Troubleshooting Tip: How to fix 400 Request Header Or Cookie Too Large error for APIs

[jankit6]

Description	This article describes how to fix the issues with FortiSOAR login if it fails due to an error 400 Request Header Or Cookie Too Large error.
Scope	FortiSOAR v7.5.0.
Solution	Sometimes, the users experience difficulties in logging into FortiSOAR or accessing the product page after login, encountering the below error. This issue often occurs with large MMDs that exceed the local storage limit. Log in to FortiSOAR, open the network tab -> Console, clear it, and run the below query toprovide the size of local storage. var _lsTotal=0,_xLen,_x;for(_x in localStorage){ if(!localStorage.hasOwnProperty(_x)){continue;} _xLen= ((localStorage[_x].length + _x.length)* 2);_lsTotal+=_xLen; console.log(_x.substr(0,50)+" = "+ (_xLen/1024).toFixed(2)+" KB")};console.log("Total = " + (_lsTotal / 1024).toFixed(2) + " KB"); If the total size exceeds more than 10 MB then try the below workaround. vi /etc/nginx/conf.d/cyops-api.conf large_client_header_buffers 16 32k; Append the following in '/etc/nginx/conf.d/cybersponse/location.conf' file and restart all services. fastcgi_param HTTP_COOKIE ""   Note: Take a backup of files or take a VM snapshot before making any changes from the backend.