Question

我有一个外部Web服务以RESTful方式通过HTTP协议工作。它可以接受相当大的JSON文档（从1MB到20-30MB），进行一些转换并返回另一个大JSON文档，其大小等于或不小于接受的JSON文档的大小。

通过Postman进行测试时，效果很好。

我使用ASP.NET Core 2.2，并尝试使用HttpClient进行相同的请求。我的应用程序接受数据，创建相同的JSON文档，然后将其发送到外部Web服务。

这是我使用的代码：

public async Task<TResponse> MakeRequest<TRequest, TResponse>(TRequest request)
{
        if (request == null)
            throw new ArgumentNullException(nameof(TRequest));

        var content = new StringContent(JsonConvert.SerializeObject(request));
        content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        var httpRequestMessage = new HttpRequestMessage { Method = HttpMethod.Post, Content = content };

        var response = await _httpClient.SendAsync(httpRequestMessage);

        if (response.IsSuccessStatusCode)
        {
            string responseString = await response.Content.ReadAsStringAsync();
            var responseObject = JsonConvert.DeserializeObject<TResponse>(responseString);
            return (responseObject != null) ? responseObject : throw new InvalidOperationException();
        }
        throw new InvalidOperationException();
}

当JSON文档的大小较小时，效果很好-适用于4KB文档，适用于20KB文档，适用于200KB文档，但是从大约800KB文档开始，它会抛出System.Net.Http.HttpRequestException System.IOException仅显示消息服务器返回了无效或无法识别的响应。。

它在第var response = await _httpClient.SendAsync(httpRequestMessage);行上失败。

我尝试手动创建HttpClient对象或通过IServiceCollection注入HttpClient对象-同样的行为。

services.AddHttpClient<IExternalWebServiceProxy, ExternalWebServiceProxy>()
            .ConfigureHttpClient(x =>
            {
                x.MaxResponseContentBufferSize = 1024 * 1000 * 100;
            });

有什么想法会导致问题吗？

更新-exception.ToString（）消息：

System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.IO.IOException: The server returned an invalid or unrecognized response.
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at XXX.XXX.XXX.Internals.NCANodeProxy.MakeRequest[TRequest,TResponse](TRequest request) in D:\Sources\XXX\XXX\XXX.XXX.Core\Internals\ExternalNodeProxy.cs:line 36
   at XXX.XXX.XXX.Services.CryptoService.SignFileDocument(SignFileCommand command) in D:\Sources\XXX\XXX\XXX.XXX.Core\Services\CryptoService.cs:line 134

发送大型JSON文件（> 1 MB）时抛出HttpClient.SendAsync引发System.Net.Http.HttpRequestException

0 个答案: