a header like this
HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: close\r\nRefresh: yyy\r\nContent-Length: xxx\r\n\r\n
where yyy = refresh rate in seconds and xxx is the number of bytes in your page (the header not included) is a good thing

The AT+CIPCLOSE,NN is no required when you do this , although multiconnections are even more problematic a single user connection is more robust

ps this is a header not a <heading>