The original address: https://www.cnblogs.com/findumars/p/5929783.html
To be in this can't go any farther, the original can not download the demo,
If not uIdSSLOpenSSLHeaders. The Load then//Load the SSL library
The begin
Application. The MessageBox (' loading SSL dynamic library failed! 'and' wrong ', MB_ICONEXCLAMATION + MB_TOPMOST);
The Halt;
end;
IdSslLoadErrorStrings;
IdSslAddSslAlgorithms;//the load all SSL algorithm

MethClient:=IdSslMethodClientV23;