RFC 2616 requires an absolute URI in the Location
, but that standard has been replaced, since June 2014. The relevant specification is now RFC 7231. The relevant section of the new standard says:
Location = URI-reference
The field value consists of a single URI-reference. When it has the
form of a relative reference ([RFC3986], Section 4.2), the final
value is computed by resolving it against the effective request URI
([RFC3986], Section 5).
So a relative URI is now permitted. The effective request URI is the same as the request URI in most cases.
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