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Home » Internet and Web » Download Files using HTTP and Proxy Server in VB.NET

Download Files using HTTP and Proxy Server in VB.NET

This article describes how to download a File using HTTP and Proxy Server in VB.NET.

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Technologies: .NET 1.0/1.1,Visual Basic .NET
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One user at C# Corner asked me a question, how to download files using HTTP by passing Proxy server. This article explains how to pass proxy server network credentials when downloading files using HTTP.

Passing Network Credentials.

If your company is using proxy server to connect to the Internet, you will have to pass proxy settings to download files from the Internet using HTTP. To do so, you need to create a WebProxy instance, and set its Credentials property, which is NetworkCredential and takes userId, password, and network domain.

Here is the code that uses network credentials:

Dim result As String = ""
Try
Dim proxy As New WebProxy(""http://proxy:80/"", True
)
proxy.Credentials =
New
NetworkCredential("userId", "password", "Domain")
Dim request As
WebRequest = WebRequest.Create("http://www.c-sharpcorner.com")
request.Proxy = proxy
' Send the 'HttpWebRequest' and wait for response.
Dim response As HttpWebResponse = CType
(request.GetResponse(), HttpWebResponse)
Dim stream As
System.IO.Stream = response.GetResponseStream()
Dim ec As
System.Text.Encoding = System.Text.Encoding.GetEncoding("utf-8")
Dim reader As New
System.IO.StreamReader(stream, ec)
Dim chars() As Char = New
[Char](256)
{}
Dim count As Integer
= reader.Read(chars, 0, 256)
While
count > 0
Dim str = New
[String](chars, 0, 256)
result = result + str
count = reader.Read(chars, 0, 256)
End
While
response.Close()
stream.Close()
reader.Close()
Catch exp As
Exception
Dim str As String
= exp.Message
End
Try


Using HTTPS with WebProxy Class.

When you create a WebProxy class instance for a proxy server to pass proxy to download files from the Internet using HTTP, code looks like this:

WebProxy proxy = new WebProxy(""http://proxy:80/"", true);

However, this code will not work when you want to download a file from HTTPS. You need to use the following code to create a WebProxy instance for HTTPS:

WebProxy myProxy = new WebProxy("server.https.com", 443);

 

NOTE: THIS ARTICLE IS CONVERTED FROM C# TO VB.NET USING A CONVERSION TOOL. ORIGINAL ARTICLE CAN BE FOUND ON C# CORNER (WWW.C-SHARPCORNER.COM).


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 About the author
 
Mahesh Chand
Mahesh is a software consultant, architect, author, MCP, MVP, and founder of C# Corner. He has over 13 years of experience building systems for Financial and Banking, Engineering & Architectural, Imaging, Construction, Biological & Pharmaceuticals, Healthcare and Education industries including Microsoft, Unisys, Barclay’s, Centocor (J&J), McGraw-Hill, Excelon, PMI, and University of Pennsylvania Hospital. Since year 2000, he is been working with, ASP.NET, SQL Server, C# and .NET. His latest experience and interest is Silverlight, WPF, WCF, XAML and .NET 3.5. If you need any consulting in ASP.NET, AJAX, WPF, WCF, or XAML, contact him at mahesh AT c-sharpcorner DOT com
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C# Consulting is founded in 2002 by the founders of C# Corner. Unlike a traditional consulting company, our consultants are well-known experts in .NET and many of them are MVPs, authors, and trainers. We specialize in Microsoft .NET development and utilize Agile Development and Extreme Programming practices to provide fast pace quick turnaround results. Our software development model is a mix of Agile Development, traditional SDLC, and Waterfall models.
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Subject Posted By Posted On
download a file Sandra10/25/2006

Hello,

I am trying to download a file from internet using WebClient in an vb.net application but I am getting a verification page instead of the file that is a .csv file.  If I put the URL directly in the Internet Explorer, it works perfectly and I can download the file but for some reason I cannot do that directly from VB.NET.  Can you please help me?

Thanks,

 

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Download Files using HTTP and Proxy Server in VB.NETKaran2/15/2008
I hv used ur sample code n it's worked well. Thank You Mahesh
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browsing Web hassan11/26/2008
Thank you for this example but i have Question !!! How can use this Example to browsing Web Like private proxy Or something like that . Thank you ....
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