Use `@` before a file name with cURL data flags

Using the -d flag with the curl command in your terminal is cool, but using curl <endpoint> -d @<file-name> is cooler.

The @ syntax allows you to pass a file as the data, and it works for the other --data-<type> commands, like --data-binary and --data-urlencode.

If you want to pass an @ in the data without this special interpretation, you can use --data-raw.

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