fetch-api

I'm writing a wrapper around fetch that I would like to add something to the URL before making the request e.g. identifying query parameters. I can't figure out how to make a copy of a given a Request object with a different URL than the original. My code looks like: // My function which tries to modify the URL of the request function addLangParameter(request) { const newUrl = request.url + "?lang=" + lang; return new Request(newUrl, /* not sure what to put here */); } // My fetch wrapper function myFetch(input, init) { // Normalize the input into a Request object return Promise.resolve(new

I thought same origin implies no CORS, and vice-versa. What's the difference between the two options for JavaScript's Fetch API's mode option? Also, in the specs, it says: Even though the default request mode is "no-cors", standards are highly discouraged from using it for new features. It is rather unsafe. Why is it unsafe? Source: https://fetch.spec.whatwg.org/#requests With same-origin you can perform requests only to your origin, otherwise the request will result in an error. With no-cors , you can perform requests to other origins, even if they don't set the required CORS headers, but you

I'm using the Fetch API to get some (public) data from a webpage. Here is my code: const proxyurl = "https://cors-anywhere.herokuapp.com/"; var bookUrl = "the+old+man+and+the+sea"; var url = 'https://miss.ent.sirsidynix.net/client/en_US/mlsathome/search/results?qu=' + bookUrl + '&te=ILS'; fetch(proxyurl + url).then(function(result){ return result.text(); }).then(function(text){ var parser = new DOMParser(); var html = parser.parseFromString(text, 'text/html'); var divs = html.getElementsByTagName('div'); var x = html.getElementsByTagName('thead'); console.log(divs); console.log(x); }); The

my aim is to fetch data from two URLs and perform an action only when both have come back successfully. On the other hand i want to return an error if either of them fail. I have played around with my code and managed to get the desired effect. My question is, is there a more efficient, succinct way of achieving the same functionality? Helper functions let status = (r) => { if (r.ok) { return Promise.resolve(r) } else { return Promise.reject(new Error(r.statusText)) } } let json = (r) => r.json(); Requests let urls = [ 'http://localhost:3000/incomplete', 'http://localhost:3000/complete' ] let

I'm trying to fetch a curl and get a JSON from an API. curl -XPOST -d "grant_type=password" -d "username=admin@admin.admin" \ -d "password=admin" "web_app@localhost:8081/oauth/token" When I use the curl in terminal everything works fine but trying it with a fetch I get the error message mentioned at the bottom. fetch("http://web_app@localhost:8081/oauth/token", { credentials: 'include', body: "grant_type=password&username=admin@admin.admin&password=admin", headers: { "Content-Type": "application/x-www-form-urlencoded", }, method: "POST" } This is the error I get: TypeError: http://web_app