The remote server returned an error: (503) Server Unavailable.

Question

User-10248131 posted

I want to mock up a button click event and passing a postdata using WebRequest, here is my code:

 

       Dim req As WebRequest = WebRequest.Create(site)
        'ctl00$TemplateBody$WebPartManager1$gwpciPublicRegistry$ciPublicRegistry$ResultsGrid$Sheet0$Input1$TextBox1
        Dim postData As String = "ctl00$TemplateBody$WebPartManager1$gwpciPublicRegistry$ciPublicRegistry$ResultsGrid$Sheet0$Input1$TextBox1=a"

        Dim send As Byte() = Encoding.[Default].GetBytes(postData)
        req.Method = "POST"
        req.ContentType = "application/x-www-form-urlencoded"
        req.ContentLength = send.Length

        Dim sout As Stream = req.GetRequestStream()
        sout.Write(send, 0, send.Length)
        sout.Flush()
        sout.Close()

        Dim res As WebResponse = req.GetResponse()

The code returns error in the last line above:

The remote server returned an error: (503) Server Unavailable.

Here is the site's URL:

http://ctcma.asicanada.net/CTCMAmbr/Public_Registry.aspx

What I want to do is to mockup TextBox1 has a value of "a" and then the button is clicked.

It would be appreciated if anyone can point out what's wrong with my code?

Answer 1

User-271186128 posted

Hi mdivk,<!--?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /--><o:p></o:p>

According to your code and description, I have created a sample in my side, the result as below:<o:p></o:p>

                // Create a request using a URL that can receive a post. 
               // WebRequest request = WebRequest.Create("http://www.contoso.com/PostAccepter.aspx");      //Worked well

               // WebRequest request = WebRequest.Create("http://10.168.176.22/testWinformdll/WebForm1.aspx");    //Worded well

                WebRequest request = WebRequest.Create("http://ctcma.asicanada.net/CTCMAmbr/Public_Registry.aspx");       // Throw The remote server returned an error: (503) Server Unavailable.

So, I suppose the issue is related to the remote server.

You could refer to this article: http://www.microsoft.com/technet/prodtechnol/windowsserver2003/library/iis/55f71614-ef1b-4015-b9c8-a42c1e700c25.mspx?mfr=true

Besides, here are some similar thread and relevant article, please refer to it.

The remote server returned an error: (503) Server Unavailable Asp.Net

How to: Send Data Using the WebRequest Class

Best Regards,
Dillion

Answer 2

User-10248131 posted

Thanks.

Reading https://msdn.microsoft.com/en-us/library/debx8sh9(v=vs.110).aspx, I have a question:

if the remote website has a textbox with the id of txtKeyword, and a search button

How do I (in my code) passing a value to txtKeyword and send the request to the website and get response?

Can you show me how to write the code?

Thank you very much.