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https://issues.apache.org/jira/browse/FLEX-35110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15372980#comment-15372980
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Alex Harui commented on FLEX-35110:
-----------------------------------
You would have to contact Adobe support for an official answer. Adobe Flex 3.6
shipped with Adobe Flash Builder 4.7 which is still under support, so you may
get support for Adobe Flex 3.6.
However, FileReference is a Flash API, not a Flex API. A recommended practice
when you are having trouble with Flash APIs in a Flex app is to make an
ActionScript-only (no Flex) test project that tests the Flash API. If you can
make it fail, then you can more easily see if it will fail against the last
Flash version and then you should be able to get support from Adobe.
> Flex based component using FileReference Upload API fails with 400 Bad
> Request for multi upload scenario because of missing boundary conditions
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLEX-35110
> URL: https://issues.apache.org/jira/browse/FLEX-35110
> Project: Apache Flex
> Issue Type: Bug
> Components: RPC: General
> Reporter: Vamshi Krishna Kaley
> Attachments: Multiple SCORM Uploads Troubleshooting with Engg and
> CO.msg
>
>
> We have developed a component of multi file upload using flex sdk 3 using
> FileReference Upload built in functionality.
> However we have encountered that the upload fails for more than two files
> over slow transmission networks.
> On further investigation We found that the flash is resulting in I/O Errors
> during the retrieval of total bytes being uploaded for display in the upload
> progress with the log information as displayed below
> ==============================================
> 388956 AVMINF: MTHD flash.events::ProgressEvent/get bytesLoaded ()
> 388958 AVMINF: MTHD flash.events::ProgressEvent/get bytesTotal ()
> 388960 AVMINF: MTHD flash.events::IOErrorEvent ()
> 388962 AVMINF: MTHD flash.events::ErrorEvent ()
> 388964 AVMINF: MTHD flash.events::TextEvent ()
> 388965 AVMINF: MTHD flash.events::Event ()
> 388967 AVMINF: MTHD flash.events::Event/ctor ()
> 388970 AVMINF: MTHD FileUpload/OnIOError ()
> 388972 AVMINF: MTHD flash.events::IOErrorEvent/toString ()
> IOError Event : Dispatched when the upload or download fails.[IOErrorEvent
> type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2038:
> File I/O Error. URL: <<http based Post URL>>
> =============================================
> Due to this error the POST request is resulting in Bad Requests on the Web
> Server because of the missing boundary closures which are required to
> complete the POST request.
> This issue is always replicable on slow networks which are hovering around
> 100Kbps
> Request you to look into it and do the needful to provide a fix which needs
> to be incorporated as one of our customers are critically affected with this
> functionality miss.
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