Bypass WordPress' unsafe URL check for CRM connection

wpf-allow-unsafe-crm-urls.php

<?php 
/**
 *
 * This sometimes fixes the error "A valid URL was not provided." wen connecting to self
 * hosted CRMs like Mautic, FluentCRM, or FunnelKit.
 *
 * @param array  $args HTTP request arguments.
 * @param string $url  The request URL.
 * @return array HTTP request arguments.
 */
function allow_insecure_urls( $args, $url ) {

	if ( function_exists( 'wp_fusion' ) && false !== strpos( $url, wp_fusion()->crm->url ) ) {
		$args['reject_unsafe_urls'] = false;
	}

	return $args;

}

add_filter( 'http_request_args', 'allow_insecure_urls', 100, 2 );

// Sometimes this works as well

add_filter( 'http_request_host_is_external', '__return_true' );