[英]Using Proxy PAC with EWS API
我有一个Web应用程序,该应用程序调用EWS托管API连接到office365。
我遵循了MSDN上的EWS Managed API 2.0客户端应用程序入门文档。
在web.config
我指定了代理pac:
<configuration>
<system.net>
<defaultProxy useDefaultCredentials="false">
<proxy autoDetect="False" bypassonlocal="True" scriptLocation="http://example.com:8080/proxy.pac" usesystemdefault="False" />
</defaultProxy>
</system.net>
[...]
</configuration>
我尝试通过以下方式连接到Exchange:
public static ExchangeService getExchangeService(String username)
{
ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);
service.Credentials = new WebCredentials(USER_365, PWD_365, DOMAIN_365);
service.UseDefaultCredentials = true;
//I've tried both WebProxy settings, this:
service.WebProxy = WebRequest.GetSystemWebProxy();
//And this (with no success):
//service.WebProxy = WebRequest.DefaultWebProxy;
//I've also tried Autodiscover...
service.AutodiscoverUrl(USER_365, RedirectionUrlValidationCallback);
//...and direct url
//service.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, username);
return service;
}
以下是从MSDN复制和粘贴的方法:
private static bool RedirectionUrlValidationCallback(string redirectionUrl)
{
// The default for the validation callback is to reject the URL.
bool result = false;
Uri redirectionUri = new Uri(redirectionUrl);
// Validate the contents of the redirection URL. In this simple validation
// callback, the redirection URL is considered valid if it is using HTTPS
// to encrypt the authentication credentials.
if (redirectionUri.Scheme == "https")
{
result = true;
}
return result;
}
private static bool CertificateValidationCallBack(object sender,
System.Security.Cryptography.X509Certificates.X509Certificate certificate,
System.Security.Cryptography.X509Certificates.X509Chain chain,
System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
// If the certificate is a valid, signed certificate, return true.
if (sslPolicyErrors == System.Net.Security.SslPolicyErrors.None)
{
return true;
}
// If there are errors in the certificate chain, look at each error to determine the cause.
if ((sslPolicyErrors & System.Net.Security.SslPolicyErrors.RemoteCertificateChainErrors) != 0)
{
if (chain != null && chain.ChainStatus != null)
{
foreach (System.Security.Cryptography.X509Certificates.X509ChainStatus status in chain.ChainStatus)
{
if ((certificate.Subject == certificate.Issuer) &&
(status.Status == System.Security.Cryptography.X509Certificates.X509ChainStatusFlags.UntrustedRoot))
{
// Self-signed certificates with an untrusted root are valid.
continue;
}
else
{
if (status.Status != System.Security.Cryptography.X509Certificates.X509ChainStatusFlags.NoError)
{
// If there are any other errors in the certificate chain, the certificate is invalid,
// so the method returns false.
return false;
}
}
}
}
// When processing reaches this line, the only errors in the certificate chain are
// untrusted root errors for self-signed certificates. These certificates are valid
// for default Exchange server installations, so return true.
return true;
}
else
{
// In all other cases, return false.
return false;
}
}
我试图注释掉这一行:
//service.Url = new Uri("https://outlook.office365.com/ews/Exchange.asmx");
并添加自动发现:
service.AutodiscoverUrl(username);
是否设置代理,将以下行注释掉:
ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
但是,似乎ExchangeService
无需通过代理即可直接调用服务器……我缺少什么?
谢谢
尝试从web.config中的代理配置中完全删除bypassonlocal属性。 将此属性与scriptLocation一起设置存在问题。
有关更多信息: https : //blogs.msdn.microsoft.com/rickrain/2011/03/25/why-scriptlocation-may-not-work-when-pointing-to-a-proxy-script-file-in-您的应用程序配置文件/
另外,web.config默认代理配置也应足够,因此您可以在代码中删除任何代理设置。
也许就是这种情况。
更新 :在proxyaddress
指定pac脚本位置而不是在web.config中指定scriptLocation
属性可以解决此问题。
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