javascript - 通过后端异步REST调用，JavaScript提取耗时14秒(JavaScript fetch is taking 14 seconds with backend-asynchronous REST call)

Question

I have a web app that does backend-asynchronous REST calls.

(我有一个Web应用程序，可以执行后端异步REST调用。)

When I say backend-asynchronous REST calls what I mean is that the backend receives the REST call and replies to it on a different thread (it uses a queue and a thread pool...).

(当我说后端异步REST调用时，我的意思是后端接收REST调用并在另一个线程上对其进行回复（它使用队列和线程池...）。)

All of this seems to be working fine.

(所有这些似乎都工作正常。)

I do a GET from JavaScript to get new HTML pages so that I can process it before it gets added to the DOM.

(我从JavaScript进行GET获取新的HTML页面，以便可以在将其添加到DOM之前对其进行处理。)

I am using the following code to get the HTML pages:

(我正在使用以下代码来获取HTML页面：)

static async getHTML( url, callback ) {

    let response;
    try {
        response = await fetch(url, {    // AAA
            method: 'GET',
            headers: {
                'Content-type': 'text/plain'
            }
        });
        let y = 1;                       // BBB
    } catch (err) {
        let x = 1;
    }
    try {
        let r = await response.text();
        callback(r);
    } catch (err) {
        let z = 1;
    }
}

The first time I use getHTML, it works fine.

(第一次使用getHTML时，效果很好。)

I then call a REST service and have verified that it is completing before I call getHTML the second time.

(然后，我调用REST服务，并在第二次调用getHTML之前已验证它已完成。)

The second time I call getHTML, it takes 14 seconds to go from AAA to BBB on a local server.

(第二次调用getHTML时，在本地服务器上从AAA到BBB花费14秒。)

If I eliminate the REST call, the second call to getHTML is instantaneous.

(如果我取消了REST调用，则第二次调用getHTML是瞬时的。)

So, something about the REST call is causing getHTML's fetch to take 14 seconds.

(因此，有关REST调用的某些操作导致getHTML的提取需要14秒钟。)

Again, I have verified that the REST call is completing before I am calling getHTML.

(同样，在调用getHTML之前，我已验证REST调用已完成。)

Any help on why this is now taking 14 seconds is greatly appreciated.

(非常感谢您对为什么现在需要14秒的任何帮助。)

Blake McBride

(布莱克·麦克布莱德)

  ask by Blake McBride translate from so

Answer 1

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