基础连接已关闭；但在浏览器中有效

Question

我在 wifi 芯片上有一个简单的网络服务器运行（esp8266，在 nodeMCU 上用 LUA、运行编写）。当我在任何浏览器中查询网站时，我都会得到预期的响应并显示在浏览器中（大约 45 个字符长）。当我在 C# 或 powershell 中查询它时，我得到：

"The underlying connection was closed: The connection was closed unexpectedly."

我尝试了很多论坛建议的许多选项，但 none 似乎有效。

是否有任何方法可以像 IE 或 Chrome 一样发出 Web 请求？我不确定浏览器在内部执行了哪些额外步骤，以便他们能够毫无问题地获得响应？为什么这是 .NET 中的问题？

我的脚本如下。我正在考虑只使用 c# 来启动 PhantomJS（无头浏览器），然后使用 javascript 告诉它打开网站，然后传回响应。或者，使用套接字打开连接并以这种方式进行，而不是依赖 .NET 包装器。

# Set the useUnsafeHeaderParsing property to true
$netAssembly = [Reflection.Assembly]::GetAssembly([System.Net.Configuration.SettingsSection])
$bindingFlags = [Reflection.BindingFlags] "Static,GetProperty,NonPublic"
$settingsType = $netAssembly.GetType("System.Net.Configuration.SettingsSectionInternal")
$instance = $settingsType.InvokeMember("Section", $bindingFlags, $null, $null, @())
if($instance)
{
    $bindingFlags = "NonPublic","Instance"
    $useUnsafeHeaderParsingField = $settingsType.GetField("useUnsafeHeaderParsing", $bindingFlags)

    if($useUnsafeHeaderParsingField)
    {
        $useUnsafeHeaderParsingField.SetValue($instance, $true)
    }
}

# Try setting the certificate policy to a custom child class that always returns true
add-type @"
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
"@ 
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

# Try setting other attributes on the ServicePointManager class
[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls -bxor [System.Net.SecurityProtocolType]::Ssl3
[System.Net.ServicePointManager]::Expect100Continue = $false;

# Initiate the web request
$r = [System.Net.WebRequest]::Create("http://192.168.1.7/GetStatusAsJson")
# Try long timeouts, with KeepAlive set to false; Also try giving it a user agent string etc.
$r.Timeout = 5000
$r.ReadWriteTimeout = 5000
$r.KeepAlive = $false
$r.Method = "GET"
$r.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36";
$r.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
$resp = $r.GetResponse()

Answer 1

我最终使用了 MSXML2.XMLHTTP.3.0 和 vbscript，并从 powershell 执行了 vbscript。

on error resume next
Dim oXMLHTTP
Dim oStream

Set oXMLHTTP = CreateObject("MSXML2.XMLHTTP.3.0")
oXMLHTTP.Open "GET", WScript.Arguments.Item(2) & "/OpenDoor", False
oXMLHTTP.Send

If oXMLHTTP.Status = 200 Then
    Set oStream = CreateObject("ADODB.Stream")
    oStream.Open
    oStream.Type = 1
    oStream.Write oXMLHTTP.responseBody
    oStream.SaveToFile WScript.Arguments.Item(0) & "\OpenDoor.html"
    oStream.Close
End If

基础连接已关闭；但在浏览器中有效

The underlying connection was closed; but works in browsers

powershell

response

httpwebrequest

web