On Fri, 22 Aug 2014, Robert Xiao wrote:
cURL may erroneously produce this error:
curl: (33) HTTP server doesn't seem to support byte ranges. Cannot resume.
when asked to continue downloading a file that is already completed. This
happens with servers that do not send Content-Range headers when replying
with the HTTP 416 error ("Requested Range Not Satisfiable"), even if the
server ordinarily supports Content-Range. In particular, when attempting to
continue a completed download, cURL will request a byte range past the end
of the file, which triggers a 416 error.
Not a comment on the issue but a further observation: Some caches,
e.g. Varnish, will send a 200 and the entire object in response to
a completely unsatisfyable Range: request rather than a 416. Resuming
with a one-byte overlap with the existing content can help avoid this
unnecessary download.
--
Monty Brandenberg, Software Engineer MCB, Inc.
[email protected] P.O. Box 425292
[email protected] Cambridge, MA 02142-0006
617.864.6907
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