Internet Direct (Indy) Version 9.0.1 Beta
TIdHTTP.ProtocolVersion
Specifies the HTTP version.

property ProtocolVersion: TIdHTTPProtocolVersion;
Description
ProtocolVersion is a TIdHTTPProtocolVersion property that specifies the HTTP version used for Get, Head, and Post methods for the HTTP client. ProtocolVersion allows the following values:

The default value for ProtocolVersion is pv1_1.