mHeaders.Append("\r\n");
mHeaders.AppendLiteral("\r\n");
nsMIMEInputStream::AddHeader(const char *aName, const char *aValue){    NS_ENSURE_FALSE(mStartedReading, NS_ERROR_FAILURE);    mHeaders.Append(aName);    mHeaders.Append(": ");    mHeaders.Append(aValue);    mHeaders.Append("\r\n");    // Just in case someone somehow uses our stream, lets at least    // let the stream have a valid pointer. The stream will be properly    // initialized in nsMIMEInputStream::InitStreams    mHeaderStream->ShareData(mHeaders.get(), 0);    return NS_OK;}