1.前端报错
2.后端报错
3.请求方法

4.后端接收

报错原因是：传过来的参数比较大。若直传一个单独的参数是没有问题。

5.解决方法：在Springboot启动类中添加
6.代码如下
@Bean
public ConfigurableServletWebServerFactory webServerFactory() {
TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
factory.addConnectorCustomizers(new TomcatConnectorCustomizer() {
@Override
public void customize(Connector connector) {
connector.setProperty(“relaxedQueryChars”, “|{}[]”);
}
});
return factory;
}