Gets the additional data fields that could be submitted while uploading the file. It returns dictionary which has as a key - the name of the submitted data field and as a value - the value of the data field If the browser supports HTML5 file API - like latest versions of Chrome, Mozilla FF, IE - data fields(like username) are added to the FormData object which is sent to the server via XMLHttpRequest object If the browser does NOT support HTML5 file API - like older versions of IE - IE10 and earlier - then these values are added as hidden fields to the form(that contains uploading file and is submitted to the server) These fields are inside the header of the http request
Property Value
The additional data fields.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
