Spring SseEmitter导致响应提交后无法转发异常 [英] Spring SseEmitter causes Cannot forward after response has been committed exception

问题描述

给定一个具有如下方法的简单控制器:

Given a simple controller with a method like this:

@RequestMapping(method = RequestMethod.GET, value = "{id}/update")
public ResponseEntity<SseEmitter>  update() throws IOException {
    final SseEmitter  sseEmitter = new SseEmitter();

    return ResponseEntity.ok(sseEmitter);
}

我也这样试过:

@RequestMapping(method = RequestMethod.GET, value = "{id}/update")
public SseEmitter  update() throws IOException {
    final SseEmitter  sseEmitter = new SseEmitter();

    return sseEmitter;
}

但是，Tomcat 8.0.21 在发出请求 30 秒后，两种方式都会抛出上述异常.幕后发生了什么?

But both way Tomcat 8.0.21 throws the aforementioned exception 30 seconds after the request issued. What is happening under the hood?

推荐答案

这可能是 servlet 容器的默认异步超时.您可以使用 Spring 更改默认值:

This may be the default async timeout of your servlet container. You can change the default value with Spring:

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
        configurer.setDefaultTimeout(1000000);
    }

}

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