.Net core - Can not upload file after deploy to IIS

Question

I'm create an api can upload excel file with multipart/form-data. When I run on visual studo, it work normally. But, after deploy to IIS, it can not upload and throw error as below:

has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

I try setting with web.config but it still not work, event api POST, GET, DELETE with json context still working normally.

Could you show us how you have your public void Configure(...) method setup? — Alejandro H
– Alejandro H, Commented Feb 23, 2020 at 3:20

Rosco · Accepted Answer · 2020-02-23 03:57:04Z

1

Have a look at the docs on CORS setup in .net core

In Startup you use services.AddCors() to specify a policy e.g.

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddCors(options =>
            {
                options.AddPolicy("MyPolicy",
                builder =>
                {
                    builder.WithOrigins("http://example.com",
                                        "http://www.contoso.com");
                });
            });

            services.AddMvc();
        }

answered Feb 23, 2020 at 3:57

Rosco

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3 Comments

user3409461 Over a year ago

I try and it not still not working. note: it working normally with normal api, only api upload not work

Alejandro H Over a year ago

In the docs, it mentions you can use .AllowAnyHeader().AllowAnyMethod(); to the bulider, did you try this?

Rosco Over a year ago

@user3409461 are you sure that your content-type is correct for your upload and that the file is not too large? Cors errors can sometimes mask other error messages

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