The average request header size has significantly decreased during a given period, falling below the mean average minus one standard deviation from the preceding period. This reduction could indicate several potential causes, such as changes in the client-side application, updates to API endpoints, or possibly malicious behavior. A sudden decrease in header size may also suggest that important authentication, session, or other necessary headers are being omitted or stripped, which could affect the API's functionality and security.
An attacker may try to exploit the reduction in request headers by intentionally omitting certain headers, such as authentication tokens or session cookies, to bypass security controls. For example:
Content-Type are reduced, it could lead to unexpected behavior on the server, such as incorrect processing of data or the execution of unwanted operations, potentially causing vulnerabilities or errors.