cors

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at

The server at x3.chatforyoursite.com needs to output the following header: Access-Control-Allow-Origin: http://www.example.com Where http://www.example.com is your website address. You should check your settings on chatforyoursite.com to see if you can enable this – if not their technical support would probably be the best way to resolve this. However to answer your question, you need the … Read more

How to make XMLHttpRequest cross-domain withCredentials, HTTP Authorization (CORS)?

I’ve written an article with a complete CORS setup. I found several issues that can result in this problem: The Access-Control-Allow-Origin cannot be a wildcard if credentials are being used. It’s easiest just to copy the Origin header of the request to this field. It’s entirely unclear why the standard would disallow a wildcard. Firefox … Read more

Exceptions in ASP.NET Web API custom exception handler never reach top level when CORS is enabled

I have found the source of confusion. It seems, WebAPI by default is using this exception handler: https://aspnetwebstack.codeplex.com/SourceControl/latest#src/System.Web.Http/ExceptionHandling/DefaultExceptionHandler.cs and it has major differences from the suggested exception handling in this article: http://www.asp.net/web-api/overview/web-api-routing-and-actions/web-api-global-error-handling see chapter “Appendix: Base Class Details”, where the code of default exception base class is given. In the example it checks for IsOutermostCatchBlock … Read more

Web sockets make ajax/CORS obsolete?

WebSockets will not make AJAX entirely obsolete and WebSockets can do cross-domain. AJAX AJAX mechanisms can be used with plain web servers. At its most basic level, AJAX is just a way for a web page to make an HTTP request. WebSockets is a much lower level protocol and requires a WebSockets server (either built … Read more

Go gin framework CORS

FWIW, this is my CORS Middleware that works for my needs. func CORSMiddleware() gin.HandlerFunc { return func(c *gin.Context) { c.Writer.Header().Set(“Access-Control-Allow-Origin”, “*”) c.Writer.Header().Set(“Access-Control-Allow-Credentials”, “true”) c.Writer.Header().Set(“Access-Control-Allow-Headers”, “Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With”) c.Writer.Header().Set(“Access-Control-Allow-Methods”, “POST, OPTIONS, GET, PUT”) if c.Request.Method == “OPTIONS” { c.AbortWithStatus(204) return } c.Next() } }

Configure cors to allow all subdomains using ASP.NET Core (Asp.net 5, MVC6, VNext)

This has now been implemented in version 2.0.0. In your ConfigureServices use the following: options.AddPolicy(“MyCorsPolicy”, builder => builder .SetIsOriginAllowedToAllowWildcardSubdomains() .WithOrigins(“https://*.mydomain.com”) .AllowAnyMethod() .AllowCredentials() .AllowAnyHeader() .Build() ); Also, don’t forget to call UseCors in your Configure call too: app.UseCors(“MyCorsPolicy”);

Access to XMLHttpRequest at ‘…’ from origin ‘localhost:3000’ has been blocked by CORS policy

if you are building your rest api in nodejs. Follow the folowing simple steps Stop the Node.js server. npm install cors –save Add following lines to your server.js or index.js var cors = require(‘cors’) app.use(cors()) // Use this after the variable declaration Now try to make your api call on the client side and it … Read more