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Check partial request support with Accept-Ranges

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cnnrmnn 2021-05-13 12:11:34 -04:00
parent b9b917756c
commit df0915e33f
1 changed files with 9 additions and 10 deletions
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19
Library/Homebrew/utils/curl.rb
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@ -130,23 +130,22 @@ module Utils
destination.dirname.mkpath
if try_partial
range_stdout = curl_output("--location", "--range", "0-1",
"--dump-header", "-",
"--write-out", "%\{http_code}",
range_stdout = curl_output("--location", "--dump-header", "-",
"--head", *args, **options).stdout
headers, _, http_status = range_stdout.partition("\r\n\r\n")
headers = parse_headers(range_stdout.split("\r\n\r\n").first)
supports_partial_download = http_status.to_i == 206 # Partial Content
if supports_partial_download &&
# Any value for `accept-ranges` other than none indicates that the server supports range requests.
# Its absence indicates no support.
supports_partial = headers["accept-ranges"] && headers["accept-ranges"] != "none"
if supports_partial &&
destination.exist? &&
destination.size == %r{^.*Content-Range: bytes \d+-\d+/(\d+)\r\n.*$}m.match(headers)&.[](1)&.to_i
destination.size == headers["content-length"].to_i
return # We've already downloaded all the bytes
end
else
supports_partial_download = false
end
continue_at = if destination.exist? && supports_partial_download
continue_at = if destination.exist? && supports_partial
"-"
else
0