WriteHeader is a procedure used to write the items in AHeader to the connection using the common format for RFC headers in an RFC-compliant message. 

AHeader is a TIdStrings instance containing items in NAME=VALUE format. WriteHeader will translate each line in AHeader to the RFC-compliant header format NAME: VALUE. 

WriteHeader calls the WriteLn method in IOHandler to send the values on the connection to the peer. WriteHeader also sends a single blank line after all values in AHeaders to indicate the end of RFC message headers. 

Use WriteRFCStrings to write the contents of a TStrings instance that follows the rules for RFC message bodies. 

Any blank lines in AHeader are also sent to the peer connection, and could interfere with RFC-compliant protocols where blank lines in RFC headers are used to indicate the end of header values.

WriteRFCStrings 

IOHandler