How to set max-http-header-size in spring boot 2.x application

Mindaugas Jaraminas :

I have Spring boot app running Java 11:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

And I am getting the error: java.lang.IllegalArgumentException: Request header is too large

How to increase max-http-header-size?

Vicent Morera Orchilles :

You should set on the "application.properties" file:

server.max-http-header-size=48000

48000 is an example of an excessive header, put whatever you want.