The HTTP X-Content-Type-Options
response header indicates that the MIME types advertised in the Content-Type
headers should be respected and not changed. The header allows you to avoid MIME type sniffing by specifying that the MIME types are deliberately configured.
Site security testers usually expect this header to be set.
Note: The X-Content-Type-Options
header only apply request-blocking due to nosniff
for request destinations of "script"
and "style"
. However, it also enables Cross-Origin Read Blocking (CORB) protection for HTML, TXT, JSON and XML files (excluding SVG image/svg+xml
).
X-Content-Type-Options: nosniff
Directives
nosniff
Blocks a request if the request destination is of type style
and the MIME type is not text/css
, or of type script
and the MIME type is not a JavaScript MIME type.
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