What is the difference between header and headers in http?

what is the difference between header and headers? If it"s the same thing, why coexist?

Mar.15,2021

1.Headers is the core of HTTP requests and corresponding requests, and it carries information about client browsers, request pages, servers, and so on.
2.header messages are usually divided into four parts,: general header, request header, response header, entity header. However, as far as understanding is concerned, the sensory boundary is not very clear.


is just a singular and plural number, there is no difference.


the problem needs to be more specific.


I think the header you are talking about may correspond to body, that is, the header of a request or response, that is, multiple lines of text separated by CRLF. The part that follows
header after two consecutive CRLF, is body,. Usually GET has no body.
as for headers, that means multiple lines of text in the header paragraph.

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