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javascript - Chrome 不断为 SSE 发送 GET

问题描述

为什么浏览器（Chrome）不断发送 SSE（服务器发送事件）的 GET 请求？知道为什么吗？

我只通过单击 HTML 页面上的按钮运行下面的“subscribeMe”功能一次。

我知道 SSE 仅通过发送一个 GET 来工作，并收到一个 200 OK .. 然后随着更改，服务器仅通过保持打开的 TCP HTTP/HTTPS 连接推送“数据：.....”。

const state = ['connecting', 'open', 'closed'];
let EPEvent;
function subscribeMe() {
  EPEvent = new EventSource(`/event/${window.sessionStorage.getItem("Token")}/EPRegistration`);
  EPEvent.onmessage = function (e) { console.log(state[this.readyState]); console.log(e); console.log(JSON.parse(e.data)) }
  EPEvent.onopen = function () { console.log(state[this.readyState]) }
}

GET /event/MTSE-960a8337-1f95-495c-a313-92659ba8ba5d/EPRegistration HTTP/1.1
Host: 192.168.1.2
Connection: keep-alive
Accept: text/event-stream
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Referer: http://192.168.1.2/manage
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

HTTP/1.1 200 OK
Connection: keep-alive
Content-Type: text/event-stream
Cache-Control: no-cache
Date: Sun, 08 Mar 2020 21:07:45 GMT
Server: Home SE
Content-Length: 14

data: null

GET /event/MTSE-960a8337-1f95-495c-a313-92659ba8ba5d/EPRegistration HTTP/1.1
Host: 192.168.1.2
Connection: keep-alive
Accept: text/event-stream
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Referer: http://192.168.1.2/manage
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

HTTP/1.1 200 OK
Cache-Control: no-cache
Connection: keep-alive
Content-Type: text/event-stream
Date: Sun, 08 Mar 2020 21:07:48 GMT
Server: Home SE
Content-Length: 14

data: null

GET /event/MTSE-960a8337-1f95-495c-a313-92659ba8ba5d/EPRegistration HTTP/1.1
Host: 192.168.1.2
Connection: keep-alive
Accept: text/event-stream
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Referer: http://192.168.1.2/manage
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

HTTP/1.1 200 OK
Cache-Control: no-cache
Connection: keep-alive
Content-Type: text/event-stream
Date: Sun, 08 Mar 2020 21:07:51 GMT
Server: Home SE
Content-Length: 14

data: null

GET /event/MTSE-960a8337-1f95-495c-a313-92659ba8ba5d/EPRegistration HTTP/1.1
Host: 192.168.1.2
Connection: keep-alive
Accept: text/event-stream
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Referer: http://192.168.1.2/manage
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

HTTP/1.1 200 OK
Cache-Control: no-cache
Connection: keep-alive
Content-Type: text/event-stream
Date: Sun, 08 Mar 2020 21:07:54 GMT
Server: Home SE
Content-Length: 14

data: null

GET /event/MTSE-960a8337-1f95-495c-a313-92659ba8ba5d/EPRegistration HTTP/1.1
Host: 192.168.1.2
Connection: keep-alive
Accept: text/event-stream
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Referer: http://192.168.1.2/manage
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

HTTP/1.1 200 OK
Cache-Control: no-cache
Connection: keep-alive
Content-Type: text/event-stream
Date: Sun, 08 Mar 2020 21:07:57 GMT
Server: Home SE
Content-Length: 14

data: null

GET /event/MTSE-960a8337-1f95-495c-a313-92659ba8ba5d/EPRegistration HTTP/1.1
Host: 192.168.1.2
Connection: keep-alive
Accept: text/event-stream
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Referer: http://192.168.1.2/manage
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

HTTP/1.1 200 OK
Cache-Control: no-cache
Connection: keep-alive
Content-Type: text/event-stream
Date: Sun, 08 Mar 2020 21:08:00 GMT
Server: Home SE
Content-Length: 14

data: null

标签： javascriptgoogle-chrome

解决方案

解决它！

我不应该在我的回复中加上“Content-Length”！.. 这是一个流，Content-Length 没有意义。

现在，它工作正常。

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