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[downloader/http] Clarify rationale for Content-Range check (#6426)

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Sergey M․ 2015-08-03 02:27:47 +06:00
parent 10eaa8ef1d
commit 84bc4dcb0f
1 changed files with 11 additions and 4 deletions
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11
youtube_dl/downloader/http.py
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@ -58,14 +58,21 @@ class HttpFD(FileDownloader):
# Establish connection
try:
data = self.ydl.urlopen(request)
# When trying to resume, Content-Range HTTP header of response has to be checked
# to match the value of requested Range HTTP header. This is due to a webservers
# that don't support resuming and serve a whole file with no Content-Range
# set in response despite of requested Range (see
# https://github.com/rg3/youtube-dl/issues/6057#issuecomment-126129799)
if resume_len > 0:
content_range = data.headers.get('Content-Range')
if content_range:
content_range_m = re.search(r'bytes (\d+)-', content_range)
# Content-Range is correct - go on
# Content-Range is present and matches requested Range, resume is possible
if content_range_m and resume_len == int(content_range_m.group(1)):
break
# Content-Range is invalid - wipe the file and do entire redownload
# Content-Range is either not present or invalid. Assuming remote webserver is
# trying to send the whole file, resume is not possible, so wiping the local file
# and performing entire redownload
self.report_unable_to_resume()
resume_len = 0
open_mode = 'wb'