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.


Recently 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 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


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

the 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


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


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.


Source: Enjoysharepoint

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