Lot of http/1.1 connections from Server Main IP

1-0	18721	0/1/1	_	0.44	100	4	8	0.0	0.01	0.01	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.41	100	21	672	0.0	0.01	0.01	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.44	100	348	354	0.0	0.12	0.12	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.46	100	284	1797	0.0	0.04	0.04	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.42	100	17	1245	0.0	0.04	0.04	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.44	100	6	814	0.0	0.10	0.10	Server Main IP	http/1.1
1-0	18721	0/1/1	_	0.31	100	225	451	0.0	0.01	0.01	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.42	100	5	443	0.0	0.01	0.01	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.18	100	586	1174	0.0	0.03	0.03	Server Main IP	http/1.1
1-0	18721	0/2/2	_	0.44	100	1	2210	0.0	0.03	0.03	Server Main IP	http/1.1

I had checked the cloudflare Security page it shows the server is under attack Top Threat type : Bad browser How to block such attacks by CSF