HTTP Head method Content-Length does not match with size on "View Page info" -

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Please forgive my understanding of this topic. I had a bunch of URL that I want to know the size of my web page. Therefore, I used the HTTP head-rick method to get content-length I created content lengths (I've used Firefox by opening some of those URLs in a browser) and see "Page Info "(Right-click on the website in the browser) option which is" Size: ".

For most of the URLs, both values ​​match but not for anything. I wonder why that is?


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