Internal error when creating AWS::CloudFront::Function

Question

I get:   
  
Resource handler returned message: "null" (RequestToken: bd56596b-531f-6d7a-b65e-832baf8382fd, HandlerErrorCode: InternalFailure)  
  
This is the template:  
  
          WebCFFunction: {  
            Type: 'AWS::CloudFront::Function',  
            Properties: {  
              AutoPublish: true,  
              FunctionCode: (omitted ...),  
              Name: 'web-cf-function',  
            },  
          },  
  
The function can be created manually via the cloudfront console without issue.

Monim · Accepted Answer

Add FunctionConfig property to resolve the error. I had to add this property even though the documentation says it's optional.

vicary · Answer

I encountered this issue even when `FunctionCode` and `FunctionConfig` present. It turns out to be an existing Function created at the previous CloudFormation deployment, when updating via Change Sets, it may cause this error.

Without further error messages, my educated guess is that the internal comparison of the change set returns an empty diff.

Changing the `Name` is our current workaround.

acaird · Answer

I'm seeing the same thing.  What do you have for your `FunctionCode` block?  I have tried `fileb://filename.js` and `filename.js` and the yaml multi line like `FunctionCode: | (lines of javascript)` with the same results.  
  
Edited by: acaird on Sep 1, 2021 8:39 AM

Kevin Sepulveda · Answer

In my case, I got that error message because I already had another cloudfront function with the same name that I was trying to create.

Internal error when creating AWS::CloudFront::Function

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