Issues with Ajax calls

Question

User1308320631 posted

Hi.

I have a .net core api which works before locally. However, when deploying I get a "no Access-Control-Allow-Origin" header present issue.

I have Cors added in Startus.cs:

services.AddCors(options =>

{
options.AddPolicy("CorsPolicy",
builder => builder.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials());
});

If I call directly, I get a json result perfectly but Ajax gives me this error. On another pc, it gives ERR_CONNECTION_RESET.

The Controller method is:

[HttpPost]
public List<ProductViewModel> GetGenerics(string searchText)
{
List<ProductViewModel> lst = new List<ProductViewModel>();
ProModel prod = new ProViewModel() { Name = "test", IsOrder = true };
lst.Add(prod);
return lst;

}

Can anyone help here?

Thanks

Answer 1

User-832373396 posted

Hi full,

It seems that you missed some steps , and please check this cos as shown below:

   public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddMvc();
           
            services.AddCors(options =>

            {
                options.AddPolicy("CorsPolicy",
                builder => builder.AllowAnyOrigin()
                .AllowAnyMethod()
                .AllowAnyHeader()
                .AllowCredentials());
            });
          
    }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();
            app.UseCors("CorsPolicy");

in controller:

   [HttpPost]
        [EnableCors("CorsPolicy")]
        public List<ProductViewModel> GetGenerics(string searchText)
        {
            List<ProductViewModel> lst = new List<ProductViewModel>();
            ProModel prod = new ProViewModel() { Name = "test", IsOrder = true };
            lst.Add(prod);
            return lst;

        }

Resource :https://docs.microsoft.com/en-us/aspnet/core/security/cors 

With regards,

Angelina Jolie