computer networks – What is the meaning of this error message I get when downloading documents?

Every so often I’ll hop on my laptop, open google, and eventually try to download and open some document, only for the document to wind up looking like this:
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What on earth does all this mean? What language is it, and why does it pop up instead of normally formatted English?

Also, if it isn’t already obvious, I have zero technical experience with software and have no idea what sort of jargon I would use to even ask this question properly. Please keep in mind that I’m just a schlub who wants to know what this means.