required a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' that could not be found.

原因：gateway与spring-boot-starter-web不兼容，需要

Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.

原因：子模块将javax.servlet-api传递给了gateway,需要阻止传递，或者将javax.servlet-api像web一样exclusion