Blogger URL Canonicalization

blogger never redirect www to http. by default www is canonical url and it will pass authority to your main link.
 
So does it mean that google won't consider it as a duplicate content?
 
So does it mean that google won't consider it as a duplicate content?

They won't because the www version doesn't exist in the first place. Canonical urls are for root domains and directories under root domains only. They don't apply to subdomains, and your blogger blog is built on a subdomain.
 
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