.Net Core 6 + AWS Lambda 无法处理请求正文中的 base64 数据

问：

我使用 VS 2022 发布到 lambda 工具将 .net core 最小 API 发布到 lambda。API 接受需要上传到 S3 的图像的 base64 字符串。问题是当我从 Postman 调用请求时，lambda 失败并出现 （504） 网关超时错误。如果参数为空，则终结点工作正常。这是我在文件中的 lambda 托管。photoProgram.cs

builder.Services.AddAWSLambdaHosting(LambdaEventSource.RestApi);

来自 Postman 的请求正文

{
    "photo": "/9j/4AAQSkZ.....",
    "ext": "png"
}

文件内容server.template

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Transform": "AWS::Serverless-2016-10-31",
  "Description": "An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
  "Parameters": {},
  "Conditions": {},
  "Resources": {
    "AspNetCoreFunction": {
      "Type": "AWS::Serverless::Function",
      "Properties": {
        "Handler": "xxx",
        "Runtime": "dotnet6",
        "CodeUri": "",
        "MemorySize": 256,
        "Timeout": 30,
        "Role": null,
        "Policies": [
          "AWSLambda_FullAccess",
          "AWSLambdaVPCAccessExecutionRole"
        ],
        "Events": {
          "ProxyResource": {
            "Type": "Api",
            "Properties": {
              "Path": "/{proxy+}",
              "Method": "ANY"
            }
          },
          "RootResource": {
            "Type": "Api",
            "Properties": {
              "Path": "/",
              "Method": "ANY"
            }
          }
        }
      }
    }
  },
  "Outputs": {
    "ApiURL": {
      "Description": "API endpoint URL for Prod environment",
      "Value": {
        "Fn::Sub": "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/"
      }
    }
  }
}

的内容。aws-lambda-tools-defaults.json

{
    "Information" : [
        "...."
    ],
    "profile"     : "default",
    "region"      : "ap-southeast-1",
    "configuration" : "Release",
    "s3-prefix"     : "xxx/",
    "template"      : "serverless.template",
    "template-parameters" : "",
    "s3-bucket"           : "xxx",
    "stack-name"          : "xxx"
}