上传转换为 base64 的 pdf 时返回内部服务器错误代码并使用 json ASP.NET MVC 发布

如何解决上传转换为 base64 的 pdf 时返回内部服务器错误代码并使用 json ASP.NET MVC 发布

我正在尝试使用 ASP.NET MVC 5 创建一个 api，该 api 上传转换为 base64 的 pdf，但返回 StatusCode：500 内部服务器错误。 base64 的长度为 926,215 个字符。 这是我的控制器：

using Newtonsoft.Json;
using System;
using System.Web;
using System.Web.Mvc;
using System.IO;
using System.Configuration;
using System.Net.Http.Headers;

    [HttpPost]
    public ActionResult PDFUpload(PDFDetails rd)
    {
        if (ModelState.IsValid)
        {
            if (rd.File != null && rd.File.ContentLength > 0 && rd.File.ContentType == "application/pdf")
            {
                using (var client = new HttpClient())
                {
                    //http://ptsv2.com/t/syaz0-1615714235/post
                    client.BaseAddress = new Uri(ConfigurationManager.AppSettings["TestUrl"]);
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                    var fileString = new
                    {
                        file = new
                        {
                            mime = rd.File.ContentType,data = "base64-data=" + ToBase64(rd.File)
                        }
                    };
                    var json = JsonConvert.SerializeObject(fileString);
                    var postTask = client.PostAsJsonAsync("post",json);
                    postTask.Wait();
                    if (postTask.IsCompleted)
                    {
                        Console.WriteLine("complete");
                    }
               }
            }
        }
        return RedirectToAction("SubmitDetails");
    }

这是我将文件转换为 base64 的方法

    public static String ToBase64(HttpPostedFileBase cv)
    {
        byte[] fileInBytes = new byte[cv.ContentLength];
        using (BinaryReader theReader = new BinaryReader(cv.InputStream))
        {
            fileInBytes = theReader.ReadBytes(cv.ContentLength);
        }
        string fileAsString = Convert.ToBase64String(fileInBytes);
        return fileAsString;
    }

我的课

public class PDFDetails
{
    public HttpPostedFileBase File { get; set; }
}

当我只删除 base64 编码的字符串时它就起作用了。所以我尝试增加请求并添加超时但仍然有相同的错误。

 <appSettings>
<add key="webpages:Version" value="3.0.0.0"/>
<add key="webpages:Enabled" value="false"/>
<add key="ClientValidationEnabled" value="true"/>
<add key="UnobtrusiveJavaScriptEnabled" value="true"/>
<add key="TestUrl" value="http://ptsv2.com/t/syaz0-1615714235/"/>
</appSettings>


<system.web>
<compilation debug="true" targetFramework="4.5"/>
<httpRuntime targetFramework="4.5" maxRequestLength="2147483647" executionTimeout="1600" requestLengthDiskThreshold="2147483647"/>
<httpModules>
  <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule,Microsoft.AI.Web"/>
</httpModules>
</system.web>
<system.webServer>
<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>
  <modules>
  <remove name="TelemetryCorrelationHttpModule"/>
  <add name="TelemetryCorrelationHttpModule" type="Microsoft.AspNet.TelemetryCorrelation.TelemetryCorrelationHttpModule,Microsoft.AspNet.TelemetryCorrelation" preCondition="integratedMode,managedHandler"/>
  <remove name="ApplicationInsightsWebTracking"/>
  <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule,Microsoft.AI.Web" preCondition="managedHandler"/>
</modules>
<validation validateIntegratedModeConfiguration="false"/>
<security>
  <requestFiltering>
    <!-- This will handle requests up to 1024MB (1GB) -->
    <requestLimits maxAllowedContentLength="1048576000"/>
  </requestFiltering>
</security>
</system.webServer>