PHP header HTTP 1.0 vs 1.1 [duplicate]

This question already has answers here: Closed 11 years ago.

Possibl开发者_Python百科e Duplicate:

404 header - HTTP 1.0 or 1.1?

Should you use

header( "HTTP/1.0 404 Not Found", true, 404 );

instead of

header( "HTTP/1.1 404 Not Found", true, 404 );

when the user agent uses HTTP/1.0? That is, is it good to reply with the same HTTP version?

Btw, I'm using it to claim that a page doesn't exist to users currently not logged in. I understand that it is different versions and that HTTP/1.1 has different functions.

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When the user agent says it uses HTTP 1.0 (specified in RFC 1945 dated May 1996) you should not assume that it understands a protocol that was developed later (like HTTP 1.1 specified in RFC 2616 dated June 1999). So use HTTP 1.0 in the reply.

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If you don't want to distinguish between 1.0 and 1.1 and want to send a static header, I guess

header( "HTTP/1.0 404 Not Found", true, 404 );

is the safe way to do it - every client speaks HTTP/1.0.

But I also expect that no client at all checks the http version in case of a 404. At least, I never experienced problems with the http version...