We are trying to deploy a SAP UI5 (JS framework) based application (Contains HTML, JS and CSS files like regular web application) on one of the IIS servers in customer landscape.

This app to fetch a list information from one of the share point backend systems by using ajax GET request.But we are always ending up with

'Response for preflight has invalid HTTP status code 401' Error.

Please help us here.

2 Answers 2


for some one coming here and not finding the answer, under custom header of http protocol

add name="Access-Control-Allow-Origin" value="*" /> add name="Access-Control-Allow-Methods" value="GET,PUT,POST,DELETE,OPTIONS"/> add name="Access-Control-Allow-Headers" value="Content-Type" />


401 error is related to access issue. Make sure the account has valid permission to read the SharePoint library. and the same account has access to your preflight thing.

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