[dev_slash_null]

Unfortunately, thats just not true. Accept-Lanuage is set to English most of the time, even for people in non-enlish speaking counties. It's not that they cannot use English, it's that experiments show that users are more likely to interact with content that is in their predicted language, even when Accept-Language is set to English.

[stephenr]

> Accept-Lanuage is set to English most of the time, even for people in non-enlish speaking counties.

Unless you can point to some kind of evidence that shows Accept-Language is set to English regardless of the host OS' language/region setting, there's zero reason to believe this claim.

> It's not that they cannot use English

Right, the entirety of non-english speaking, internet-using humans are able to read English, it's just a bunch of them choose not to, but only when it comes to using a webpage? Is that what you're suggesting?

Edit:

I just did some very quick testing of the theory that browsers will send the "wrong" Accept-Language header.

* Safari on macOS with preferred OS language set to English (Australian) sends `en-AU,en;q=0.9`

* Safari on macOS with preferred OS language set to Thai (and second pref of English) sends `th-TH,th;q=0.9`

* Chrome on macOS with preferred OS language set to English (Australian) for some reason sends `en-GB,en-US;q=0.9,en;q=0.8`

* Chrome on macOS with preferred OS language set to Thai (and second pref of English) sends `th-TH,th;q=0.9`

* Edge on Windows 11 with preferred OS language set to Thai (and second pref of English) sends `th,en;q=0.9,en-GB;q=0.8,en-US;q=0.7`

* Chrome on Windows 11 with preferred OS language set to Thai (and second pref of English) sends `th-TH,th;q=0.9`

Firefox is the one that can get it wrong, sometimes: in the macOS VM, I had already downloaded Firefox before setting the OS language to Thai, and the downloaded versions set a browser preferred language which doesn't change based on the OS language (the default is US English).

But when I downloaded Firefox using Edge in the Win11 VM, the language was already set to Thai, so I got a "Thai preferred" download link when I typed "Firefox" in the search bar, and thus the language string it sends is not surprising: `th,en-US;q=0.7,en;q=0.3`

So, again: without some evidence to show that somehow people who have no understanding of English, are using their computers or phones or tablets in English, I'm calling bullshit on this repeated claim that "non english user's browsers send requests for English language content".

[dev_slash_null]

Let me clarify what I'm claiming here.

In many counties, users have their OS/Browser settings set to English only, when they actually also speak other languages (or in certain countries, exclusively other languages). There's also a bunch of complexity in regards to spoken/written language comprehension, but I won't get into that here.

There is much more engagement when Google presents content in languages people actually know (or, rather, languages Google thinks they know), regardless of what their Accept-Language header is.

Unfortunately, I cannot present you with hard stats, as I no longer work there. I'm sorry that's unsatisfactory, and I'm not asking you to blindly trust the word of a stranger. Just wanted to offer up some insight into why the system behaves as it does sometimes.

[Flimm]

I've seen quite a few people with my own eyes use devices with an English interface (or French) without knowing much English (or French). Some of them are illiterate. This is quite common in some parts of the world. These people find use in their English devices, because websites like YouTube provide content in their language even when the interface is not in their language.

Sometimes these people cannot switch the interface language of the operating system. For example٫ Windows Single Language edition forbids changing the language of the interface, and it is common in developing countries.