4 Help: Fail silently (no output at all) on HTTP errors
6 Fail silently (no output at all) on server errors. This is mostly done to
7 better enable scripts etc to better deal with failed attempts. In normal cases
8 when an HTTP server fails to deliver a document, it returns an HTML document
9 stating so (which often also describes why and more). This flag will prevent
10 curl from outputting that and return error 22.
12 This method is not fail-safe and there are occasions where non-successful
13 response codes will slip through, especially when authentication is involved
14 (response codes 401 and 407).