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Sitecore Headless Error: Parse Error: Unexpected whitespace after header value

 The Problem

This can occur to any developer trying to set up their first Sitecore headless next js app on local. I will skip the commands involved in setting up the app on local. When you are done setting up your next js app and execute jss start:connected to run the app, you may face the below error - 

Error: Parse Error: Unexpected whitespace after header value


The Solution 

The whitespace after header value is something added by Feature-Policy setting in HTTP response headers in your local Sitecore instance in IIS. Delete this setting and the error shall go away -



Hope it helps you!

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