Hi Ruslan,

> http header: "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36"
> http header: "Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"
> http header: "Accept-Encoding: gzip, deflate, br"
> http header: "Accept-Language:
ru,en-US;q=0.9,en;q=0.8,zh-TW;q=0.7,zh;q=0.6"
> (...)
> http header: "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36"
> http header: "Accept: image/webp,image/apng,image/*,*/*;q=0.8"
> http header: "Accept-Encoding: gzip, deflate, br"
> http header: "Accept-Language:
ru,en-US;q=0.9,en;q=0.8,zh-TW;q=0.7,zh;q=0.6"

> http header: "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13;
rv:52.0) Gecko/20100101 Firefox/52.0"
> http header: "Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
> http header: "Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3"
> http header: "Accept-Encoding: gzip, deflate"
> (...)
> http header: "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13;
rv:52.0) Gecko/20100101 Firefox/52.0"
> http header: "Accept: */*"
> http header: "Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3"
> http header: "Accept-Encoding: gzip, deflate"

In both examples, User-Agent, Accept-Encoding and Accept-Language are the
same, and Accept is (an extension-specific?) subset of the "/" request,
which proves that this is in fact a good idea.

Best regards,
Piotr Sikora
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