AWS CloudFormation Error: TemplateURL must be a supported URL

Problem

當我要執行以下 CloudFormation yaml file:

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Resources" : {
        "myStack" : {
	       "Type" : "AWS::CloudFormation::Stack",
	       "Properties" : {
              "TemplateURL" : "https://s3.amazonaws.com/nested-demo-531193295833/s3static.json",
              "TimeoutInMinutes" : "60"
	       }
        },
        "myStack2" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
               "TemplateURL" : "https://s3.amazonaws.com/nested-demo-531193295833/noretain.json",
               "TimeoutInMinutes" : "60"
            }
         }    
    }
}

出現以下錯誤

Root Cause

因為 TemplateURL 輸入有誤，故出現上述錯誤

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Resources" : {
        "myStack" : {
	       "Type" : "AWS::CloudFormation::Stack",
	       "Properties" : {
              "TemplateURL" : "https://s3.amazonaws.com/nested-demo-531193295833/s3static.json",
              "TimeoutInMinutes" : "60"
	       }
        },
        "myStack2" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
               "TemplateURL" : "https://s3.amazonaws.com/nested-demo-531193295833/noretain.json",
               "TimeoutInMinutes" : "60"
            }
         }    
    }
}

How-To

重新修正 YAML 內容中的 TemplateURL，即可成功執行

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Resources" : {
        "myStack" : {
	       "Type" : "AWS::CloudFormation::Stack",
	       "Properties" : {
              "TemplateURL" : "https://nested-demo-531193295833.s3.amazonaws.com/s3static.json",
              "TimeoutInMinutes" : "60"
	       }
        },
        "myStack2" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
               "TemplateURL" : "https://nested-demo-531193295833.s3.amazonaws.com/noretain.json",
               "TimeoutInMinutes" : "60"
            }
         }    
    }
}

執行結果