This header is required if the request has an Access-Control-Request-Headers header. Output of traefik version: (What version of Traefik are you using?) Be aware that any work the server performs might nonetheless leak through side channels, such . If you click on Get v1 you will get blocked by CORS. The 307 Temporary Redirect code was added to the HTTP standard in HTTP 1.1, as detailed in the RFC2616 specification document . 它允许浏览器向跨源服务器，发出 XMLHttpRequest 请求，从而克服了AJAX只能 同源 使用的限制。. The text . It works from Postman and when I'm cURLing the HTTP GET request Traefik no longer supports the null value, as it is no longer recommended as a return value. Chances are if you are watching this vide. The accessControlMaxAge indicates how long a preflight request can be cached. Writing about projects and challenges in IT tommoulard April 20, 2021, 7:06am #3 Hi there @yuzujoe, I think the plugin traefik-plugin-cors might be able to help you See the pilot's plugin page. 2.1 什么是cors. I am trying to enable CORS on ingress in kubernetes running traefik. In the answer to any preflight request, no CORS header will be found. Here is an example configuration snippet for NGINX, based on Wide open NGINX CORS configuration. yaml/json setting: cors_allow_preflight; Type: bool; Optional; Default: false; Allow unauthenticated HTTP OPTIONS requests as per the CORS spec (opens new window). CORS on Nginx. This criteria matches identifying characteristics about the subject. If your backend is handling the cors responses, then you probably don't want Traefik interfering with them. I have L7 Ingress configured for my two applications with the followin. Is it possible in traefik to catch the response and override the status ? I'm already running an elasticsearch instance behind Traefik for some time, now that I wanted to upgrade Traefik from a version previous 2.0.5 the CORS headers aren't working anymore like expected. 1 Like IAANSEC | WannaCry Analysis Report. Any other kind of HTTP response is not successful and will either end up not being shared or fail the CORS-preflight request. Preflight request: Một cái preflight request là một request được gửi từ phía trình duyệt để thăm dò xem server có hiểu/ hỗ trợ giao thức CORS hay không. If more than one Ingress is defined for a host and at least one Ingress uses nginx.ingress.kubernetes.io/affinity: cookie, then only paths on the Ingress using nginx.ingress.kubernetes.io/affinity will use session cookie affinity. I could do that with Haproxy using a lua script but I'm not sure about traefik. Harden Your Website With Traefik And Security Headers . The error you are getting: To fix the issue and still allow any origin you can use this method instead: .SetIsOriginAllowed (origin => true). Authorization header not passed #4285. The purpose is fixing CORS with angul… Cross-origin resource sharing (CORS) is a browser mechanism which enables controlled access to resources located outside of a given domain. Access-Control-Allow-Origin What is Apigee hybrid? Have tried to disable edge://flags CORS for content scripts w/o success If you could intercept (using a proxy) and change headers in response to preflight request you can bypass CORS on browsers. The following Nginx configuration enables CORS, with support for preflight requests. Traefik has an amazing headers middleware that allows routes to append headers to every response.