fetch-api

问题 I am executing useEffect() to update a state with JSON data. However the fetch request sometimes fails, so I want to re-execute the useEffect hook if that happens: ... import React, {useState, useEffect} from 'react'; import {getJsonData} from './getJsonData'; const myApp = () => { var ErrorFetchedChecker = false; const [isLoading,setIsLoading] = useState(true); const [data,setData] = useState(null); const updateState = jsonData => { setIsloading(false); setData(jsonData); }; useEffect(() =>

问题 so I have 2 endpoints, I'm making a "post" request to the first one and in the response I should get some kind of id that I use in the second request endpoint url. so I want to make a delay or something till I get the response from the first request. req = () => { fetch('url', { method: 'POST', headers: { 'Authorization': bearer, 'Content-Type': 'application/json', }, body: }) .then(response => response.json()) .then(json => { }) fetch(`url with the id I get from the first request`, { method:

问题 so I have 2 endpoints, I'm making a "post" request to the first one and in the response I should get some kind of id that I use in the second request endpoint url. so I want to make a delay or something till I get the response from the first request. req = () => { fetch('url', { method: 'POST', headers: { 'Authorization': bearer, 'Content-Type': 'application/json', }, body: }) .then(response => response.json()) .then(json => { }) fetch(`url with the id I get from the first request`, { method:

问题 I'm trying to use Fetch API to handle POST of XML data to avoid cross-origin issues with XmlHttpRequest. The issue I face is that despite setting my Content-Type to 'text/xml' (which is the only supported content-type header in this case) my request's content-type is being reset to text/plain resulting in a HTTP status of 415 from the requested content. Here is my fetch function: function doFetch(Content) { return fetch( URL, { method: 'POST', mode: 'no-cors', headers: new Headers( {'Content

问题 I'm trying to use Fetch API to handle POST of XML data to avoid cross-origin issues with XmlHttpRequest. The issue I face is that despite setting my Content-Type to 'text/xml' (which is the only supported content-type header in this case) my request's content-type is being reset to text/plain resulting in a HTTP status of 415 from the requested content. Here is my fetch function: function doFetch(Content) { return fetch( URL, { method: 'POST', mode: 'no-cors', headers: new Headers( {'Content

问题 I have a generated React site I am hosting in an S3 bucket. One of my components attempts to fetch something when loaded: require('isomorphic-fetch') ... componentDidMount() { fetch(`${url}`) .then(res => { console.log(res); this.setState({ users: res }) }) .catch(e => { // do nothing }) } The url I am fetching is an AWS API Gateway. I have enabled CORS there, via the dropdown, with no changes to the default configuration. In my console, for both the remote site and locally during development

问题 I was getting an error when returning response.json() when I would do a request with an empty response body, so I'm trying to just return an empty object when there is an empty body. The approach I was going for is to check the Content-Length header of the response, however, somehow response.headers.get('Content-Length') somehow returns null . Here is my code: function fetchJSON(url, options, state = null) { return fetch(url, Object.assign({}, options, { // TODO: Add options here that should

问题 I was getting an error when returning response.json() when I would do a request with an empty response body, so I'm trying to just return an empty object when there is an empty body. The approach I was going for is to check the Content-Length header of the response, however, somehow response.headers.get('Content-Length') somehow returns null . Here is my code: function fetchJSON(url, options, state = null) { return fetch(url, Object.assign({}, options, { // TODO: Add options here that should

问题 When I use the fetch API (Or xmlhttprequest) I get a 0 byte response. Here is a sample of my code: fetch("https://myurl", { method: "POST", headers: { 'Accept': 'application/json', 'Content-Type': 'application/json' }, body: JSON.stringify({content: content}) }).then(function(res){ return res.text()}).then(function(res){ return cb(res);}); In the network tab, and in the console.log(res) in the callback, the response is empty. I should note that the response is including a CORS response

问题 What happens when I execute several fetch at the same time? Does each fetch run completely separately and one fetch doesn't have to wait for another to finish? Or are all the fetch somehow "linked"? Let us take a concrete example: - I execute two fetch at the same time, one that calls an API and asks to retrieve information and the other one that calls another API but this one has a 'long response time' (so the fetch will run for a long time). Can the second fetch influence the response time