I want to avoid sending request with OPTION http method. With below configuration Kendo sending two requests, first with OPTION method that sending nothing and right after with POST method with file data.
Options http request is a common issue that is observed by all cross origin requests and is not specific for Kendo Upload. You can refer to this forum thread where more information about it is provided and possible ways to disable it are added. In Kendo Upload you can use the upload event to add custom headers as it is described here at the bottom of the page.
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