ASP.Net/Network/HttpWebRequest

Материал из .Net Framework эксперт
Версия от 11:54, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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Header of HttpWebRequest

<%@ Page %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<script language="C#" runat="server">
private void SubmitButton_Click(System.Object sender, System.EventArgs e){
  String RequestUrl = "http://www.ebay.ru";
  HttpWebRequest webRequestObject = null;
  StreamReader sr = null;
  HttpWebResponse webResponseObject = null;
  
  try{
    webRequestObject = (HttpWebRequest) WebRequest.Create(RequestUrl);
    webRequestObject.Method = "GET";
    
    webResponseObject = (HttpWebResponse) webRequestObject.GetResponse();
    
    int i;
    HeadersText.Text = "";
    for(i=0; i < webResponseObject.Headers.Count; i++){
      HeadersText.Text += Environment.NewLine + "Header Name: " + webResponseObject.Headers.Keys[i] + "   Value :" + webResponseObject.Headers[i];
    }
    
    CookieCollection myCookieCollection = webResponseObject.Cookies;
    for(i=0; i < myCookieCollection.Count; i++){
      HeadersText.Text += Environment.NewLine + "Cookie Name: " + myCookieCollection[i].Name + "   Value= " + myCookieCollection[i].Value;
    }
    sr = new StreamReader(webResponseObject.GetResponseStream());
    
    String Results = sr.ReadToEnd();
    WebResponseLabel.Text = Results;
    WebResponseText.Text = Results;
  }
  finally{
    try{
      sr.Close();
      webResponseObject.Close();
      webRequestObject.Abort();
    }
    catch{}
  }
}
</script>
<html>
  <head>
    <title></title>
  </head>
  <body>
    <form runat="server" ID="Form1">
      <asp:Button Runat="server" ID="SubmitButton" Text="Get Headers and Cookies" OnClick="SubmitButton_Click" /><br>
      <asp:TextBox Runat="server" id="HeadersText" Width="780" Height="300" TextMode="MultiLine" /><br>
      <asp:TextBox Runat="server" id="WebResponseText" Width="780" Height="300" TextMode="MultiLine" /><br>
      <asp:Label Runat="server" ID="WebResponseLabel" />
    </form>
  </body>
</html>



HttpWebRequest AllowAutoRedirect

<%@ Page %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<script language="C#" runat="server">
private void SubmitButton_Click(System.Object sender, System.EventArgs e){
  String RequestUrl = Request.Url.GetLeftPart(System.UriPartial.Authority) + Request.ApplicationPath + "/NextPage.aspx";
  HttpWebRequest webRequestObject = null;
  StreamReader sr = null;
  HttpWebResponse webResponseObject = null;
  
  try{
    webRequestObject = (HttpWebRequest) WebRequest.Create(RequestUrl);
    webRequestObject.Method = "GET";
    
    webRequestObject.AllowAutoRedirect = false;
    webResponseObject = (HttpWebResponse) webRequestObject.GetResponse();
    sr = new StreamReader(webResponseObject.GetResponseStream());
    
    String Results = sr.ReadToEnd();
    WebResponseLabel.Text = Results;
    WebResponseText.Text = Results;
  }
  finally{
    try{
      sr.Close();
      webResponseObject.Close();
      webRequestObject.Abort();
    }
    catch{}
  }
}
</script>
<html>
  <head>
    <title></title>
  </head>
  <body>
    <form runat="server" ID="Form1">
      <asp:Button Runat="server" ID="SubmitButton" Text="Get Redirecting Page" OnClick="SubmitButton_Click" /><br>
      <asp:TextBox Runat="server" id="WebResponseText" Width="780" Height="300" TextMode="MultiLine" /><br>
      <asp:Label Runat="server" ID="WebResponseLabel" />
    </form>
  </body>
</html>
File: NextPage.aspx
<%@ Page EnableViewstate="False" %>
<script language="VB" runat="server">
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
  Response.Redirect("http://nfex.ru")
End Sub
</script>



Read Cookie value from HttpWebRequest

<%@ Page %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<script language="C#" runat="server">
private void SubmitButton_Click(System.Object sender, System.EventArgs e){
  String RequestUrl = Request.Url.GetLeftPart(System.UriPartial.Authority) + Request.ApplicationPath + "/NextPage.aspx";
  HttpWebRequest webRequestObject = null;
  StreamReader sr = null;
  HttpWebResponse webResponseObject = null;
  
  try{
    webRequestObject = (HttpWebRequest) WebRequest.Create(RequestUrl);
    webRequestObject.Method = "GET";
    
    System.Net.CookieContainer CookieContainerObject = new System.Net.CookieContainer();
    System.Net.Cookie Cookie = new System.Net.Cookie();
    Cookie.Name = "userid";
    Cookie.Value = "1234567890";
    Cookie.Domain = Request.ServerVariables["HTTP_HOST"];
    Cookie.Secure = true;
    CookieContainerObject.Add(Cookie);
    webRequestObject.CookieContainer = CookieContainerObject;
    webResponseObject = (HttpWebResponse) webRequestObject.GetResponse();
    sr = new StreamReader(webResponseObject.GetResponseStream());
    
    String Results = sr.ReadToEnd();
    WebResponseLabel.Text = Results;
    WebResponseText.Text = Results;
  }
  finally{
    try{
      sr.Close();
      webResponseObject.Close();
      webRequestObject.Abort();
    }
    catch{}
  }
}
</script>
<html>
  <head>
    <title></title>
  </head>
  <body>
    <form runat="server" ID="Form1">
      <asp:Button Runat="server" ID="SubmitButton" Text="Get Page Requiring Cookies" OnClick="SubmitButton_Click" />
      <a href="NextPage.aspx">View Page without Cookie</a><br>
      <asp:TextBox Runat="server" id="WebResponseText" Width="780" Height="300" TextMode="MultiLine" /><br>
      <asp:Label Runat="server" ID="WebResponseLabel" />
    </form>
  </body>
</html>
File: NextPage.aspx
<%@ Page EnableViewstate="False" %>
<%@ Import Namespace="System.Net" %>
<script language="VB" runat="server">
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
  Dim MyCookie as HttpCookie = Request.Cookies("userid")
  
  If MyCookie is nothing then
    Label.Text = "You need cookies turned on to view this page."
  Else
    Label.Text = "Thank you for turning on cookies. Your userid is: " & MyCookie.Value
  End If
End Sub
</script>
<html>
  <body>
    <form runat="server">
      <asp:Label Runat="server" ID="Label" />
    </form>
  </body>
</html>



Read Stream from HttpWebRequest

<%@ Page %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<script language="C#" runat="server">
private void SubmitButton_Click(System.Object sender, System.EventArgs e){
  String RequestUrl = UrlTextbox.Text;
  
  HttpWebRequest webRequestObject = null;
  StreamReader sr = null;
  HttpWebResponse webResponseObject = null;
  
  try{
    webRequestObject = (HttpWebRequest) WebRequest.Create(RequestUrl);
    webRequestObject.Method = "GET";
    webResponseObject = (HttpWebResponse) webRequestObject.GetResponse();
    sr = new StreamReader(webResponseObject.GetResponseStream());
    
    String Results = sr.ReadToEnd();
    WebResponseLabel.Text = Results;
    WebResponseText.Text = Results;
  }
  finally{
    try{
      sr.Close();
      webResponseObject.Close();
      webRequestObject.Abort();
    }
    catch{}
  }
}
</script>
<html>
  <head>
    <title></title>
  </head>
  <body>
    <form runat="server" ID="Form1">
      <asp:TextBox Runat="server" id="UrlTextbox" Text="http://www.nfex.ru" />
      <asp:Button Runat="server" ID="SubmitButton" Text="Get Page" OnClick="SubmitButton_Click" /><br>
      <asp:TextBox Runat="server" id="WebResponseText" Width="780" Height="300" TextMode="MultiLine" />
      <asp:Label Runat="server" ID="WebResponseLabel" />
    </form>
  </body>
</html>



Search Amazon

<%@ Page %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<script language="C#" runat="server">
private void SubmitButton_Click(System.Object sender, System.EventArgs e){
  String RequestUrl = "http://www.amazon.ru/exec/obidos/search-handle-form";
  String Post = "field-keywords=" + SearchText.Text;
  StreamWriter Writer = null;
  HttpWebRequest webRequestObject = null;
  StreamReader sr = null;
  HttpWebResponse webResponseObject = null;
  
  try{
    webRequestObject = (HttpWebRequest) WebRequest.Create(RequestUrl);
    webRequestObject.Method = "POST";
    webRequestObject.ContentType = "application/x-www-form-urlencoded";
    webRequestObject.ContentLength = Post.Length;
    Writer = new StreamWriter(webRequestObject.GetRequestStream());
    Writer.Write(Post);
    Writer.Close();
    webResponseObject = (HttpWebResponse) webRequestObject.GetResponse();
    sr = new StreamReader(webResponseObject.GetResponseStream());
    
    String Results = sr.ReadToEnd();
    WebResponseLabel.Text = Results;
    WebResponseText.Text = Results;
  }
  finally{
    try{
      sr.Close();
      webResponseObject.Close();
      webRequestObject.Abort();
    }
    catch{}
  }
}
</script>
<html>
  <head>
    <title></title>
  </head>
  <body>
    <form runat="server" ID="Form1">
      Search Amazon for:
      <asp:TextBox Runat="server" ID="SearchText" Text="Java" />
      <asp:Button Runat="server" ID="SubmitButton" Text="Get Amazon.ru Search Results" OnClick="SubmitButton_Click" /><br>
      <asp:TextBox Runat="server" id="WebResponseText" Width="780" Height="300" TextMode="MultiLine" />
      <asp:Label Runat="server" ID="WebResponseLabel" />
    </form>
  </body>
</html>



Set UserAgent for HttpWebRequest

<%@ Page %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<script language="C#" runat="server">
private void SubmitButton_Click(System.Object sender, System.EventArgs e){
  String RequestUrl = Request.Url.GetLeftPart(System.UriPartial.Authority) + Request.ApplicationPath + "/Default.aspx";
  HttpWebRequest webRequestObject = null;
  StreamReader sr = null;
  HttpWebResponse webResponseObject = null;
  
  try{
    webRequestObject = (HttpWebRequest) WebRequest.Create(RequestUrl);
    webRequestObject.Method = "GET";
    
    webRequestObject.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)";
    webResponseObject = (HttpWebResponse) webRequestObject.GetResponse();
    sr = new StreamReader(webResponseObject.GetResponseStream());
    
    String Results = sr.ReadToEnd();
    WebResponseLabel.Text = Results;
    WebResponseText.Text = Results;
  }
  finally{
    try{
      sr.Close();
      webResponseObject.Close();
      webRequestObject.Abort();
    }
    catch{}
  }
}
</script>
<html>
  <head>
    <title></title>
  </head>
  <body>
    <form runat="server" ID="Form1">
      <asp:Button Runat="server" ID="SubmitButton" Text="Get Page Requiring Specific Browser Settings" OnClick="SubmitButton_Click" /><br>
      <asp:TextBox Runat="server" id="WebResponseText" Width="780" Height="300" TextMode="MultiLine" /><br>
      <asp:Label Runat="server" ID="WebResponseLabel" />
    </form>
  </body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Network/HttpWebRequest&oldid=2474»