More download attempt are not managed? with CURLOpen error case "FillBuffer - Failed"/"Open failed with code 0"

[CastagnaIT]

This is a borderline case which happens a few times when servers are unstable due to too many connections from users
can happen that Curl fail the HTTP request

Line 5188

2021-01-02 21:26:39.950 T:2616    DEBUG : AddOnLog: inputstream.adaptive: Download https://ipv4-c040-mil001-ix.1.oca.nflxvideo.net/?o=AQNI2phcDnT2ANJfO7Th_NEcq69y5_xxBt_ygw1itRgy2xx83hbbCqrcyYzUU3-fBwlCu7UTQo13hfiST3SPxpMEg5ey5yjPba4VfYH6IoHeSCdM6DG8rOJMwmIKCY-5xbvKha_7-Q2OsDk44hIzRgwpw2yqBOUuP_oVU38&v=5&e=1609661985&t=2iZXRUua7pmCGRX9ijz2S8AITQ0 finished, avg speed: 3637019.45byte/s, current speed: 3663700.00byte/s
2021-01-02 21:26:40.078 T:9952    ERROR : CCurlFile::FillBuffer - Failed: Couldn't resolve host name(6)
2021-01-02 21:26:40.078 T:9952    ERROR : CCurlFile::Open failed with code 0 for https://ipv4-c040-mil001-ix.1.oca.nflxvideo.net/?o=AQNI2phcDnT2ANJfObLl-9Mdrqtx5_xxBsjygw1itRgy2xx83hbbCqrcyYzUU3-fBwlCu7UTQo13hfiST3SPxpMEg5ey5yjPba4VfYH6IoHeSCdM6DG8rOJMwmIKCY-5xbvKhav09Q2OsDk44hIzRgwpw2yqBOUuP_oVU38&v=5&e=1609661985&t=6e0vpK0idQCu7bUw0I9AQteZfAY:

LOG: kodi.log

What is happened:

• The Curl has failed, in my case the audio stream
  
  CCurlFile::FillBuffer - Failed: Couldn't resolve host name(6)
  CCurlFile::Open failed with code 0 for...
• ISA does not make any attempt to retry downloading therefore the download of the audio stream is blocked
• Then Kodi say stream stalled and automatically try seek forward (very ugly...) but ISA is not more able to download the stalled stream and the sound is broken

I suspect that this is also the same cause of the problems when rarely video playback freezes and kodi stop brutal mode the playback

is it possible to manage at least 2 or 3 download attempts when an error occurs before breaking a stream and then the playback?

[glennguy]

fixed in #594