totalBytesExpectedToWrite always -1. Why ?

[KrLikeblue]

Hello,

Your library is very useful but I am facing one issue.

I have audio files on my server and I am not calling any API and directly giving path of my audio files to download using your library. Now when download starts in below function, I get totalBytesExpectedToWrite = -1 always. My audio files are around 1MB. It is strange and I am not able to solve it. Can you please help me ? one other thing I noticed is that when I download image, then it is giving me perfect totalBytesExpectedToWrite. but not for audio. In below function, I am getting totalBytesExpectedToWrite = -1.

• (void)URLSession:(NSURLSession *)session
  downloadTask:(NSURLSessionDownloadTask *)downloadTask
  didWriteData:(int64_t)bytesWritten
  totalBytesWritten:(int64_t)totalBytesWritten
  totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite

Thanks,
Patel

[MrChens]

@KrLikeblue because the service which you download from is not support the expectedfilesize。
can you use curl to test? like this curl -I "the url of you downloadfile" --header "Range: bytes=0-"

[KiranJasvanee]

I've received below data, where I can check there is content-range is available. How can I get it?
HTTP/1.1 206 Partial Content
Server: nginx/1.4.0
Date: Fri, 24 Feb 2017 09:12:07 GMT
Content-Type: video/mp4
Connection: keep-alive
Display: staticcontent_sol
Expires: Sun, 26 Mar 2017 09:12:07 UTC
Response: 206
Vary: Origin,Accept-Encoding,X-APP-JSON
X-Middleton-Display: staticcontent_sol
X-Middleton-Response: 206
Set-Cookie: ezouid_6183=948056624; Path=/; Domain=sample-videos.com; Expires=Thu, 14 Feb 2019 09:12:07 UTC
Set-Cookie: lp_6183=http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4; Path=/; Domain=sample-videos.com; Expires=Fri, 24 Feb 2017 11:12:07 UTC
Set-Cookie: ezoadgid_6183=16; Path=/; Domain=sample-videos.com; Expires=Fri, 24 Feb 2017 09:42:07 UTC
Set-Cookie: active_template::6183=%2Farticle%2Ftwo_column_no_inner_ad; Path=/; Domain=sample-videos.com; Expires=Sun, 26 Feb 2017 09:12:07 UTC
Set-Cookie: ezoab_6183=mod4-; Path=/; Domain=sample-videos.com; Expires=Fri, 24 Feb 2017 09:42:07 UTC
Content-Range: bytes 0-1055735/1055736
Etag: "34168e-101bf8-5357ce5f7ea80"
Last-Modified: Sat, 18 Feb 2017 20:29:48 GMT
Cache-Control: public, max-age=2592000