Angular 4/ASP.Net Core-Call to /AbpUserConfiguration/GetAll #3579

Hi,

When deploying the angular 4 application on one port and the .net core in another there is a call from the browser made to the endpoint /AbpUserConfiguration/GetAll with the OPTIONS method. This call fails from the angular application but it is successful for a GET request from a browser.

The angular app logs the following error: OPTIONS <a class="postlink" href="http://x.x.x.x:22741/AbpUserConfiguration/GetAll">http://x.x.x.x:22741/AbpUserConfiguration/GetAll</a> net::ERR_EMPTY_RESPONSE

The asp.net core app logs the following:

Microsoft.AspNetCore.Server.Kestrel      - Connection id "0HL6E2JO8MMJV" started.
Microsoft.AspNetCore.Server.Kestrel      - Connection id "0HL6E2JO8MMJR" stopped.
Microsoft.AspNetCore.Server.Kestrel      - Connection id "0HL6E2JO8MMJU" disconnecting.
Microsoft.AspNetCore.Server.Kestrel      - Connection id "0HL6E2JO8MMJU" sending FIN.
Microsoft.AspNetCore.Server.Kestrel      - Connection id "0HL6E2JO8MMJU" sent FIN with status "0".

I think this is a Cors issue but I do not know how to solve it. I have tried the following two configurations but neither seems to work.

//Configure CORS for angular2 UI
            services.AddCors(options =>
            {
                options.AddPolicy(DefaultCorsPolicyName, builder =>
                {
                //App:CorsOrigins in appsettings.json can contain more than one address with splitted by comma.
                builder
                    //.WithOrigins(_appConfiguration["App:CorsOrigins"].Split(",", StringSplitOptions.RemoveEmptyEntries).Select(o => o.RemovePostFix("/")).ToArray())
                    .AllowAnyOrigin() //TODO: Will be replaced by above when Microsoft releases microsoft.aspnetcore.cors 2.0 - https://github.com/aspnet/CORS/pull/94
                    .AllowAnyHeader()
                    .WithMethods(new string[] {"OPTIONS","GET","POST","PUT","DELETE", "HEAD" });
                });
            });

//Configure CORS for angular2 UI
            services.AddCors(options =>
            {
                options.AddPolicy(DefaultCorsPolicyName, builder =>
                {
                    //App:CorsOrigins in appsettings.json can contain more than one address with splitted by comma.
                    builder
                        //.WithOrigins(_appConfiguration["App:CorsOrigins"].Split(",", StringSplitOptions.RemoveEmptyEntries).Select(o => o.RemovePostFix("/")).ToArray())
                        .AllowAnyOrigin() //TODO: Will be replaced by above when Microsoft releases microsoft.aspnetcore.cors 2.0 - https://github.com/aspnet/CORS/pull/94
                        .AllowAnyHeader()
                        .AllowAnyMethod();
                });
            });