https://stackoverflow.com › questions › 38235715
Fetch: reject promise and catch the error if status is not OK?Fetch promises only reject with a TypeError when a network error occurs. Since 4xx and 5xx responses aren't network errors, there's nothing to catch. You'll need to throw an error yourself to use Promise#catch.
return Promise.reject(resp.json()); Well, the resp.json promise will be fulfilled, only Promise.reject doesn't wait for it and immediately rejects with a promise. I'll assume that you rather want to do the following: fetch(url).then((resp) => {.
There's no way you are throwing inside of a Promise and Promise.all().then() is still called, Promise.all() will reject on the first rejection of the passed Promise array. throwing should be safe, make sure you actually hit the throw, and make sure you're Promise.all()ing on the right Promises.
https://stackoverflow.com › questions › 29473426
fetch: Reject promise with JSON error object - Stack Overflowreturn Promise.reject(resp.json()); Well, the resp.json promise will be fulfilled, only Promise.reject doesn't wait for it and immediately rejects with a promise. I'll assume that you rather want to do the following: fetch(url).then((resp) => {.
https://developer.mozilla.org › en-US › docs › Web › API › Window › fetch
Window: fetch() method - Web APIs | MDN - MDN Web DocsA fetch() promise only rejects when the request fails, for example, because of a badly-formed request URL or a network error. A fetch() promise does not reject if the server responds with HTTP status codes that indicate errors (404, 504, etc.).
https://fr.javascript.info › promise-error-handling
Gestion des erreurs avec des promesses - JavaScriptLorsqu’une promesse est rejetée, le contrôle saute au gestionnaire de rejet le plus proche. C’est très pratique en pratique. Par exemple, dans le code en dessous de l’URL de fetch est faux (aucun site de ce type) et .catch gère l’erreur :
https://javascript.info › promise-error-handling
Error handling with promises - The Modern JavaScript Tutorialnew Promise((resolve, reject) => { reject(new Error("Whoops!")); }).catch(alert); // Error: Whoops! The "invisible try..catch " around the executor automatically catches the error and turns it into rejected promise. This happens not only in the executor function, but in its handlers as well.
https://developer.mozilla.org › fr › docs › Learn › JavaScript › Asynchronous › Promises
Comment utiliser les promesses - Apprendre le développement web - MDNAvec une API fonctionnant avec des promesses, la fonction asynchrone démarre l'opération et renvoie un objet Promise. On peut alors attacher des gestionnaires à cette promesse et les gestionnaires seront exécutés lors du succès ou de l'échec de l'opération.
La méthode catch() renvoie un objet Promise et ne traite que des cas où la promesse initiale est rejetée. Elle a le même effet qu'un appel à Promise.prototype.then(undefined, siRejetée) (c'est en fait ce qui se passe dans le moteur, obj.catch(onRejected) est traduit en obj.then(undefined, onRejected)). Cela signifie qu'il est nécessaire ...
https://web.dev › articles › introduction-to-fetch
Introduction to fetch() | Articles - web.devThis example defines a status function that checks the response.status and returns either a resolved Promise as Promise.resolve(), or a rejected Promise as Promise.reject(). This is the first method called in the fetch() chain.
https://dev.to › stefanwrightcodes › es6-a-beginners-guide-promises-and-fetch-24ln
ES6 - A beginners guide - Promises and Fetch - DEV CommunityWhen we define a promise we need to handle how/when its resolved and rejected, luckily the Promise had two built in arguments that we can use, these are resolve and reject. Let's have a look at that: promiseResolve = new Promise((resolve, reject) => { resolve() });
https://kettanaito.com › blog › why-fetch-promise-doesnt-reject-on-error-responses
Why Fetch Promise Doesn't Reject on Error ResponsesDespite popular belief, the fetch() Promise does reject, and here's when: Incorrectly constructed request; A network error (e.g. DNS lookup failures, unreachable network);
