I have a problem when I tried to import products with a CSV. The loading gif stay spinning and nothing happens. The page don´t show any error. I first thought that could be permissions problem, but I changed all permissions to 777 and the error persists.
Now in Chrome Console and Firebug, I see the next error:
Refused to display 'http://[site]/admin/admin/import/validate/key/bda6ac49ba7066862dd8fe30ca58ded2bffa852bd62c2e7cd43c6971dcf2bcaf/?form_key=xarU1fpOx0MQZPfT' in a frame because it set multiple 'X-Frame-Options' headers with conflicting values ('DENY, SAMEORIGIN'). Falling back to 'deny'. POST http://[site]/admin/admin/import/validate/key/bda6ac49ba7066862dd8fe30ca58ded2bffa852bd62c2e7cd43c6971dcf2bcaf/?form_key=xarU1fpOx0MQZPfT net::ERR_BLOCKED_BY_RESPONSE
In some pages said that it could be by the x-frame-options value defined in app/etc/env.php. My current value is SAMEORIGIN:
'x-frame-options' => 'SAMEORIGIN',
What value it must be?
EDIT 1: ADDITIONAL INFORMATION Reviewing the headers of the request of my site, I saw that in every page, nos only Admin, the header X-Frame-Options is duplicated with different values:
What could make this happens?