Indicates that headers have been written in the HTTP response.
property HeaderHasBeenWritten: Boolean;
HeaderHasBeenWritten is a Boolean property that indicates headers have already been written in the HTTP response.
HeaderHasBeenWritten is used in WriteHeader to prevent duplication of header values for the HTTP response. HeaderHasBeenWritten is also checked when a session for a client connection needs to write a HTTP response in the TIdHTTPServer.OnExecute event handler.
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