再谈HTTP Post XML数据

之前写过一篇HTTPPost的文章/article/4980457.html

这篇文章的代码其实是有点问题的：第一次提交数据会不通过，然后再试的话都是没有问题的，一直不解，直到今天在MSDN上发现了解决方案，贴出代码如下：

protected string HttpPostData(string URL, string strParm, int outTime)
{
StringBuilder str = new StringBuilder();
try
{
HttpWebRequest WRequest;
HttpWebResponse WResponse = null;
HttpWebResponse response = null;
//preAuth the request
// You can add logic so that you only pre-authenticate the very first request.
// You should not have to pre-authenticate each request.
Uri uri = new Uri(URL);
WRequest = (HttpWebRequest)HttpWebRequest.Create(uri);
WRequest.Credentials = new NetworkCredential("wcadmin", "wcadmin");
WRequest.PreAuthenticate = true;
WRequest.UserAgent = "Upload PLM XML";
WRequest.Method = "HEAD";
WRequest.Timeout = outTime;
WResponse = (HttpWebResponse)WRequest.GetResponse();
WResponse.Close();
// Make the real request.
WRequest = (HttpWebRequest)HttpWebRequest.Create(URL);
WRequest.Credentials = new NetworkCredential("wcadmin", "wcadmin");
WRequest.PreAuthenticate = true;
WRequest.UserAgent = "Upload PLM XML";
WRequest.Method = "POST";
WRequest.AllowWriteStreamBuffering = false;
WRequest.Timeout = 10000;
Byte[] postBytes = Encoding.UTF8.GetBytes(strParm);
WRequest.ContentLength = postBytes.Length;
Stream requestStream = WRequest.GetRequestStream();
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();
try
{
response = (HttpWebResponse)WRequest.GetResponse();
}
catch (WebException e)
{
response = (HttpWebResponse)e.Response;
}
Stream responseStream = response.GetResponseStream();
StreamReader streamReader = new StreamReader(responseStream, Encoding.Default);
while (streamReader.Peek() != -1)
{
str.Append(streamReader.ReadLine());
}
streamReader.Close();
response.Close();
WResponse.Close();
}
catch (Exception error)
{
str.AppendLine(error.Message);
}
return str.ToString();
}

注意英文注释的那一段，通过这个方法即可成功提交数据，不会遇到莫名的400错误了。

如果上面还是遇到问题，请参考下面的代码

/article/5036168.html

要在发送请求的时候添加HTTP Basic Authentication认证信息到请求中，有两种方法：

一是在请求头中添加Authorization：
Authorization: "Basic 用户名和密码的base64加密字符串"

二是在url中添加用户名和密码： http://userName:password@api.minicloud.com.cn/statuses/friends_timeline.xml
下面来看下对于第一种在请求中添加Authorization头部的各种语言的实现代码。

先看.NET的吧：

string username="username";
string password="password";
//注意这里的格式哦，为 "username:password"
string usernamePassword = username + ":" + password;
CredentialCache mycache = new CredentialCache();
mycache.Add(new Uri(url), "Basic", new NetworkCredential(username, password));
myReq.Credentials = mycache;
myReq.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(usernamePassword)));

WebResponse wr = myReq.GetResponse();
Stream receiveStream = wr.GetResponseStream();
StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);
string content = reader.ReadToEnd();

　　

你当然也可以使用HttpWebRequest或者其他的类来发送请求。