SseEmitter with proxy

SseEmitter with proxy

By : Abraham Grijalva
Date : October 23 2020, 08:10 AM
wish help you to fix your issue Which proxy do you use? Some proxies need special configurations (content-length, headers, etc.) to support SSE and some don't (like the AWS load balancer (at least last year)).
code :

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Spring rest service with SseEmitter

Spring rest service with SseEmitter

By : Yufeng Chang
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I think you are almost there, Allinone51.
Your call to SseEmitter.send() should probably be in the getUser method. The general pattern is that when you create the SseEmitter you need to "store" it somewhere for other code to get hold of it. You correctly return the SseEmitter from the getSseEmitter method, you just forgot to store it for the other method to be able to call 'send' on it.
code :
private SseEmitter emitter;

@RequestMapping(value = "/{imei}", method = RequestMethod.GET)
public User getUser(@PathVariable String imei) { 
    User myUser = null;

    // .. do resolving of myUser (e.g. database etc).

    // Send message to "connected" web page:
    if (emitter != null) {
        emitter.send(myUser.toString()); // Or format otherwise, e.g. JSON.

    // This return value goes back as a response to your android device
    // i.e. the caller of the getUser rest service.
    return myUser;

@RequestMapping(value = "/sse")
public SseEmitter getSseEmitter() {
    emitter = new SseEmitter();
    return emitter;
Spring SseEmitter over WebSocket connection

Spring SseEmitter over WebSocket connection

By : SKB
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Here is an example of both WebSocket and SSE. As noted above SSE is not supported by IE browsers. Adding as much as I can for completeness. Make sure you are not using a RestController when you use SeeEmitter because that will return the object and that is my guess from the description above.
code :
    <!-- Spring boot framework -->
public class ApplicationWebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer {

    public void configureMessageBroker(MessageBrokerRegistry registry) {

    public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
public class RequestData {
    private String string1;
    private String string2;
    // excluding getters and setters
public class WebSocketController {
    SimpMessagingTemplate simpMessagingTemplate;

    void runWebSocket( RequestData requestData ) {
        new Thread(new RunProcess(requestData)).start();

    private class RunProcess implements Runnable {
        private RequestData requestData;

        RunProcess(RequestData requestData) {
            this.requestData = requestData;

        public void run() {
            simpMessagingTemplate.convertAndSend("/topic/response", requestData.getString1());
            simpMessagingTemplate.convertAndSend("/topic/response", requestData.getString2());
            simpMessagingTemplate.convertAndSend("/topic/response", "A third response via websocket");
public class SseController {

    public SseEmitter runEmitter(@RequestParam(value = "string1") String string1,
                                 @RequestParam(value = "string2") String string2)
        SseEmitter sseEmitter = new SseEmitter();
        RequestData requestData = new RequestData();
        new Thread(new RunProcess(requestData,sseEmitter)).start();
        return sseEmitter;

    private class RunProcess implements Runnable {
        private RequestData requestData;
        private SseEmitter sseEmitter;

        RunProcess(RequestData requestData, SseEmitter sseEmitter) {
            this.requestData = requestData;
            this.sseEmitter = sseEmitter;

        public void run() {
            try {
                sseEmitter.send("A third response from SseEmitter");
            } catch (IOException e) {

    <script src="/javascript/sockjs-0.3.4.js"></script>
    <script src="/javascript/stomp.js"></script>

    <script type="text/javascript">
    var stompClient = null;

    function connect() {
        var socket = new SockJS('http://localhost:8085/socketrequest');
        stompClient = Stomp.over(socket);
        stompClient.connect({}, function(frame) {
            console.log('Connected: ' + frame);
            stompClient.subscribe('/topic/response', function(message){

    function doWebsocket() {
        stompClient.send("/processrequest", {}, JSON.stringify({ 'string1': 'The first string', 'string2' : 'The second string' }));

    function doSse() {
        var rtUrl= '/emitter?string1=first string sse&string2=second string sse';
        var source = new EventSource(rtUrl);

    function showOutput(message) {
        var response = document.getElementById('response');
        var p = document.createElement('p');
        p.style.wordWrap = 'break-word';



Starting page
    <button id="websocket" onclick="doWebsocket();">WebSocket</button>
    <button id="sse" onclick="doSse();">Server Side Events</button>
<div >
    <p id="response"></p>

How to avoid HttpMediaTypeNotAcceptableException with Spring SseEmitter on timeout

How to avoid HttpMediaTypeNotAcceptableException with Spring SseEmitter on timeout

By : William Porquet
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The error was not on the server side. After clicking around on the client a couple of times, there were suddenly two client side EventSource objects. This is what caused the errors.
Media Type not acceptable exception when using SseEmitter

Media Type not acceptable exception when using SseEmitter

By : cc__
Date : March 29 2020, 07:55 AM
help you fix your problem I Was in the middle of doing something else when I got the same issue. The code below fixed it.
Simply put Mismatch Media type.
code :
@GetMapping(value = "/api/push/notification",headers = "Accept=*/*", consumes = MediaType.ALL_VALUE, produces = MediaType.TEXT_EVENT_STREAM_VALUE)
public String doNotify(@RequestParam("authToken") String token, @RequestParam("clientId") String clientId, HttpServletResponse response) throws InterruptedException, IOException {
    final SseEmitter emitter = new SseEmitter(30000l);
        emitter.onCompletion(() -> service.removeEmitter(clientId));
        emitter.onTimeout(() -> service.removeEmitter(clientId));
    return "Connected OK";
public void doNotify(String clientId, Object data) {
    SseEmitter emitter= emitters.get(clientId);
    if(emitter!=null) {
        try {
            emitter .send(SseEmitter.event() .reconnectTime(30000)
                .comment("Client connection notification")
        } catch (Exception e) {
Spring SSEEmitter Getting Completed Mid-way

Spring SSEEmitter Getting Completed Mid-way

By : Mehreen
Date : March 29 2020, 07:55 AM
may help you . Your builder is not being used; you create and configure a builder, but then you send a plain message with 'sseEmitter.send' directly. Try this:
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