Keyword Analysis & Research: what does error code 504 mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does error code 504 mean	0.17	0.6	3275	44	29
what	1.12	0.8	5173	49	4
does	0.84	0.6	8133	47	4
error	1.58	0.3	7675	33	5
code	1.86	0.3	9700	68	4
504	1.14	0.2	8900	54	3
mean	0.78	1	3099	41	4

Keyword	CPC	PCC	Volume	Score
what does error code 504 mean	1.65	0.4	8509	87