Missing custom headers on CloudFront update

[9b]

Update to the CloudFront Origins is missing a CustomHeader that will cause issues. The key is required, but no data needs to be filled in. You can add the following line to 475 to make it work properly:

'CustomHeaders': {u'Quantity': 0}

References: https://github.com/ubergeek42/lambda-letsencrypt/blob/master/lambda_function.py#L469-L474

[ov3rk1ll]

On a similar note: 'QueryStringCacheKeys': {'Quantity': 0} is needed in the ForwardedValues in line 493.

https://github.com/ubergeek42/lambda-letsencrypt/blob/master/lambda_function.py#L493-L496

[tomari]

I've already posted a pull request for this, but that hasn't been merged for some time now: #24