WordPress at a glance
action is not described

http_api_debug action-hook . WP 2.8.0

Fires after an HTTP API response is received and before the response is returned.

Usage

add_action( 'http_api_debug', 'action_function_name_6471', 10, 5 );
function action_function_name_6471( $response, $context, $class, $r, $url ){
	// action...
}
$response(array/WP_Error)
HTTP response or WP_Error object.
$context(string)
Context under which the hook is fired.
$class(string)
HTTP transport used.
$r(array)
HTTP request arguments.
$url(string)
The request URL.

Where the hook is called

WP_Http::request()
WP_Http::_dispatch_request()
wp-includes/class-http.php 396
do_action( 'http_api_debug', $response, 'response', 'Requests', $r, $url );
wp-includes/class-http.php 558
do_action( 'http_api_debug', $response, 'response', $class, $args, $url );

Where the hook is used (in WP core)

Does not used.