function get_rest_url( $blog_id = null, $path = '/', $scheme = 'rest' ) {
if ( empty( $path ) ) {
$path = '/';
}
$path = '/' . ltrim( $path, '/' );
if ( is_multisite() && get_blog_option( $blog_id, 'permalink_structure' ) || get_option( 'permalink_structure' ) ) {
global $wp_rewrite;
if ( $wp_rewrite->using_index_permalinks() ) {
$url = get_home_url( $blog_id, $wp_rewrite->index . '/' . rest_get_url_prefix(), $scheme );
} else {
$url = get_home_url( $blog_id, rest_get_url_prefix(), $scheme );
}
$url .= $path;
} else {
$url = trailingslashit( get_home_url( $blog_id, '', $scheme ) );
/*
* nginx only allows HTTP/1.0 methods when redirecting from / to /index.php.
* To work around this, we manually add index.php to the URL, avoiding the redirect.
*/
if ( ! str_ends_with( $url, 'index.php' ) ) {
$url .= 'index.php';
}
$url = add_query_arg( 'rest_route', $path, $url );
}
if ( is_ssl() && isset( $_SERVER['SERVER_NAME'] ) ) {
// If the current host is the same as the REST URL host, force the REST URL scheme to HTTPS.
if ( parse_url( get_home_url( $blog_id ), PHP_URL_HOST ) === $_SERVER['SERVER_NAME'] ) {
$url = set_url_scheme( $url, 'https' );
}
}
if ( is_admin() && force_ssl_admin() ) {
/*
* In this situation the home URL may be http:, and `is_ssl()` may be false,
* but the admin is served over https: (one way or another), so REST API usage
* will be blocked by browsers unless it is also served over HTTPS.
*/
$url = set_url_scheme( $url, 'https' );
}
/**
* Filters the REST URL.
*
* Use this filter to adjust the url returned by the get_rest_url() function.
*
* @since 4.4.0
*
* @param string $url REST URL.
* @param string $path REST route.
* @param int|null $blog_id Blog ID.
* @param string $scheme Sanitization scheme.
*/
return apply_filters( 'rest_url', $url, $path, $blog_id, $scheme );
}