There were three problems I discovered with my code above.
First, $_SERVER["HTTP_REFERRER"];
is an undefined index, moreover it is mispelled – HTTP_REFERER
would be correct if it could be accessed this way in WP. I found get_http_origin()
instead.
$data['UrlReferer'] = get_http_origin();
Second, I also mispelled the field I was saving this variable to – UrlReferrer
(bad), UrlReferer
(correct), something only I could have detected by testing on my end. But I wouldn’t have caught this if I didn’t catch the first.
Third, I dropped $data['ClientBrowser'] = $_SERVER["HTTP_USER_AGENT"];
since I can get that client side.
UPDATE
I can also get the URL referrer from the client side as well, by passing window.location.href
to the api.
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