如何修复MongoDB Data API误报“缺少Content-Type头部”的问题

在使用Deluge脚本通过MongoDB Data API向MongoDB Atlas插入文档时，明明已经在请求头中指定了Content-Type: application/json，却持续收到错误：

Header missing: please add content-type: application/json or application/ejson to specify payload data types

原错误代码 #

// POST to MongoDB Data API 
headers = Map();
headers.put("Content-Type", "application/json");
headers.put("api-key", "API-KEY");
headers.put("Access-Control-Request-Headers", "*");

data = Map();
data.put("dataSource", "cluster");
data.put("database", "database");
data.put("collection", "names");

document = Map();
document.put("full_name", "Ari Adar");
data.put("document", document);

response = invokeurl
[
    url: "https://ap-southeast-2.aws.data.mongodb-api.com/app/data-***/endpoint/data/v1/action/insertOne"
    type: POST
    parameters: data.toString()
    headers: headers
];

alert response;

问题分析 #

调试后发现，MongoDB Data API的错误提示并不准确——问题并非请求头缺失，而是传入invokeurl的参数没有正确以JSON字符串形式传递。原代码中直接在parameters字段使用data.toString()，因Deluge语法特性导致实际传递的格式不符合API要求。

修复后代码 #

// POST to MongoDB Data API 
headers = Map();
headers.put("Content-Type", "application/json");
headers.put("api-key", "API-KEY");
headers.put("Access-Control-Request-Headers", "*");

data = Map();
data.put("dataSource", "cluster");
data.put("database", "database");
data.put("collection", "names");

document = Map();
document.put("full_name", "Ari Adar");
data.put("document", document);

// Stringify the data map 
data_string = data.toString();

response = invokeurl
[
    url: "https://ap-southeast-2.aws.data.mongodb-api.com/app/data-***/endpoint/data/v1/action/insertOne"
    type: POST
    parameters: data_string
    headers: headers
];

alert response;

修复说明 #

将数据Map先赋值给变量data_string，再传入invokeurl的parameters字段，确保传递的是标准JSON字符串，符合MongoDB Data API的接收要求。

内容的提问来源于stack exchange，提问作者Ari Adar