HTTP Error 400 The size of the request headers is too long SharePoint Online Office 365

This SharePoint Online tutorial, we will discuss how to resolve Bad Request – Request Too Long. HTTP Error 400 The size of the request headers is too long error which comes in SharePoint Online Office 365.

Recenty while opening a SharePoint online Office 365 site in Goole Chrome, it shows the below error.

Bad Request – Request Too Long
HTTP Error 400 The size of the request headers is too long

You can see the error screenshot.

HTTP Error 400 The size of the request headers is too long SharePoint
HTTP Error 400 The size of the request headers is too long SharePoint

HTTP Error 400 The size of the request headers is too long SharePoint Online Office 365

The solution that worked for me is to delete the Google chrome browser cache. I was getting the issue of Google Chrome.

Open Google chrome settings. Then expand the Settings menu. Then expand Advanced like below:

http error 400. the size of the request headers is too long. office 365
http error 400. the size of the request headers is too long. office 365

There click on Privacy and security. In the Privacy and security section click on “Clear browsing data”.

he size of the request headers is too long SharePoint
he size of the request headers is too long SharePoint

Then you can select Time range “All time” and then click on “CLEAR DATA” like below:

http error 400. the size of the request headers is too long. sharepoint
http error 400. the size of the request headers is too long. sharepoint

Now open the SharePoint online URL, you will not get the error “HTTP Error 400 The size of the request headers is too long”.

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Hope this SharePoint tutorial, helps to solve Bad Request – Request Too Long. HTTP Error 400 The size of the request headers is too long which comes in Google chrome while opening the SharePoint Online Office 365 site.

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Bijay Kumar

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 SharePointSky.com

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