看来您想关闭移动设备上可能发生的废弃HTTP连接。

@RestController
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Bean
    public EmbeddedServletContainerFactory getEmbeddedServletContainerFactory() {
        TomcatEmbeddedServletContainerFactory containerFactory = new TomcatEmbeddedServletContainerFactory();
        containerFactory
                .addConnectorCustomizers(new TomcatConnectorCustomizer() {
                    @Override
                    public void customize(Connector connector) {
                        ((AbstractProtocol) connector.getProtocolHandler()).setConnectionTimeout(100);
                    }
                });

        return containerFactory;
    }

    @RequestMapping
    public String echo(@RequestBody String body) {
        return body;
    }
}

连接超时已设置为100毫秒，以便快速运行测试。数据按块发送。在每个块之间，正在运行的线程被挂起x毫秒。

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = DemoApplication.class)
@WebIntegrationTest("server.port:19000")
public class DemoApplicationTests {

    private static final int CHUNK_SIZE = 1;
    private static final String HOST = "http://localhost:19000/echo";

    @Rule
    public ExpectedException expectedException = ExpectedException.none();

    @Test
    public void slowConnection() throws Exception {
        final HttpURLConnection connection = openChunkedConnection();
        OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());

        writeAndWait(500, out, "chunk1");
        writeAndWait(1, out, "chunk2");

        out.close();

        expectedException.expect(IOException.class);
        expectedException.expectMessage("Server returned HTTP response code: 400 for URL: " + HOST);

        assertResponse("chunk1chunk2=", connection);
    }

    @Test
    public void fastConnection() throws Exception {
        final HttpURLConnection connection = openChunkedConnection();
        OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());

        writeAndWait(1, out, "chunk1");
        writeAndWait(1, out, "chunk2");

        out.close();

        assertResponse("chunk1chunk2=", connection);
    }

    private void assertResponse(String expected, HttpURLConnection connection) throws IOException {
        Scanner scanner = new Scanner(connection.getInputStream()).useDelimiter("\\A");
        Assert.assertEquals(expected, scanner.next());
    }

    private void writeAndWait(int millis, OutputStreamWriter out, String body) throws IOException, InterruptedException {
        out.write(body);
        Thread.sleep(millis);
    }

    private HttpURLConnection openChunkedConnection() throws IOException {
        final URL url = new URL(HOST);
        final HttpURLConnection  connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setChunkedStreamingMode(CHUNK_SIZE);
        return connection;
    }
}

将包的日志级别设置org.apache.catalina.core为DEBUG

logging.level.org.apache.catalina.core=DEBUG

您会看到一个SocketTimeoutException要slowConnection测试的。

我不知道为什么要使用HTTP状态代码502作为错误响应状态。HTTP
502说：

502（错误的网关）状态代码表示服务器充当网关或代理时，从尝试执行请求的过程中访问的入站服务器收到无效响应。

客户端Postman调用您的服务器应用程序。我看不到两者之间的任何网关或代理。

如果您只是将问题压缩到最低限度，而实际上您想自己构建一个代理，则可以考虑使用Netflix
Zuul。

2016年3月23日更新：

这是OP关于Stackoverflow的问题的根本原因：

我对longpolling所做的事情是，从服务apihibernate线程一段时间，然后将其唤醒，然后一次又一次地执行直到直到某些数据库状态完成为止。

该实现实际上阻止了Tomcat工作线程处理新的HTTP请求。因此，每增加一个长时间运行的操作，您的请求吞吐量就会降低。

我建议将长时间运行的操作卸载到单独的线程中。客户端（浏览器）启动一个新请求以获取结果。根据处理状态，服务器将返回结果或通知/错误/警告/。

这是一个非常简单的示例：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import static org.springframework.http.HttpStatus.CREATED;
import static org.springframework.http.HttpStatus.NOT_FOUND;
import static org.springframework.http.HttpStatus.OK;

@RestController
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    private ExecutorService executorService = Executors.newFixedThreadPool(10);
    private Map<String, String> results = new ConcurrentHashMap<>();

    @RequestMapping(path = "put/{key}", method = RequestMethod.POST)
    public ResponseEntity<Void> put(@PathVariable String key) {
        executorService.submit(() -> {
            try {
                //simulate a long running process
                Thread.sleep(10000);
                results.put(key, "success");
            } catch (InterruptedException e) {
                results.put(key, "error " + e.getMessage());
                Thread.currentThread().interrupt();
            }
        });
        return new ResponseEntity<>(CREATED);
    }

    @RequestMapping(path = "get/{key}", method = RequestMethod.GET)
    public ResponseEntity<String> get(@PathVariable String key) {
        final String result = results.get(key);
        return new ResponseEntity<>(result, result == null ? NOT_FOUND : OK);
    }
}