我正在访问Rackspace Cloud API。
我有一个api电话，它在架空云上验证我。
该方法运行良好，但是，我不时会得到这个例外，随机：
The remote name could not be resolved: 'identity.api.rackspacecloud.com'
当我没有得到此异常时，该方法返回预期的结果，应该是。
为什么会这样做有什么具体原因？
这是我的.net代码：
private async Task<XDocument> AuthenticateAsync()
{
XNamespace ns = "http://docs.rackspace.com/identity/api/ext/RAX-KSKEY/v1.0";
XDocument doc =
new XDocument(
new XDeclaration("1.0", "UTF-8", "Yes"),
new XElement("auth",
new XElement(ns + "apiKeyCredentials",
new XAttribute("username", "the userName"),
new XAttribute("apiKey", "the apiKey")
)
)
);
using (HttpClient client = new HttpClient())
{
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));
StringContent content = new StringContent(doc.ToString(), Encoding.UTF8, "application/xml");
// i randomly get "The remote name could not be resolved" exception
HttpResponseMessage response = await client.PostAsync("https://identity.api.rackspacecloud.com/v2.0/tokens", content);
response.EnsureSuccessStatusCode();
string stringResponse = await response.Content.ReadAsStringAsync();
return XDocument.Parse(stringResponse);
}
}