cors – Page 5 – Tarik Billa

Enable CORS for Web Api 2 and OWIN token authentication

December 12, 2023 by Tarik

I know your issue was solved inside comments, but I believe is important to understand what was causing it and how to resolve this entire class of problems. Looking at your code I can see you are setting the Access-Control-Allow-Origin header more than once for the Token endpoint: app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll); And inside GrantResourceOwnerCredentials method: context.OwinContext.Response.Headers.Add(“Access-Control-Allow-Origin”, new[] … Read more

CORS preflight request fails due to a standard header

December 10, 2023 by Tarik

After a lot of struggling, I finally found the problem. I configured a request mapping in Spring to handle OPTIONS traffic, like this: @RequestMapping(value= “/api/**”, method=RequestMethod.OPTIONS) public void corsHeaders(HttpServletResponse response) { response.addHeader(“Access-Control-Allow-Origin”, “*”); response.addHeader(“Access-Control-Allow-Methods”, “GET, POST, PUT, DELETE, OPTIONS”); response.addHeader(“Access-Control-Allow-Headers”, “origin, content-type, accept, x-requested-with”); response.addHeader(“Access-Control-Max-Age”, “3600”); } I did not know that by default Spring … Read more

How to use Cors anywhere to reverse proxy and add CORS headers

December 8, 2023 by Tarik

CORS Anywhere helps with accessing data from other websites that is normally forbidden by the same origin policy of web browsers. This is done by proxying requests to these sites via a server (written in Node.js, in this case). “To use the API, just prefix the URL with the API URL.”. That’s really all of … Read more

CORS not working php

December 7, 2023 by Tarik

Cached non CORS response conflicts with new CORS request

December 6, 2023 by Tarik

Disable Firefox Same Origin Policy without installing a plugin

December 6, 2023 by Tarik

After having tried to find a Firefox setting for various hours, and after having opened a bounty, I think the right answer to this question is: At the moment of writing (March 2018), it is not possible to disable the same policy origin in Firefox by simply setting a flag. I would personally recommend people … Read more

CORS header ‘Access-Control-Allow-Origin’ does not match… but it does‼

December 5, 2023 by Tarik

I wrestled with this same problem for hours, and discovered that I had added a forward slash to the end of my origin: https://foo.com/, when it should have been https://foo.com. (Talk about a major face-palm moment!) My (now working) Express Node.JS setup: const express = require(‘express’); const cors = require(‘cors’); const app = express(); app.use(cors({ … Read more

Refused to set unsafe header “Origin” when using xmlHttpRequest of Google Chrome

December 5, 2023 by Tarik

This is just a guess, as I use jquery for ajax requests, including CORS. I think the browser is supposed to set the header, not you. If you were able to set the header, that would defeat the purpose of the security feature. Try the request without setting those headers and see if the browser … Read more

Jetty Cross Origin Filter

December 4, 2023 by Tarik

Aloha, I fought this for awhile as well, and found that the final node needs to be: <filter-mapping> <filter-name>cross-origin</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> NOT <filter-mapping> <filter-name>cross-origin</filter-name> <filter-pattern>/*</filter-pattern> </filter-mapping> Here is the link I found to help me: wiki.eclipse.org/Jetty/Feature/Cross_Origin_Filter After I updated my web.xml file and restarted the jetty server, I was able to make cross domain request … Read more

The ‘Access-Control-Allow-Origin’ header contains multiple values ‘, ’, but only one is allowed

December 3, 2023 by Tarik

You are setting CORS twice. I think that is the issue. Please remove any one CORS settings. You can either remove it from web.config or from WebApiConfigFile.cs.