Synchronous requests are basically a bad idea because will make your main thread busy and block your user interface. No worries, we can easily create a function that returns a promise when using XHR. Fetch API là một thay thế hiện đại cho XMLHttpRequest. When it first came, this request fetched XML data over Http but it has progressed to fetching other data forms such as JSON, HTML, and plain text. Once you have it, you can initialize a request. I wondered (internally, of course, I didn’t want to lose face in front of the tech-bros) how many years of experience I would need to write that kind of code. Đối tượng XMLHttpRequest có nhiều tùy chọn, sự kiện và thuộc tính phản hồi khác. The four actions an API can take include: Is it too long to understand? Ví dụ: có thể đặt và phát hiện thời gian timeout tính bằng mili giây: và một sự kiện progress thông báo tiến trình tải lên một tệp tin dài: Số lượng tùy chọn nhiều và có một vài sự mâu thuẫn giữa các trình duyệt. Note that the ready state must still be successful to log errors. Thanks to the load event we can provide a callback to our request. Việc hủy bỏ Fetch trước đây không thể thực hiện được nhưng hiện tại nó đã được hỗ trợ trong trình duyệt cài đặt AbortController API. Thật không may, Fetch không phải là sự thay thế hoàn toàn cho các kỹ thuật Ajax.

The generic Headers, Request, and Response interfaces provide consistency while Promises permit … because of the response object. Let’s look at two of them: XMLHttp Request and its successor Fetch API. If you would like to know more about cookies, you might be interested in Cookies: explaining document.cookie and the Set-Cookie header. That’s it! To do that, you need to set the credentials option. Promises are resolved using .then() and .catch() receives errors if the request fails. Even though people used some tricks to create sites that fetch additional data before XMLHttpRequest, the introduction of XHR was quite a milestone in the history of web development. The first thing to do is to create an instance of an XMLHttpRequest object. Fetch API tương đối mới, nó không cung cấp tất cả chức năng XHR và một số tùy chọn rất cồng kềnh. The first time I heard the term API as a beginner, it sounded like something huge and complex. Let’s look at Fetch- the more popular one these days. When fetch with keepalive isn't available, you can consider using the navigator.sendBeacon() API, which can support these use cases while typically delivering a good UX.

For more information check the MDN documentation. Avoiding Access-Control-Allow-Origin CORS error, '', API with NestJS #14. Cần có thêm code để bọc Fetch trong một Promise khác, ví dụ: hay có thể sử dụng Promise.race() để giải quyết khi fetch hay timeouts hoàn thành trước: Thật dễ dàng để kết thúc một request XHR với xhr.abort(). The next thing you do is to open your request using a method. Đoạn code Javascript sau đây biểu thị một request HTTP GET cơ bản đến http://domain/service sử dụng XMLHttpRequest.

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