如何从ASP.NET Core MVC响应的Content-Type中删除字符集? [英] How do I remove the charset from Content-Type in a ASP.NET Core MVC response?

问题描述

无论我尝试什么，我似乎都无法从响应的Content-Type标头中删除; charset=utf-8部分.

No matter what I try I cannot seem to remove the ; charset=utf-8 part from my response's Content-Type header.

[HttpGet("~/appid")]
// Doesn't work
//[Produces("application/fido.trusted-apps+json")]
public string GetAppId()
{
    // Doesn't work
    Response.ContentType = "application/fido.trusted-apps+json";

    // Doesn't work
    //Response.ContentType = null;
    //Response.Headers.Add("Content-Type", "application/fido.trusted-apps+json");

    return JsonConvert.SerializeObject(new
    {
        foo = true
    });
}

我只想要application/fido.trusted-apps+json时总是得到application/fido.trusted-apps+json; charset=utf-8.

注意:这符合

Note: This is to conform with the FIDO AppID and Facet Specification v1.0 for U2F which states:

响应必须将MIME内容类型设置为"application/fido.trusted-apps + json".

The response must set a MIME Content-Type of "application/fido.trusted-apps+json".

推荐答案

我采用了以下方法，在中间出路时使用中间件替换标头.看起来有点黑，必须使用这样的中间件:

I went with the following approach, using middleware to replace the header on the way out. Seems kinda hacky to have to use middleware like this:

public class AdjustHeadersMiddleware
{
    private readonly RequestDelegate _next;

    public AdjustHeadersMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext httpContext, CurrentContext currentContext)
    {
        httpContext.Response.OnStarting((state) =>
        {
            if(httpContext.Response.Headers.Count > 0 && httpContext.Response.Headers.ContainsKey("Content-Type"))
            {
                var contentType = httpContext.Response.Headers["Content-Type"].ToString();
                if(contentType.StartsWith("application/fido.trusted-apps+json"))
                {
                    httpContext.Response.Headers.Remove("Content-Type");
                    httpContext.Response.Headers.Append("Content-Type", "application/fido.trusted-apps+json");
                }
            }

            return Task.FromResult(0);
        }, null);


        await _next.Invoke(httpContext);
    }
}

Startup.cs Configure()

app.UseMiddleware<AdjustHeadersMiddleware>();

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