Programmer DD

May 9, 2023 · Backend Development

Why Does Java Throw ‘Request header is too large’ and How to Fix It in Spring Boot

Encountering a java.lang.IllegalArgumentException: Request header is too large? This guide explains the root cause—oversized HTTP headers—and offers two practical solutions: adjusting the server’s max‑http‑header‑size setting in Spring Boot and redesigning requests to keep header data minimal.