How to update a lambda function using apache camel?

问题

I hava a camel rest api which is supposed to update my existing function in aws lambda. The code is like so ->

.post("lambda-update-function")
   .route()
   .process(new Processor(){

      @Override
      public void process(Exchange exchange) throws Exception {
      exchange.getIn().setHeader("CamelAwsLambdaS3Bucket", "bucketName");
      exchange.getIn().setHeader("CamelAwsLambdaS3Key", "aws1.zip");
      }
    })
   .to("aws2-lambda://functionName?accessKey=insert&secretKey=insert&region=us-east-1&operation=updateFunction")
   .endRest();

The updated version of the zip file is in a S3 bucket hence I have used those headers. When I hit a request on that route I get an error Exhausted after delivery attempt: 1 caught: software.amazon.awssdk.services.lambda.model.InvalidParameterValueException: Please provide a source for function code. (Service: Lambda, Status Code: 400, Request ID: 39d05e32-a862-41fb-ab12-a6cdf0d5e516, Extended Request ID: null).

来源：https://stackoverflow.com/questions/62985926/how-to-update-a-lambda-function-using-apache-camel