Keyword Analysis & Research: what does http 400 error mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does http 400 error mean	1.29	0.9	1367	16	29
what	0.53	0.1	7330	39	4
does	1.73	0.5	3582	14	4
http	1.53	0.6	207	55	4
400	1.23	0.3	5911	58	3
error	1.2	0.2	1172	63	5
mean	1.73	0.1	1415	42	4

Keyword	CPC	PCC	Volume	Score
what does http 400 error mean	0.65	0.8	1645	81