# 响应 - 更改状态码

你可能之前已经了解到，你可以设置默认的[响应状态码](../tutorial/response-status-code.md){.internal-link target=_blank}。

但在某些情况下，你需要返回一个不同于默认值的状态码。

## 使用场景

例如，假设你想默认返回一个HTTP状态码为“OK”`200`。

但如果数据不存在，你想创建它，并返回一个HTTP状态码为“CREATED”`201`。

但你仍然希望能够使用`response_model`过滤和转换你返回的数据。

对于这些情况，你可以使用一个`Response`参数。

## 使用 `Response` 参数

你可以在你的*路径操作函数*中声明一个`Response`类型的参数（就像你可以为cookies和头部做的那样）。

然后你可以在这个*临时*响应对象中设置`status_code`。

	if existing == nil {
		existing = &k8sv1.GatewayClassStatus{}
	}
	existing.Conditions = kstatus.UpdateConditionIfChanged(existing.Conditions, metav1.Condition{
		Type:               string(k8sv1.GatewayClassConditionStatusAccepted),
		Status:             kstatus.StatusTrue,
		ObservedGeneration: gen,
		LastTransitionTime: metav1.Now(),

	ResourceClaimStatuses      []PodResourceClaimStatusApplyConfiguration `json:"resourceClaimStatuses,omitempty"`
}

// PodStatusApplyConfiguration constructs an declarative configuration of the PodStatus type for use with
// apply.
func PodStatus() *PodStatusApplyConfiguration {
	return &PodStatusApplyConfiguration{}
}

// WithPhase sets the Phase field in the declarative configuration to the given value

	ev   Event
	proc *proc
}

type gStatus int

type gState struct {
	seq    uint64
	status gStatus
}

const (
	gDead gStatus = iota
	gRunnable
	gRunning
	gWaiting

	unordered = ^uint64(0)
	garbage   = ^uint64(0) - 1
	noseq     = ^uint64(0)
	seqinc    = ^uint64(0) - 1
)

// stateTransition returns goroutine state (sequence and status) when the event

	tv_nsec int64
}

//go:nosplit
func (ts *timespec) setNsec(ns int64) {
	ts.tv_sec = ns / 1e9
	ts.tv_nsec = ns % 1e9
}

type fpcontrol struct {
	pad_cgo_0 [2]byte
}

type fpstatus struct {
	pad_cgo_0 [2]byte
}

type regmmst struct {
	mmst_reg  [10]int8
	mmst_rsrv [6]int8
}

type regxmm struct {
	xmm_reg [16]int8
}

type regs64 struct {
	rax    uint64

	stats.GCSys = memstats.gcMiscSys.load() + gcWorkBufInUse + gcProgPtrScalarBitsInUse
	stats.OtherSys = memstats.other_sys.load()
	stats.NextGC = heapGoal
	stats.LastGC = memstats.last_gc_unix
	stats.PauseTotalNs = memstats.pause_total_ns
	stats.PauseNs = memstats.pause_ns
	stats.PauseEnd = memstats.pause_end
	stats.NumGC = memstats.numgc
	stats.NumForcedGC = memstats.numforcedgc

    reason: Programmed
    status: "True"
    type: Programmed
  listeners:
  - attachedRoutes: 1
    conditions:
    - lastTransitionTime: fake
      message: No errors found
      reason: Accepted
      status: "True"
      type: Accepted
    - lastTransitionTime: fake
      message: No errors found
      reason: NoConflicts
      status: "False"
      type: Conflicted

    reason: Programmed
    status: "True"
    type: Programmed
  listeners:
  - attachedRoutes: 1
    conditions:
    - lastTransitionTime: fake
      message: No errors found
      reason: Accepted
      status: "True"
      type: Accepted
    - lastTransitionTime: fake
      message: No errors found
      reason: NoConflicts
      status: "False"
      type: Conflicted

      status: "True"
      type: Accepted
    - lastTransitionTime: fake
      message: No errors found
      reason: NoConflicts
      status: "False"
      type: Conflicted
    - lastTransitionTime: fake
      message: No errors found
      reason: Programmed
      status: "True"
      type: Programmed
    - lastTransitionTime: fake
      message: No errors found
      reason: ResolvedRefs
      status: "True"

Esses códigos de status têm um nome associado para reconhecê-los, mas o importante é o número.

Resumidamente:


* `100` e acima são para "Informações". Você raramente os usa diretamente. As respostas com esses códigos de status não podem ter um corpo.
* **`200`** e acima são para respostas "Bem-sucedidas". Estes são os que você mais usaria.