[英]How do I remove the charset from Content-Type in a ASP.NET Core MVC response?
无论我尝试什么,我似乎都无法删除; charset=utf-8
来自我的响应的Content-Type
标头的; charset=utf-8
部分。
[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
});
}
我总是得到application/fido.trusted-apps+json; charset=utf-8
当我只想要application/fido.trusted-apps+json
时, application/fido.trusted-apps+json; charset=utf-8
。
注意:这符合U2F的FIDO AppID和Facet规范v1.0的规定:
响应必须将MIME内容类型设置为“ application / fido.trusted-apps + json”。
我采用以下方法,使用中间件替换输出头。 看起来有点黑,必须使用这样的中间件:
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);
}
}
app.UseMiddleware<AdjustHeadersMiddleware>();
如果请求您的MVC端点的系统发送了正确的Accept: application/fido.trusted-apps+json
,那么我相信您正在寻找自定义格式器。
看到:
看起来像这样(从第二个链接借来的):
public class FidoTrustedAppOutputFormatter : IOutputFormatter
{
public FidoTrustedAppOutputFormatter
{
SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/fido.trusted-apps+json"));
}
public bool CanWriteResult(OutputFormatterCanWriteContext context)
{
if (context == null) throw new ArgumentNullException(nameof(context));
if (context.ContentType == null || context.ContentType.ToString() == "application/fido.trusted-apps+json")
return true;
return false;
}
public async Task WriteAsync(OutputFormatterWriteContext context)
{
if (context == null) throw new ArgumentNullException(nameof(context));
var response = context.HttpContext.Response; response.ContentType = "application/fido.trusted-apps+json";
using (var writer = context.WriterFactory(response.Body, Encoding.UTF8))
{
// replace with Json.net implementation
Jil.JSON.Serialize(context.Object, writer);
await writer.FlushAsync();
}
}
}
public class FidoTrustedAppInputFormatter : IInputFormatter
{
public FidoTrustedAppInputFormatter
{
SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/fido.trusted-apps+json"));
}
public bool CanRead(OutputFormatterCanWriteContext context)
{
if (context == null) throw new ArgumentNullException(nameof(context));
if (context.ContentType == null || context.ContentType.ToString() == "application/fido.trusted-apps+json")
return true;
return false;
}
public Task<InputFormatterResult> ReadAsync(InputFormatterContext context)
{
if (context == null) throw new ArgumentNullException(nameof(context));
var request = context.HttpContext.Request; if (request.ContentLength == 0)
{
if (context.ModelType.GetTypeInfo().IsValueType)
return InputFormatterResult.SuccessAsync(Activator.CreateInstance(context.ModelType));
else return InputFormatterResult.SuccessAsync(null);
}
var encoding = Encoding.UTF8;//do we need to get this from the request im not sure yet
using (var reader = new StreamReader(context.HttpContext.Request.Body))
{
var model = Jil.JSON.Deserialize(reader, context.ModelType);
return InputFormatterResult.SuccessAsync(model);
}
}
}
然后在您的启动中注册它:
services.AddMvcCore(options =>
{
options.InputFormatters.Insert(0, new FidoTrustedAppInputFormatter ());
options.OutputFormatters.Insert(0, new FidoTrustedAppOutputFormatter ());
});
我发现您可以使用ContentResult在控制器中覆盖它。 因此,您可以通过执行以下示例来实现所需的功能
string bodyJson = JsonConvert.SerializeObject(new
{
foo = true
})
var response = new ContentResult()
{
Content = bodyJson,
ContentType = "application/fido.trusted-apps+json",
StatusCode = (int)System.Net.HttpStatusCode.OK,
};
return response;
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