Hi：
I find an issue about http. I don't use chunked, so s->chunksize will
be set as UINT64_MAX when http open, but because of "if (s->chunksize > 0)
s->chunksize -= len;" then chunksize will not be UINT64_MAX.
If ffurl_read return to 0, s->off < target_end, http_buf_read will
return to 0, then this will lead to eof, so this is incorrect, and
http_buf_read should return to AVERROR(EIO).
the bug reproduce step：
1. An exception occurred in the CDN edge server, that will lead to close
the http connection.
2. Because http is disconnected, so ffurl_read will return 0
3. Avformat will consider I/O is eof
4. Right now http is actually disconnect abnormally, it should return to
ERROR, rather than return to EOF.
this problem was caused by commit: 2a05c8f813de6f2278827734bf8102291e7484aa
0001-libavformat-http-return-EIO-when-ffurl_read-return-0.patch
Description: Binary data
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