spring boot 2.X 使用tomcat 9.X版本issue

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本文介绍了在Spring Boot 2.x版本中遇到使用Tomcat 9.x启动异常的问题，详细分析了异常的原因，并提出了针对性的解决方案，通过调整Tomcat Bean配置，成功解决了启动问题，最终实现应用无报错顺利启动。

spring boot 2.X 使用tomcat 9.X版本issue

启动异常

启动异常

The HTTP header line [spas-accesskey0x0d] does not conform to RFC 7230 and has been ignored

异常分析

The way that errors that occur very early during HTTP request processing are reported is the same in Spring Boot 2.3.1 as it was in 2.0.x. What has changed here is that Tomcat is now generating an error where it was not previously. Tomcat 9 more strictly enforces the HTTP specification, rejecting non-compliant header names and values with a 400 response. You can get back to Tomcat 8.5's behaviour where your non-spec-compliant request was still accepted by customising Tomcat's connector so that illegal headers are not rejected

解决方案(tomcat bean 配置)

@Bean
TomcatConnectorCustomizer headerRejectionCustomizer() {
    return (connector) -> 
        ((AbstractHttp11Protocol<?>)connector.getProtocolHandler()).setRejectIllegalHeader(false);
}