asp.net-web-api – 当请求具有不受支持的Content-Type时,如何配

发布时间：2020-12-16 06:22:25 所属栏目：asp.Net 来源：网络整理

导读：如果向我的Web API服务发出请求,该服务的Content-Type标头包含该服务不支持的类型,则会返回500 Internal Server Error状态代码,其中包含类似于以下内容的消息： {"Message":"An error has occurred.","ExceptionMessage":"No MediaTypeFormatter is availabl

如果向我的Web API服务发出请求,该服务的Content-Type标头包含该服务不支持的类型,则会返回500 Internal Server Error状态代码,其中包含类似于以下内容的消息：

{"Message":"An error has occurred.","ExceptionMessage":"No MediaTypeFormatter is available to read an object of type 'MyDto' from content with media type 'application/UnsupportedContentType'.","ExceptionType":"System.InvalidOperationException","StackTrace":" at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content,Type type,IEnumerable`1 formatters,IFormatterLogger formatterLogger)
   at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content,IFormatterLogger formatterLogger)
   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request,IFormatterLogger formatterLogger)
   at System.Web.Http.ModelBinding.FormatterParameterBinding.ExecuteBindingAsync(ModelMetadataProvider metadataProvider,HttpActionContext actionContext,CancellationToken cancellationToken)
   at System.Web.Http.Controllers.HttpActionBinding.<>c__DisplayClass1.<ExecuteBindingAsync>b__0(HttpParameterBinding parameterBinder)
   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.Threading.Tasks.TaskHelpers.IterateImpl(IEnumerator`1 enumerator,CancellationToken cancellationToken)"}

我宁愿按照建议返回415 Unsupported Media Type状态代码,例如here.

如何配置我的服务来执行此操作？

解决方法

这是我提出的解决这个问题的方法.

它广泛地基于描述的here,用于在没有可接受的响应内容类型时发送406 Not Acceptable状态代码.

public class UnsupportedMediaTypeConnegHandler : DelegatingHandler {
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,CancellationToken cancellationToken) {
        var contentType = request.Content.Headers.ContentType;
        var formatters = request.GetConfiguration().Formatters;
        var hasFormetterForContentType = formatters //
            .Any(formatter => formatter.SupportedMediaTypes.Contains(contentType));

        if (!hasFormetterForContentType) {
            return Task<HttpResponseMessage>.Factory //
                .StartNew(() => new HttpResponseMessage(HttpStatusCode.UnsupportedMediaType));
        }

        return base.SendAsync(request,cancellationToken);
    }
}

在设置服务配置时：

config.MessageHandlers.Add(new UnsupportedMediaTypeConnegHandler());

请注意,这要求char集也匹配.您可以通过仅检查标头的MediaType属性来放宽此限制.

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!