Receiving Failed to fetch error or page crashing while browsing through the site

Problem

Header bidding network partners and Consent Management Platforms (CMPs) can increase the number and size of cookies set in a user’s browser, especially when multiple vendors are involved.

This can lead to HTTP request headers exceeding the default LimitRequestFieldSize value on the server, causing “400 Bad Request” or “Failed to fetch” errors.

To handle this, it is recommended to increase the server’s LimitRequestFieldSize setting (e.g., in Apache or NGINX) to accommodate the larger header sizes and prevent request failures.

Solution

Please reach out to support if increasing the cookie size limit does not resolve the issue.