cors

Google’s Places API and JQuery request – Origin http://localhost is not allowed by Access-Control-Allow-Origin

You’re trying to use the Places API web service, which is meant for use from server code and does not support the JSONP output you’d need for JavaScript. In JavaScript, you need to use the Places Library from the Maps API V3. You can’t just hit a URL directly from JavaScript or jQuery code. (You … Read more

Enable CORS with wamp on windows 8

I had the same problem and i solved it with these 3 steps: 1) in Apache config file (for me the path was C:\wamp\bin\apache\apache2.4.18\conf\httpd.conf) add the line: Header set Access-Control-Allow-Origin “*” in the content of the <Directory> tag: DocumentRoot “c:/wamp/www” <Directory “c:/wamp/www/”> Options +Indexes +FollowSymLinks Header set Access-Control-Allow-Origin “*” AllowOverride all Require local </Directory> 2) … Read more

Slack incoming webhook: Request header field Content-type is not allowed by Access-Control-Allow-Headers in preflight response

That Slack API endpoint unfortunately appears to be broken in its handling of cross-origin requests from frontend JavaScript code—in that it doesn’t handle the CORS preflight OPTIONS request as it should—so the only solution seems to be to omit the Content-Type header. So it looks like you need to remove the following from the headers … Read more

.NET Web API CORS PreFlight Request

You can add a handler to deal with this type of request. Create a class derive from “DelegatingHandler”: public class PreflightRequestsHandler : DelegatingHandler { protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { if (request.Headers.Contains(“Origin”) && request.Method.Method.Equals(“OPTIONS”)) { var response = new HttpResponseMessage { StatusCode = HttpStatusCode.OK }; // Define and add values to variables: origins, … Read more

XMLHttpRequest: Network Error 0x80070005, Access is denied on Microsoft Edge (but not IE)

This problem should no longer exist for developers using Microsoft Edge. If you experience issues with localhost testing, navigate to about:flags, and make sure Allow localhost loopback is checked. Microsoft Edge does not currently support (out of the box) localhost testing. You can however enable it by following the guidance provided here: http://dev.modern.ie/platform/faq/how-can-i-debug-localhost/. We’re working … Read more

WebAPI CORS with Windows Authentication – allow Anonymous OPTIONS request

I used self-hosting with HttpListener and following solution worked for me: I allow anonymous OPTIONS requests Enable CORS with SupportsCredentials set true var cors = new EnableCorsAttribute(“*”, “*”, “*”); cors.SupportsCredentials = true; config.EnableCors(cors); var listener = appBuilder.Properties[“System.Net.HttpListener”] as HttpListener; if (listener != null) { listener.AuthenticationSchemeSelectorDelegate = (request) => { if (String.Compare(request.HttpMethod, “OPTIONS”, true) == 0) … Read more

How to enable cors in ASP.NET Core 6.0 Web API project?

Add service builder.Services.AddCors and app add app.UseCors(“corsapp”); replace builder.WithOrigins(“*”) with builder.WithOrigins(“http://localhost:800”, “https://misite.com”); check documentation var builder = WebApplication.CreateBuilder(args); // Add services to the container. builder.Services.AddControllers(); // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle builder.Services.AddEndpointsApiExplorer(); builder.Services.AddSwaggerGen(); //services cors builder.Services.AddCors(p => p.AddPolicy(“corsapp”, builder => { builder.WithOrigins(“*”).AllowAnyMethod().AllowAnyHeader(); })); var app = builder.Build(); if (app.Environment.IsDevelopment()) { app.UseSwagger(); app.UseSwaggerUI(); } … Read more