Make Customizer and REST API Work with development server


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Due to reverse proxy nature of browser-sync, some things like WordPress Customizer and REST API may not behave correctly when opened from the proxy URL.

This happens during development time only and has no side-effect on your production server.

To fix it, add the following snippet in wp-content/mu-plugins/wpackio-fix.php of your local development server.

add_action( 'rest_api_init', function() {
	remove_filter( 'rest_pre_serve_request', 'rest_send_cors_headers' );
	add_filter( 'rest_pre_serve_request', function( $value ) {
		header( 'Access-Control-Allow-Origin: *' );
		header( 'Access-Control-Allow-Methods: GET' );
		header( 'Access-Control-Allow-Credentials: true' );
		header( 'Access-Control-Expose-Headers: Link', false );
		header( 'Access-Control-Allow-Headers: X-Requested-With' );
		return $value;
	} );
}, 15 );
add_action( 'customize_preview_init', function() {
	add_filter( 'wp_headers', function( $headers ) {
		$headers['Content-Security-Policy'] .= '';
		return $headers;
	} );
} );

This is for your development server only. DO NOT add it to your production server.

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