HTTP GET in VB.NET

Question

What is the best way to issue a http get in VB.net? I want to get the result of a request like http://api.hostip.info/?ip=68.180.206.184

Answer 1

You should try the HttpWebRequest class.

Answer 2

In VB.NET:

Dim webClient As System.Net.WebClient = New System.Net.WebClient()
Dim result As String = webClient.DownloadString("http://api.hostip.info/?ip=68.180.206.184")

In C#:

System.Net.WebClient webClient = new System.Net.WebClient();
string result = webClient.DownloadString("http://api.hostip.info/?ip=68.180.206.184");

Answer 3

use the webrequest class

this is to get an image

    Try
           Dim _WebRequest As System.Net.WebRequest = Nothing

_WebRequest = System.Net.WebRequest.Create(http://api.hostip.info/?ip=68.180.206.184)
            Catch ex As Exception
                    Windows.Forms.MessageBox.Show(ex.Message)
                    Exit Sub
                End Try
                Try
                    _NormalImage = Image.FromStream(_WebRequest.GetResponse().GetResponseStream())
                Catch ex As Exception
                    Windows.Forms.MessageBox.Show(ex.Message)
                    Exit Sub
                End Try

Answer 4

The easiest way is System.Net.WebClient.DownloadFile or DownloadString.

Answer 5

Try this:

WebRequest request = WebRequest.CreateDefault(RequestUrl);
request.Method = "GET";

WebResponse response;
try { response = request.GetResponse(); }
catch (WebException exc) { response = exc.Response; }

if (response == null)
    throw new HttpException((int)HttpStatusCode.NotFound, "The requested url could not be found.");

using(StreamReader reader = new StreamReader(response.GetResponseStream())) {
    string requestedText = reader.ReadToEnd();

    // do what you want with requestedText
}

Sorry about the C#, I know you asked for VB, but I didn't have time to convert.

Answer 6

You can use the HttpWebRequest class to perform a request and retrieve a response from a given URL. You'll use it like:

Try
    Dim fr As System.Net.HttpWebRequest
    Dim targetURI As New Uri("http://whatever.you.want.to.get/file.html")         

    fr = DirectCast(HttpWebRequest.Create(targetURI), System.Net.HttpWebRequest)
    If (fr.GetResponse().ContentLength > 0) Then
        Dim str As New System.IO.StreamReader(fr.GetResponse().GetResponseStream())
        Response.Write(str.ReadToEnd())
        str.Close(); 
    End If   
Catch ex As System.Net.WebException
   'Error in accessing the resource, handle it
End Try

HttpWebRequest is detailed at: http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx

A second option is to use the WebClient class, this provides an easier to use interface for downloading web resources but is not as flexible as HttpWebRequest:

Sub Main()
    'Address of URL
    Dim URL As String = http://whatever.com
    ' Get HTML data
    Dim client As WebClient = New WebClient()
    Dim data As Stream = client.OpenRead(URL)
    Dim reader As StreamReader = New StreamReader(data)
    Dim str As String = ""
    str = reader.ReadLine()
    Do While str.Length > 0
        Console.WriteLine(str)
        str = reader.ReadLine()
    Loop
End Sub

More info on the webclient can be found at: http://msdn.microsoft.com/en-us/library/system.net.webclient.aspx