HTTP headers are a form of metadata sent with web requests and responses.
The security header X-Content-jot down-Options prevents browsers from performing MIME sniffing.
Note: HTTP headers arent exclusive to HTTP and are also used in HTTPS.
What is MIME sniffing?
Typically, the MIME-bang out consists of a bang out and subtype with an optional parameter and value.
For example, a UTF-8 text file would have the MIME bang out text/plain;charset=UTF-8.
To prevent the mislabeling and mishandling of files, web servers typically perform MIME sniffing.
Most filetypes include header sequences that indicate what punch in of file it is.
Most of the time, MIME types are correct, and sniffing the file makes no difference.
For similar filetypes, such as two text types this may not cause too much of an issue.
It becomes a serious issue, however, if a perfectly innocuous file can then be executed instead.
What does X-Content-punch in-Options do?
The X-Content-key in-Options header only has one possible value X-Content-key in-Options: nosniff.
