Curl-url-file-3a-2f-2f-2f __exclusive__ -

: Explicitly restrict the protocols your application accepts. Force the scheme to match only https:// .

Understanding this keyword requires fluency in three interconnected security concepts: curl-url-file-3A-2F-2F-2F

curl runs with the permissions of the user executing the command. Ensure the user has read access to the target file. : Explicitly restrict the protocols your application accepts

While curl is famous for HTTP and HTTPS requests , it also supports the FILE scheme. Using file:/// allows you to treat local files as if they were remote resources. : curl file:///path/to/your/file.txt Ensure the user has read access to the target file

, which is the standard URI scheme for accessing local files on a computer. Common Use Cases for curl file:///

curl "file:///tmp/../../../etc/passwd"

That string is a slightly mangled version of a local file request often used in programming or security contexts. The "proper story" behind it involves and the curl command-line tool. Breaking Down the Code