我必须获得一个学校项目的~1000个网站的源代码。我在for循环中使用HTTP Webrequest。但是我列表中超过半数网站返回404错误,因此无法找到该网站。当我在Chrome,Firefox或Internet Explorer上浏览此网站时,一切正常。
继承我的代码以获取源代码:
public string getSource(string url){
string urlAddress = url;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlAddress);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK)
{
Stream receiveStream = response.GetResponseStream();
StreamReader readStream = null;
if (response.CharacterSet == null)
{
readStream = new StreamReader(receiveStream);
}
else
{
readStream = new StreamReader(receiveStream, Encoding.GetEncoding(response.CharacterSet));
}
data = readStream.ReadToEnd();
response.Close();
readStream.Close();
}
return data;
}
由于1000个网站的质量,它可能无效吗?
答案 0 :(得分:0)
您可能必须将用户代理设置为许多网站的已知浏览器,因为它们会拒绝来自未知浏览器的请求。请在致电request.GetResponse
之前尝试此操作var agent = "Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)";
request.Headers.Add("user-agent", agent);