Do crawlers send HTTP

A

Alexander Sadovnikov2015-01-06 18:48:30

Search engines

Alexander Sadovnikov, 2015-01-06 18:48:30

Do crawlers send HTTP_HOST header?

There is a variable in the title of the site pages, the value of which depends on HTTP_HOST, but there is no value for this variable in the search results, from which I concluded that they still do not send. But how do you know for sure?

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SagePtr, 2015-01-06
@sad0vnikov

They do, otherwise how do they index sites on shared hosting?