The following method did not exist, reactor.netty.resources.ConnectionProvider$Builder...

看控制台给出的提示是因为某个方法不存在导致的。

解决方法：我的boot的版本是2.3.2.RELEASE，将gateway依赖中的reactor-netty版本升高即可

        <!--网关核心依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.projectreactor.netty</groupId>
                    <artifactId>reactor-netty</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.projectreactor.netty</groupId>
            <artifactId>reactor-netty</artifactId>
            <version>0.9.14.RELEASE</version>
        </dependency>