fetch | 易学教程

How to use fetch correctly?

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问题 I'm working on my application now. I'm trying to use fetch for login page, but I don't really understand how to use fetch even reading some example of code. Could anyone please help me get that? For instance, I have to use these information to login to my server. username: "user" password: "1234" then I want server return that login success or not and return a token if loging in is success I tried to used this code render() { return ( fetch('mysite', { method: 'POST', body: JSON.stringify({

Parallel fetch requests in react native

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问题 I am developing a new app in react native and I need to make 20 fetches to my api in parallel. When I developed in phone gap, I could create 20 web workers for the Ajax calls to happen parallel. When I am executing 20 fetches in parallel in react native it looks like every fetch is taking longer than the one before. Like it has a queue of fetches and it won't run them together. Is there any way to solve this? Now it takes like 1 minute to finish the fetches when in my phonegap app it takes

fetch promises - return 500 internals server error

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问题 I am trying to handle 500 internal server errors inside fetch. If an internal error occurs, the server responds with a message. I want to extract that message. const req = new Request(url, { method: node.method, mode: 'cors', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body), }); fetch(req) .then((response) => { if (response.status === 500) { // res.json extracts the body from the response as a promise, chain // .then on it and throw an error to be caught in the

Fetch API how to get response body in catch?

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问题 I got the response from server like this: Request URL:http://api.bfexchange.net/wallet/balance Request Method:GET Status Code:504 Gateway Time-out Remote Address:52.78.140.154:80 Referrer Policy:no-referrer-when-downgrade But printing err in catch of fetch API just returns Error object. fetch(...) .then(...) .catch((err) => { console.dir(err); }); It prints this(from Google Chrome): TypeError: Failed to fetch message: "Failed to fetch" stack: "TypeError: Failed to fetch" __proto__: Error

Why is Safari duplicating GET request but Chrome is not?

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问题 Update TL;DR : This is potentially a bug in Safari and/or Webkit. Longer TL;DR : In Safari, after the Fetch API is used to make a GET request, Safari will automatically (and unintentionally) re-run the the request when the page is reloaded even if the code that makes the request is removed . Newly discovered minimal reproducible code (courtesy of Kaiido below): Front end <script>fetch('/url')</script> Original Post I have a javascript web application which uses the fetch API to make a GET

WebAssembly InstantiateStreaming Wrong MIME type

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问题 I am attempting to get this tutorial (here: https://www.hellorust.com/demos/add/index.html) to work, and it seems that whatever I do, I cannot get the WebAssembly MDN reserved function to properly work. So, I followed the instructions on the link above and got an add.wasm file. As far as I can tell this should be fairly simple and should work. After a little digging I found that the newest WebAssembly module is to instantiate streaming - the documentation for which can be found here: (https:/

ajax、axios、fetch的区别

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1. ajax 使用步骤创建 XmlHttpRequest 对象调用 open 方法设置基本请求信息设置发送的数据，发送请求注册监听的回调函数拿到返回值，对页面进行更新 //1.创建Ajax对象 if ( window . XMLHttpRequest ) { var oAjax = new XMLHttpRequest ( ) ; } else { var oAjax = new ActiveXObject ( 'Microsoft.XMLHTTP' ) ; } //2.连接服务器（打开和服务器的连接） oAjax . open ( 'GET' , url , true ) ; //3.发送 oAjax . send ( ) ; //4.接收 oAjax . onreadystatechange = function ( ) { if ( oAjax . readyState == 4 ) { if ( oAjax . status == 200 ) { //alert('成功了：'+oAjax.responseText); fnSucc ( oAjax . responseText ) ; } else { //alert('失败了'); if ( fnFaild ) { fnFaild ( ) ; } } } } ; 优缺点：本身是针对MVC的编程

ES6 - Fetch API

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参考 Fetch API | MDN 来源： https://www.cnblogs.com/tangge/p/12181632.html

XMLHttpRequest、fetch、Ajax 三种前后端交互方法

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一、原生XMLHttpRequest方法 const BASE_URL = “http://10.2.0.150” 1.原生实现 GET /* // 1. 创建请求对象 let xhr = new XMLHttpRequest(); // 2. 配置请求 // -> xhr.open(method, url, sync) xhr.open(“GET”, ${BASE_URL}/heros?id=1 , true); // -> 设置响应类型 xhr.responseType = “json”; // -> 设置请求超时时间 xhr.timeout = 10000; // 3. 发送请求 xhr.send(); // 4. 事件监听 // -> 请求完成 xhr.onload = function() { // readyState 请求状态 // status 状态码 if(xhr.status == 200) { // 打印结果 console.log(xhr.response); }else { console.log( XMLHttpRequest_ERROR_STATUS：${xhr.status} ); } }*/ 2.原生实现 POST // 1. 创建请求对象 let xhr = new XMLHttpRequest(); // 2. 配置请求 // -> xhr

Hibernate查询优化——类级别查询（集合策略）

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1、类级别查询： get方法和load方法：（1）get方法： public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Student student=session.get(Student.class,201811); System.out.println(student); transaction.commit(); session.close(); } 特点：执行get方法时，立即发送查询语句查询结果。（2）load方法（延迟加载，即：只有在使用的时候才会进行查询）： public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Student student=session.load(Student.class,201811); System.out.println(student); transaction.commit(); session.close();