Why does My HTTP Web Request Code Not Send a Request?
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23-08-2019 - |
Question
How to post the following HTTP requests in C#
POST http://10.0.0.1/st_poe.cgi
Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
Referer: http://10.0.0.1/RST_st_poe.htm
Accept-Language: en-US
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Host: 10.0.0.1
Content-Length: 21
Connection: Keep-Alive
Pragma: no-cache
Authorization: Basic YWStaW47c3Jsa3NobQ==
ConMethod=++Connect++
I'm trying to do it with the following code. It is not working.
string user = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(username + ":" + password));
byte[] bytes = System.Text.Encoding.ASCII.GetBytes("ConMethod=++Connect++");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://10.0.0.1/st_poe.cgi");
request.Method = "POST";
request.Headers.Add("Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*");
request.Referer = "http://10.0.0.1/RST_st_poe.htm";
request.Headers.Add("Accept-Language: en-US");
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)";
request.ContentType = "application/x-www-form-urlencoded";
request.Headers.Add("Accept-Encoding: gzip, deflate");
request.ContentLength = bytes.Length;
request.Headers.Add("Host: 10.0.0.1");
request.Headers.Add("Connection: Keep-Alive");
request.Headers.Add("Pragma: no-cache");
request.Headers.Add("Authorization: Basic "+user);
Stream reqStream = request.GetRequestStream();
reqStream.Write(bytes, 0, bytes.Length);
reqStream.Close();
Can anyone point out where I'm messing up. I'm using HttpWebRequest for the first time.
Solution
You should perform the actual request with
var response = request.GetResponse();
Alternatively, you can use the simpler System.Net.WebClient
class:
var client = new WebClient();
client.Headers["..."] = ...;
// Use one of the DownloadXXX/UploadXXX methods.
var responseBody = client.UploadData("Url", dataToUpload);
OTHER TIPS
Mehrdad has it right. I'll only add that if you're going to stick to HttpWebRequest, then you need to learn to use "using" blocks for any resource you allocate that implements IDisposable:
var user =
Convert.ToBase64String(
Encoding.UTF8.GetBytes(username + ":" + password));
var bytes = Encoding.ASCII.GetBytes("ConMethod=++Connect++");
var request =
(HttpWebRequest) WebRequest.Create("http://10.0.0.1/st_poe.cgi");
request.Method = "POST";
request.Headers.Add(
"Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*");
request.Referer = "http://10.0.0.1/RST_st_poe.htm";
request.Headers.Add("Accept-Language: en-US");
request.UserAgent =
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)";
request.ContentType = "application/x-www-form-urlencoded";
request.Headers.Add("Accept-Encoding: gzip, deflate");
request.ContentLength = bytes.Length;
request.Headers.Add("Host: 10.0.0.1");
request.Headers.Add("Connection: Keep-Alive");
request.Headers.Add("Pragma: no-cache");
request.Headers.Add("Authorization: Basic " + user);
using (var reqStream = request.GetRequestStream())
{
reqStream.Write(bytes, 0, bytes.Length);
}
using (var response = (HttpWebResponse) request.GetResponse())
{
using (var responseStream = response.GetResponseStream())
{
using (var reader = new StreamReader(responseStream))
{
return reader.ReadToEnd();
}
}
}
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