The first line of the last server response.
property StatusLine: String read get_StatusLine;
This property contains the first line of the last server response. This value can be used for diagnostic purposes. If an HTTP error is returned when calling a method of the component, the error string is the same as the StatusLine property.
The HTTP protocol specifies the structure of the StatusLine as: [HTTP version] [Result Code] [Description].
This property is read-only and not available at design time.