Top "Preflight" questions

A preflight is an HTTP OPTIONS request that browsers (automatically on their own) send to servers before trying certain kinds of cross-origin requests — in order to determine if a server has opted-in to receiving those kinds of requests.

axios preflight fail error 301 using vue.js

I've got a Laravel 5.4 API, that works fine in Postman and the Browser. Localhost works fine- Laravel 5.4 is running on …

vue.js cors laravel-5.4 axios preflight
Response to preflight: “No 'Access-Control-Allowed-Origin'” despite CORS-enabled

I am having trouble figuring out an issue with an angular 4 preflight request not passing a CORS access-control check: “No …

asp.net-web-api cors angular2-forms angular2-observables preflight
angular.js $resources setting Authorization header

js what I'm trying to do is making REST API REQUEST to server. A request should be 'GET' method and …

angularjs http-headers preflight
Convert CMYK PDF into spot colors (colours)

Is it possible to pre-process (in batch) PDFs that are in CMYK format to separate out into spot colours? I …

pdf printing cmyk preflight
CORS problems in WebAPI hosted in IIS

I'm trying to implement an application that uses the same Token Based Authentication mechanism demonstrated in this really awesome example …

iis asp.net-web-api cors preflight
Angular 2 - Response for preflight has invalid HTTP status code 401

I know there a already lot of same solved issues here, but unfortunately none of them helped me :-(. Here …

angular cors preflight
Spring security, cors error when enable Oauth2

I'm getting an error while querying my oauth/token endpoint. I've configured cors enable for my resource / also tried to …

spring spring-mvc cors preflight
How to handle an invalid CORS preflight request?

Suppose a CORS preflight request comes in, but it specifies an unsupported value for one or more Access-Control-Request-* headers. How …

cors preflight
CORS preflight request with Django and Angular

I ham trying to make a request to a REST api. It is a CORS request. My frontend : Angular 1.5 (localhost:3000) …

javascript angularjs django cors preflight