112. Use the self-developed proxy server to solve the cross domain access error encountered when uploading files by SAP ui5 fileuploader

We have spent three steps in this tutorial , It introduces SAP UI5 FileUploader How to use , Realization principle , And the root cause of cross domain access errors .

• SAP UI5 Application development tutorial 109 - Use SAP UI5 FileUploader Control to upload local files

• SAP UI5 Application development tutorial 110 - SAP UI5 FileUploader Control in-depth introduction - Why need a hidden iframe

• SAP UI5 Application development tutorial 111 - SAP UI5 FileUploader Control to upload local files , Cross domain access error encountered when receiving the response from the server

Let's review again the root cause of this cross domain access error ：

(1) We developed SAP UI5 application , towards XML In the view ,FileUploader The control of uploadUrl Hard coded localhost:3003 Initiate file upload request , As shown in the figure below 1.

(2) Monitor in 3003 File server on port ( On the right side of the picture below ), Received this upload request , Return the response to SAP UI5 Hidden created by frame iframe Of body Go to the node ( The details are in the previous steps