curl로 받은 파일 크기가 0일 때

curl -O로 받았는데 파일 크기가 0인 경우가 있는데 보통은 30x redirect인 경우 입니다. (cdn 또는 trailing slash 등)

 

-L, --location

(HTTP) If the server reports that the requested page has moved to a different location (indicated with a Location: header and a 3XX response code), this option will make curl redo the request on the new place. If used together with -i, --include or -I, --head, headers from all requested pages will be shown. When authentication is used, curl only sends its credentials to the initial host. If a redirect takes curl to a different host, it will not be able to intercept the user+password. See also --location-trusted on how to change this. You can limit the amount of redirects to follow by using the --max-redirs option.

When curl follows a redirect and if the request is a POST, it will send the following request with a GET if the HTTP response was 301, 302, or 303. If the response code was any other 3xx code, curl will re-send the following request using the same unmodified method.

You can tell curl to not change POST requests to GET after a 30x response by using the dedicated options for that: --post301, --post302 and --post303.

The method set with -X, --request overrides the method curl would otherwise select to use.

Providing -L, --location multiple times has no extra effect. Disable it again with --no-location.

Example:

 curl -L https://example.com
See also --resolve and --alt-svc.

참고: https://curl.se/docs/manpage.html

curl에 L(location) option을 붙이면 30x response가 왔을 때 다시 요청합니다.

즉 curl -LO {url} 형식으로 쓰면 됩니다

 

Reference

- https://askubuntu.com/questions/1036484/curl-o-stores-an-empty-file-though-wget-works-well