headers - allowed_http_origins() only works in theme functions.php

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The following code works in my theme's functions.php file but not in my plugin's main/entry file:

/** Allow cross origin resource access
 */
function add_cors_http_header(){
  header("Access-Control-Allow-Origin: *");
}
add_action('init','add_cors_http_header');

If put into the main plugin file I see this:

Access to XMLHttpRequest at 'http://localhost/
wptest2/wp-admin/admin-ajax.php' 
from origin 'http://localhost:8080' 
has been blocked by CORS policy: 
No 'Access-Control-Allow-Origin' header 
is present on the requested resource.

I need to setup CORS using my plugin files only so users won't have to make custom mods, is there any way to accomplish this?

Also tried in the plugin entry file (and failed):

function add_allowed_origins(array $origins = []) {
  $origins[] = 'http://localhost:8080';
  return $origins;
}
add_filter('allowed_http_origins', 'add_allowed_origins');

.

function add_cors_http_header() {
  header("Access-Control-Allow-Origin: *");
}
add_action('send_headers', 'add_cors_http_header');

The following code works in my theme's functions.php file but not in my plugin's main/entry file:

/** Allow cross origin resource access
 */
function add_cors_http_header(){
  header("Access-Control-Allow-Origin: *");
}
add_action('init','add_cors_http_header');

If put into the main plugin file I see this:

Access to XMLHttpRequest at 'http://localhost/
wptest2/wp-admin/admin-ajax.php' 
from origin 'http://localhost:8080' 
has been blocked by CORS policy: 
No 'Access-Control-Allow-Origin' header 
is present on the requested resource.

I need to setup CORS using my plugin files only so users won't have to make custom mods, is there any way to accomplish this?

Also tried in the plugin entry file (and failed):

function add_allowed_origins(array $origins = []) {
  $origins[] = 'http://localhost:8080';
  return $origins;
}
add_filter('allowed_http_origins', 'add_allowed_origins');

.

function add_cors_http_header() {
  header("Access-Control-Allow-Origin: *");
}
add_action('send_headers', 'add_cors_http_header');

• headers

Share Improve this question edited Jul 12, 2019 at 21:22 Sean D asked Jul 12, 2019 at 20:29 Sean DSean D 38788 silver badges2121 bronze badges

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1 Answer 1

Sorted by: Reset to default 1

Try using send_headers action hook instead of init. It should work.

add_action( 'send_headers', 'add_cors_http_header' );

function add_cors_http_header()
{
    header("Access-Control-Allow-Origin: *");
}

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