部署的KrakenD-Django微服务无法接收JSON请求体数据

问题现象 #

所有端点状态正常，但POST请求提交的JSON数据无法传递到Django服务，本地环境运行正常，仅部署实例存在该问题。

请求示例 #

curl --location 'https://backend-dev-url.com/api/v1' \
--header 'Content-Type: application/json' \
--data '{
    "a":"value",
    "b":"value"
}'

收到的响应 #

{
      
    "a": [
        "This field is required."
    ],
    "b": [
        "This field is required."
    ]
  
}

当前KrakenD配置片段 #

{
      "endpoint": "api/v1",
      "method": "POST",
      "output_encoding": "no-op",
      "backend": [
        {
          "url_pattern": "api/v1",
          "encoding": "no-op",
          "sd": "static",
          "method": "POST",
          "host": ["http://localhost:8000"],
          "disable_host_sanitize": false
        }
      ],
      "input_headers": ["Authorization","Content-Type"],
      "extra_config": {
        "qos/ratelimit/router": {
          "max_rate": 100,
          "client_max_rate": 60,
          "every": "1m",
          "strategy": "ip"
        }
      }
    }

解决方案 #

问题源于KrakenD默认不会自动转发原始请求体，需显式配置开启该功能。修改配置如下：

1. 在端点层级添加"input_body": "raw"，指定网关直接转发原始请求体
2. 保留后端的"encoding": "no-op"，避免对请求体进行额外转换

修改后的配置片段：

{
      "endpoint": "api/v1",
      "method": "POST",
      "output_encoding": "no-op",
      "input_body": "raw",
      "backend": [
        {
          "url_pattern": "api/v1",
          "encoding": "no-op",
          "sd": "static",
          "method": "POST",
          "host": ["http://localhost:8000"],
          "disable_host_sanitize": false
        }
      ],
      "input_headers": ["Authorization","Content-Type"],
      "extra_config": {
        "qos/ratelimit/router": {
          "max_rate": 100,
          "client_max_rate": 60,
          "every": "1m",
          "strategy": "ip"
        }
      }
    }

原因说明：KrakenD默认会对请求做聚合或格式转换，未配置input_body: raw时，不会将客户端提交的原始JSON请求体转发给Django后端，导致Django无法获取数据，触发字段必填的校验错误。本地环境因为直接访问Django服务，未经过网关转发，所以功能正常。

内容的提问来源于stack exchange，提问作者Geo Joseph