c# - 尝试使用 HttpClient 上传文件时来自 Web Api 的 RequestEntityTooLarge 响应

Question

我正在尝试创建一个 Web 服务以使用 Asp.Net Web Api 通过 Post 上传文件。这些分别是 Client 和 Web Api 的实现:

客户:

using (var client = new HttpClient()) {
    client.BaseAddress = new Uri("https://127.0.0.1:44444/");
    using (var content =
       new MultipartFormDataContent("Upload----" + DateTime.Now.ToString(CultureInfo.InvariantCulture))) {
       content.Add(new ByteArrayContent(File.ReadAllBytes(filepath)));
       content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
       var response = await client.PostAsync("api/Synchronization", content);

       if (response.IsSuccessStatusCode)
           eventLog1.WriteEntry("Synchronization has been successful", EventLogEntryType.Information);
       else 
           eventLog1.WriteEntry(response.StatusCode + ":" + response.ReasonPhrase, EventLogEntryType.Error);

      }
}

服务器:

public class SynchronizationController : ApiController {

    public HttpResponseMessage SynchronizeCsv() {
        var task = this.Request.Content.ReadAsStreamAsync();
        task.Wait();
        Stream requestStream = task.Result;

        try {
            Stream fileStream = File.Create(HttpContext.Current.Server.MapPath(path));
            requestStream.CopyTo(fileStream);
            fileStream.Close();
            requestStream.Close();
        }
        catch (IOException) {
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "A generic error occured. Please try again later.");
        }

        HttpResponseMessage response = new HttpResponseMessage();
        response.StatusCode = HttpStatusCode.Created;
        return response;
    }
}

网络配置:

<system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" maxRequestLength="2097152" />
  </system.web>
  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2147483648" />
      </requestFiltering>
    </security>
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>

我正在尝试上传一个 5Mb 的文件，每次尝试调用该服务时，我都会收到 413 Http 错误请求实体太大。如果文件很小(例如 40kb)，一切正常。

通过互联网查看我尝试对 web.config 进行一些修改，但似乎没有任何工作正常。我做错了什么？

Answer 1

我通过这个解决方案解决了这个问题:http://www.smartdigitizers.com/net-development-tips/iis-7-how-to-resolve-error-https-413-request-entity-too-large/

1. 启动“Internet 信息服务 (IIS) 管理器”
2. 选择您在其下托管网络应用程序的网站。
3. 在功能部分，双击“配置编辑器”
4. 在“部分”下选择:system.webServer 然后是 serverRuntime
5. 将“uploadReadAheadSize”部分修改为 20MB(以字节为单位的值)
6. 点击应用