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A CORS-safelisted request header is one of the following HTTP headers:
When containing only these headers (and values that meet the additional requirements laid out below), a requests doesn't need to send a preflight request in the context of CORS.
You can safelist more headers using the
header and also list the above headers there to circumvent the following additional restrictions:Access-Control-Allow-Headers
Additional restrictions
CORS-safelisted headers must also fulfill the following requirements in order to be a CORS-safelisted request header:
Accept-Language
and Content-Language
: can only have values consisting of 0-9
, A-Z
, a-z
, space or *,-.;=
.Accept
and Content-Type
: can't contain a CORS-unsafe request header byte: "():<>?@[\]{}
, Delete, Tab and control characters: 0x00 to 0x19.Content-Type
: needs to have a MIME type of its parsed value (ignoring parameters) of either application/x-www-form-urlencoded
, multipart/form-data
, or text/plain
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