[jira] [Commented] (CB-1518) FileTransfer.download progress events has this.lengthComputable = false when response is gzipped on iOS

["Ian Clelland (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CB-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13609406#comment-13609406 ] 

Ian Clelland commented on CB-1518:
----------------------------------

I've implemented a solution to this (#2 from above) -- if a download returns an OK status, but the bytesExpected comes back as {{NSURLResponseUnknownLength}}, then it starts a parallel HEAD request to the origin server for the same resource. If that returns with a Content-Length header, then the original delegate's bytesExpected is updated, and a progress event is sent immediately.
                
> FileTransfer.download progress events has this.lengthComputable = false when response is gzipped on iOS
> -------------------------------------------------------------------------------------------------------
>
>                 Key: CB-1518
>                 URL: https://issues.apache.org/jira/browse/CB-1518
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: iOS
>    Affects Versions: 2.2.0
>            Reporter: Andrew Grieve
>            Assignee: Ian Clelland
>            Priority: Minor
>             Fix For: 2.6.0
>
>
> As far as I can tell, there is no way to track the actual bytes downloaded except for changing network stacks to something like ASI's. 
> Lame other option #1:
> Re-gzip the response locally to approximate.
> Lame other option #2:
> Send a second request HEAD request without accept-encoding header (while the first request is in progress), and that will tell us the expected non-compressed length. This option is actually reasonable I think.

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