当尝试在外部Web服务(通过Internet)上调用方法时,它会抛出
“远程服务器返回错误:(407)需要代理身份验证。”
//Set the system proxy with valid server address or IP and port.
System.Net.WebProxy pry = new System.Net.WebProxy("MyHost", 8080);
//The DefaultCredentials automically get username and password.
pry.Credentials = System.Net.CredentialCache.DefaultCredentials;
System.Net.WebRequest.DefaultWebProxy = pry;