How to set custom headers in PHP

JAVA developer send me data in headers. I take it this way

$_SESSION["HTTP_COUNTRYNAME"];

How to make response back with headers? It tried header("countryname: USA"); but php function headers_li开发者_运维技巧st doesn't show it.

header('countryname: USA');
print_r(headers_list());

Array ( [0] => X-Powered-By: PHP/5.3.0 [1] => countryname: USA ) 

...works for me.

Are you sure you haven't output anything before it? You cannot set headers after you've started printing text. Use headers_sent() to see if the headers have already been sent (that is, if you've already output something).

in server file add header("Access-Control-Allow-Headers: custom_header_name"); in request for example AJAX add add custom_header_name and value for example

$.ajax({ url:your_url_to_server, method:'POST', data:dat, headers:{ "token_name":"19980", }, dataType:'json', success:(data)=>{ console.log(data) } })

then at server side you can access the value of the header by using $_SERVER['HTTP_CUSTOM_HEADER_NAME']; i hope this also works for you...