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curl

    1: Long: retry
    2: Arg: <num>
    3: Added: 7.12.3
    4: Help: Retry request if transient problems occur
    5: ---
    6: If a transient error is returned when curl tries to perform a transfer, it
    7: will retry this number of times before giving up. Setting the number to 0
    8: makes curl do no retries (which is the default). Transient error means either:
    9: a timeout, an FTP 4xx response code or an HTTP 408 or 5xx response code.
   10: 
   11: When curl is about to retry a transfer, it will first wait one second and then
   12: for all forthcoming retries it will double the waiting time until it reaches
   13: 10 minutes which then will be the delay between the rest of the retries.  By
   14: using --retry-delay you disable this exponential backoff algorithm. See also
   15: --retry-max-time to limit the total time allowed for retries.
   16: 
   17: Since curl 7.66.0, curl will comply with the Retry-After: response header if
   18: one was present to know when to issue the next retry.
   19: 
   20: If this option is used several times, the last one will be used.