This SharePoint Online tutorial explains how to solve the error,
While browsing SharePoint Online sites in Google chrome it gave the error as http error 400. the size of the request headers is too long. When I tried to open in Internet Explorer, the SharePoint sites were opening fine. The error looks like below:
To solve the issue you need to clear Google chrome browser cache.
In Chrome click on : -> More Tools -> Clear browsing data like below:
Then click on Clear Data to clear Google chrome cache.
Once you clear the Cache, you will be able to open your SharePoint Online site.
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I hope this will be helpful to resolve the error: http error 400. the size of the request headers is too long SharePoint.
I am Bijay from Odisha, India. Currently working in my own venture TSInfo Technologies in Bangalore, India. I am Microsoft Office Servers and Services (SharePoint) MVP (5 times). I works in SharePoint 2016/2013/2010, SharePoint Online Office 365 etc. Check out My MVP Profile.. I also run popular SharePoint web site EnjoySharePoint.com