逻辑应用无法从Parse JSON操作中找到vlaue

Question

我有一个逻辑应用，该应用由HTTP调用触发。伴随此调用的是一组标头，其中大多数标头用于不同的switch语句中。通过使用解析JSON操作，我从请求中输入了标头，它们成功地进行了解析（图像1），但是对于其中一个标头（searchType），switch语句由于某种原因而评估为null（图像2）。  我无法为自己的生活弄清楚原因。

我试图从头开始重新制作逻辑应用程序，将其完全复制到另一个环境，并尝试使用表达式访问解析后的值，而不是动态内容。当我尝试该表达式时，会被告知它是无效的表达式（图3）。该表达式是代码视图中使用的表达式的直接副本。

关于我该如何解决这个问题的任何建议？

Successful parsing of headers

parsed header evaluates to null

expression invalid

JSON复制逻辑应用程序

{
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "HeadersJson": {
                "inputs": {
                    "content": "@triggerOutputs()['headers']",
                    "schema": {
                        "properties": {
                            "APICallFor": {
                                "type": "string"
                            },
                            "Accept-Encoding": {
                                "type": "string"
                            },
                            "Accept-Language": {
                                "type": "string"
                            },
                            "Connection": {
                                "type": "string"
                            },
                            "Content-Length": {
                                "type": "string"
                            },
                            "Content-Type": {
                                "type": "string"
                            },
                            "Host": {
                                "type": "string"
                            },
                            "User-Agent": {
                                "type": "string"
                            },
                            "searchType": {
                                "type": "string"
                            },
                            "x-ms-action-tracking-id": {
                                "type": "string"
                            },
                            "x-ms-activity-vector": {
                                "type": "string"
                            },
                            "x-ms-client-request-id": {
                                "type": "string"
                            },
                            "x-ms-client-tracking-id": {
                                "type": "string"
                            },
                            "x-ms-correlation-id": {
                                "type": "string"
                            },
                            "x-ms-execution-location": {
                                "type": "string"
                            },
                            "x-ms-tracking-id": {
                                "type": "string"
                            },
                            "x-ms-workflow-id": {
                                "type": "string"
                            },
                            "x-ms-workflow-name": {
                                "type": "string"
                            },
                            "x-ms-workflow-operation-name": {
                                "type": "string"
                            },
                            "x-ms-workflow-resourcegroup-name": {
                                "type": "string"
                            },
                            "x-ms-workflow-run-id": {
                                "type": "string"
                            },
                            "x-ms-workflow-run-tracking-id": {
                                "type": "string"
                            },
                            "x-ms-workflow-subscription-id": {
                                "type": "string"
                            },
                            "x-ms-workflow-system-id": {
                                "type": "string"
                            },
                            "x-ms-workflow-version": {
                                "type": "string"
                            }
                        },
                        "type": "object"
                    }
                },
                "runAfter": {},
                "type": "ParseJson"
            },
            "Switch": {
                "cases": {
                    "Get_Departments": {
                        "actions": {
                            "Switch_3": {
                                "cases": {
                                    "Case": {
                                        "actions": {
                                            "Response_5": {
                                                "inputs": {
                                                    "body": "got to individual",
                                                    "statusCode": 200
                                                },
                                                "kind": "Http",
                                                "runAfter": {},
                                                "type": "Response"
                                            }
                                        },
                                        "case": "individual"
                                    },
                                    "Case_2": {
                                        "actions": {
                                            "Response": {
                                                "inputs": {
                                                    "body": "got to bulk",
                                                    "statusCode": 200
                                                },
                                                "kind": "Http",
                                                "runAfter": {},
                                                "type": "Response"
                                            }
                                        },
                                        "case": "bulk"
                                    }
                                },
                                "default": {
                                    "actions": {
                                        "Response_3": {
                                            "inputs": {
                                                "body": "the searchType parameter is not valid",
                                                "statusCode": 200
                                            },
                                            "kind": "Http",
                                            "runAfter": {},
                                            "type": "Response"
                                        }
                                    }
                                },
                                "expression": "@body('HeadersJson')?['serachType']",
                                "runAfter": {},
                                "type": "Switch"
                            }
                        },
                        "case": "departments"
                    }
                },
                "default": {
                    "actions": {
                        "Response_2": {
                            "inputs": {
                                "body": "the APICallFor header is not valid",
                                "statusCode": 500
                            },
                            "kind": "Http",
                            "runAfter": {},
                            "type": "Response"
                        }
                    }
                },
                "expression": "@body('HeadersJson')?['APICallFor']",
                "runAfter": {
                    "HeadersJson": [
                        "Succeeded"
                    ]
                },
                "type": "Switch"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {},
        "triggers": {
            "manual": {
                "inputs": {
                    "schema": {
                        "properties": {
                            "searchString": {
                                "type": "string"
                            },
                            "searchType": {
                                "type": "string"
                            }
                        },
                        "type": "object"
                    }
                },
                "kind": "Http",
                "operationOptions": "EnableSchemaValidation",
                "type": "Request"
            }
        }
    }
}

Answer 1

您的表达式无效是因为您的表达式中的this.Subscription = combineLatest([a,b]) .pipe( map( (...) ) ).subscribe( (...) ); （在代码视图中使用了@表达式，它应该只是@。

关于您的body('HeadersJson')?['searchType']为空，可能是searchType模式不正确，因此请确保正确的模式为doc way。

如果要使用标头数据，则不需要将标头解析为json，因为数据已经是json格式，但是如果将数据传递给请求主体，则需要对其进行解析。我也已经对其进行了测试，它将与ParseJson一起使用，因此只需将其粘贴到表达式中，如果使用代码视图，它将为triggerOutputs()['headers']['searchType']。