Using Blazor wasm I can't access content-disposition response header

Question

Using Blazor I am making an API call which returns an Excel file, I am trying to access the content-disposition response header which I can see is present using Chrome dev tools :

content-disposition: attachment; filename=report-285-20200603183055.xlsx; filename*=UTF-8''report-285-20200603183055.xlsx

I am using this code but it returns false :

if (httpResponseMessage.Headers.TryGetValues("content-disposition", out IEnumerable<string> extractedHeaders))

How can I access the content-disposition value, I want to extract the filename out? Just to add, I am exposing the header in Startup.cs ConfigureServices() in the API project :

            services.AddCors(o => o.AddPolicy("CorsPolicy", builder => {
            builder
            ...
            .WithExposedHeaders(new string[] { "Location", "location", "Content-disposition","content-disposition" })

score 1 · Answer 1 · answered Nov 17 '20 at 21:16

1

You have to use

Response.Content.Headers

To get that header, Response.Headers does not contain it

answered Nov 17 '20 at 21:16

reven

330
4
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score 1 · Answer 2 · answered Jul 18 '22 at 14:53

1

You have to make sure that your API CORS policy exposes the header. See this question: Blazor WASM C# .NET 6 Content-Disposition is not Accessible

answered Jul 18 '22 at 14:53

Blue Eyed Behemoth

3,692
1
17
27

Using Blazor wasm I can't access content-disposition response header

2 Answers2