我有一个Web应用程序,调用EWS Managed API连接到Office365。
我已经按照MSDN上的开始使用EWS Managed API 2.0客户端应用程序文档进行了操作。
在web.config
中,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;
}
以下方法摘自MSDN:
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;
}
}
我尝试把这一行注释掉:
//service.Url = new Uri("https://outlook.office365.com/ews/Exchange.asmx");
然后添加 Autodiscover:
service.AutodiscoverUrl(username);
设置代理或不设置,将该行注释:
Set the proxy or not, comment out the line:ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
但是看起来ExchangeService
直接调用服务器而不经过代理......我错了吗?
谢谢
Translated version:然而,似乎ExchangeService
直接调用了服务器而没有通过代理... 我漏掉了什么吗?
谢谢。
连接尝试失败,因为连接方在一段时间后没有正确响应,或者已建立的连接失败,因为连接的主机未能响应40.xxx.xx.x:443
。 - AlessandroExchangeService
中直接设置WebProxy
可以工作,但我没有尝试在web.config
中直接设置代理。谢谢...所以错误应该在pac文件中,但我仍然不明白为什么它可以在Chrome中工作。 - Alessandroproxyaddress
而不是scriptLocation
。请编辑您的答案,以便我可以接受它。 - Alessandro