How to add IE EDGE header to all pages (including wp-login)

We need to add `<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">` to our sites as IE11 is defaulting to an older version.

I think this article but the second element in regard to the wp-login page doesn't work…

  • Adam Czajczyk
    • Support Gorilla

    Hello uol

    I hope you’re well today and thank you for your question!

    I have tested the code from the article and it seems to be sending proper headers on my end. I understand that the first part – for the front-end – is working fine for you as well, just the “wp-login.php” part is not, right?

    Can you tell me please where/how did you add that second part of the code?

    Also, try removing “conditionals” from the code (just for testing) so instead of these three lines

    if ( 'wp-login.php' === $GLOBALS['pagenow'] && ! headers_sent() && isset($_SERVER['HTTP_USER_AGENT']) && (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) ) {
    header( 'X-UA-Compatible: IE=edge,chrome=1' );

    try just

    header( 'X-UA-Compatible: IE=edge,chrome=1' );

    while rest of the code is the same.

    Let me know about both code placement and if the changed code works, please.

    Kind regards,


  • uol
    • Design Lord, Child of Thor

    I’ve tried inluding it in a plugin and get the following notice/error for the second part of the code, for the wp-login side of things

    Notice: Undefined index: pagenow in C:inetpubwwwrootuatwp-contentpluginsie-compatibility-viewie-compatibility-view.php on line 64

    Also is there a way to check if its sending the headers within IE?

  • Adam Czajczyk
    • Support Gorilla

    Hello uol

    Thanks for your reply.

    The notice suggests that this might be related to the settings of "globals" – in PHP globals can be (and often are) disabled and in that case that entire (if…. conditional statement) would be omitted.

    IN this case, try following what I suggested before – removing entire "if…" statement (see my previous post).

    As for checking headers in IE. Yes, that's doable. In Internet Explorer 11 you can do it like this:

    – hit F12 once the page is load (it will open browser console)

    – switch to "Network" tab in browser console

    – there should be a "content type" option so use it to make sure that "Documents" is selected

    – on a list the 1st or 2nd position should point (see the URL) to the loaded page (it will probably be something like just "/" or with some attributes like "?redirect_to=":wink:

    – click on it and you should see headers in the panel on the right

    I've attached a screenshot for you but please note that it's in Polish (unfortunately, I cannot switch language in IE11 (unlike in Chrome or Firefox) as it takes language settings from the OS – so consider it please a visual indication of what you should see rather than a detailed "visual guide" (it's an example on msn site but the rule is the same).

    Best regards,


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