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> The search fails where the accept-language was wrong far dominate the numbers over the search fails where the accept-language was ignored.

Wouldn't this imply that "regular" users are running their OS and/or browser in a language they do not want to use for search? This seems unlikely to me, or is there some systematic reason that results in this being the case?

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Browsers tend to default to an Accept-Language of en-US, and most users do not know how to change it.

As a result, Google learned early on (and numbers continue to suggest it is the case that) an Accept-Language of specifically en-US really means "The user has not chosen a language; fall back to a heuristic."

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