/*/build/test-results-*.zip => results
testing/*/build/tmp/**/log.txt => failure-logs
testing/*/build/tmp/**/profile.log => failure-logs
testing/*/build/tmp/**/daemon-*.out.log => failure-logs
"""

// to avoid pathname too long error
fun BuildSteps.substDirOnWindows(os: Os) {
    if (os == Os.WINDOWS) {
        script {

      apply {
        assertThat(index, "No more messages found")
          .isLessThan(logs.size)
        assertThat(logs[index++])
          .matches(Regex(prefix.pattern + regex.pattern, RegexOption.DOT_MATCHES_ALL))
      }

    fun assertNoMoreLogs() {
      assertThat(logs.size, "More messages remain: ${logs.subList(index, logs.size)}")
        .isEqualTo(index)
    }

    override fun log(message: String) {

    var level = Level.NONE

    enum class Level {
      /** No logs. */
      NONE,

      /**
       * Logs request and response lines.
       *
       * Example:
       * ```
       * --> POST /greeting http/1.1 (3-byte body)
       *
       * <-- 200 OK (22ms, 6-byte body)
       * ```
       */
      BASIC,

      /**
       * Logs request and response lines and their respective headers.
       *

Mientras esperas y hablas con esa persona 😍, de vez en cuando, verificas el número del mostrador para ver si ya es tu turno.

Al final, en algún momento, llega tu turno. Vas al mostrador, coges tus hamburguesas 🍔 y vuelves a la mesa.

<img src="https://fastapi.tiangolo.com/img/async/concurrent-burgers/concurrent-burgers-06.png" alt="illustration">

		}
		r = &audit.Entry{
			Version:      internalAudit.Version,
			DeploymentID: xhttp.GlobalDeploymentID,
			Time:         time.Now().UTC(),
		}
		return r
	}
	return nil
}

// AuditLog - logs audit logs to all audit targets.
func AuditLog(ctx context.Context, w http.ResponseWriter, r *http.Request, reqClaims map[string]interface{}, filterKeys ...string) {
	auditTgts := AuditTargets()
	if len(auditTgts) == 0 {
		return
	}

// Returns logOnceType
func newLogOnceType() *logOnceType {
	l := &logOnceType{IDMap: make(map[string]onceErr)}
	go l.cleanupRoutine()
	return l
}

var logOnce = newLogOnceType()

// LogOnceIf - Logs notification errors - once per error.
// id is a unique identifier for related log messages, refer to cmd/notification.go
// on how it is used.

    // Confirm a single ping was sent and received, and its reply was sent and received.
    val logs = testLogHandler.takeAll()
    assertThat(countFrames(logs, "FINE: >> 0x00000000     8 PING          "))
      .isEqualTo(1)
    assertThat(countFrames(logs, "FINE: << 0x00000000     8 PING          "))
      .isEqualTo(1)
    assertThat(countFrames(logs, "FINE: >> 0x00000000     8 PING          ACK"))
      .isEqualTo(1)