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curl

    1: Long: fail
    2: Short: f
    3: Protocols: HTTP
    4: Help: Fail silently (no output at all) on HTTP errors
    5: ---
    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.
   11: 
   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).