Internet Direct (Indy) Version 9.0.2 Beta
TIdHTTP.Host
Specifies the name or address of the server accessed by an HTTP request.

property Host;
Description
Host is a String property that specifies the Internet address or host name of the server accessed by an HTTP Request for a specified URL. Host is included in the HTTP Request as a header field for HTTP 1.1 Requests. Host may also refer to the name or address of a Proxy server when Proxy Connections are used to access the resource identified in URL. The exact resource identified by an HTTP request is determined by examining both the URL and the Host properties.