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.

Why is an OPTIONS request sent and can I disable it?

I am building a web API. I found whenever I use Chrome to POST, GET to my API, there is …

http cors preflight
AngularJS performs an OPTIONS HTTP request for a cross-origin resource

I'm trying to setup AngularJS to communicate with a cross-origin resource where the asset host which delivers my template files …

angularjs cors cross-domain preflight
How to skip the OPTIONS preflight request?

I had developed a PhoneGap app which is now being transformed to a mobile website. Everything works smoothly besides one …

angularjs post cors preflight
How to resolve 'preflight is invalid (redirect)' or 'redirect is not allowed for a preflight request'

I have followed this step to setup my server to enable CORS. https://docs.microsoft.com/en-us/aspnet/web-api/overview/…

cors preflight
CORS - What is the motivation behind introducing preflight requests?

Cross-origin resource sharing is a mechanism that allows a web page to make XMLHttpRequests to another domain (from wikipedia). I've …

ajax html http cors preflight
Missing token 'access-control-allow-headers' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel

I have two VS projects : one exposing MVC5 controllers, the other being an angular client. I want the angular client …

angularjs asp.net-mvc cors preflight
No 'Access-Control-Allow-Origin' header is present on the requested resource + The response had HTTP status code 401

XMLHttpRequest cannot load http://192.168.1.253:8080/... No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not …

javascript angular cors preflight
CORS request with Preflight and redirect: disallowed. Workarounds?

I'm designing an API that allows the user to authenticate (using tokens) and that contains redirects within the same domain. …

http redirect cors preflight
Confused about how to handle CORS OPTIONS preflight requests

I'm new to working with Cross Origin Resource Sharing and trying to get my webapp to respond to CORS requests. …

angularjs tomcat spring-mvc cors preflight