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How make a post to URL and get the response

I try to post an XML file to the url and get the response back. I have this code to post. I am not really sure how to check if it is posting correctly and how to get the response.
WebRequest req = null;
WebResponse rsp = null;
// try
// {
string fileName = #"C:\ApplicantApproved.xml";
string uri = "http://stage.test.com/partners/wp/ajax/consumeXML.php";
req = WebRequest.Create(uri);
req.Method = "POST"; // Post method
req.ContentType = "text/xml; encoding='utf-8'";
// Wrap the request stream with a text-based writer
StreamWriter writer = new StreamWriter(req.GetRequestStream());
// Write the XML text into the stream
writer.WriteLine(this.GetTextFromXMLFile(fileName));
writer.Close();
// Send the data to the webserver
rsp = req.GetResponse();
I think I should have response in rsp but I am not seeing anything usufull on it.

Please try following.
WebRequest req = null;
string fileName = #"C:\ApplicantApproved.xml";
string uri = "http://stage.test.com/partners/wp/ajax/consumeXML.php";
req = WebRequest.Create(uri);
req.Method = "POST"; // Post method
req.ContentType = "text/xml; encoding='utf-8'";
// Write the XML text into the stream
byte[] byteArray = Encoding.UTF8.GetBytes(this.GetTextFromXMLFile(fileName));
// Set the ContentLength property of the WebRequest.
req.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = req.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close();
WebResponse response = req.GetResponse();
// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
Console.WriteLine(responseFromServer);
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();

try
req.ContentType = "application/xml";

why is my String throw error?

I want to target this string type "application/json" for urban airship api. Can you guys help me whats wrong with my string and structure?
string postData = "{"audience":"all","device_types":["android"],"notification":{"alert":"This is a broadcast."}}";
I did tried adding back slash "\" example below:
string postData = "{\"audience\":\"all\",\"device_types\":[\"android\"],\"notification\":{\"alert\":\"This is a broadcast.\"}}";
Below are my full code:
// Create a request using a URL that can receive a post.
WebRequest request = WebRequest.Create("https://go.urbanairship.com/api/push/");
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.
string postData = "{'audience':'all','device_types':'['android']','notification': {'alert':'This is a broadcast.'}";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/json";
// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;
//Do a http basic authentication somehow
string username = "Zx5EPSG7Qhu-BvYtz0laTg";
string password = "sIaj2CjASlm27pimHqOfhA";
string usernamePassword = username + ":" + password;
CredentialCache mycache = new CredentialCache();
mycache.Add(new Uri("https://go.urbanairship.com/api/push/"), "Basic", new NetworkCredential(username, password));
request.Credentials = mycache;
request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(usernamePassword)));
// Get the request stream.
Stream dataStream = request.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close();
// Get the response.
WebResponse response = request.GetResponse();
// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
Console.WriteLine(responseFromServer);
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
I got below error:
400 Bad Request – The request body was invalid, either due to malformed JSON or a data validation error. See the response body for more detail.

This should work:
{
"audience" : "all",
"device_types" : ["android"],
"notification" : {
"alert" : "This is a broadcast."
}
}

You have small type in the first value, an additional ' sign after "all":
{
"audience": "all"',
"device_types": [
"android"
],
"notification": {
"alert": "This is a broadcast."
}
}
In future, you can use online validators for such cases, like JSONLint.

How to post non-standard XML with C#

I have utilities that post standard XML, but am faced with interacting with a server that requires something I'm not familiar with.
The expected XML format is like this:
"xmldata=<txn><element_1>element_1_value</element_1><element_2>element_2_value</element_2></txn>"
When I post using my standard method:
byte[] data = Encoding.ASCII.GetBytes(XDocumentToString(xml));
var client = new WebClient();
client.Headers.Add("Content-Type", "text/xml");
byte[] result = client.UploadData(new Uri(url), "POST", data);
string resultString = Encoding.ASCII.GetString(result);
return XDocument.Parse(resultString);
I get an error message about the XML not being formatted correctly.
When I use some stuff I've found:
var request = _requestFactory.CreateCreditCardSaleRequest(xmlStringFromAbove);
WebRequest webRequest = WebRequest.Create("https://domain.com/process_some_xml.do");
webRequest.Method = "POST";
byte[] byteArray = Encoding.UTF8.GetBytes(request);
// Set the ContentType property of the WebRequest.
webRequest.ContentType = "text/xml; encoding='utf-8'";
// Set the ContentLength property of the WebRequest.
webRequest.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = webRequest.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
// dataStream.Close();
// Get the response.
WebResponse response = webRequest.GetResponse();
// Display the status.
var httpWebResponse = (HttpWebResponse) response;
Console.WriteLine(httpWebResponse.StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
the response seems to indicate success, but no response content as expected.
I suspect it has something to do with the "xmldata=" at the beginning of the request, but cannot be sure.
Any suggestions?

Judging from the xmldata=, it sounds like the API wants the data sent as form-urlencoded. I suggest trying this:
string dataStr = "xmldata=" + HttpUtility.UrlEncode(XDocumentToString(xml));
byte[] data = Encoding.ASCII.GetBytes(dataStr);
and this:
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

How to Call Java Servelet and get response from it in asp.net?

I got a Java Servelet like
http://152.252.271.12:9999/media/servlet/RequestProcessor.do
for this I need to pass parameters in Querystring like this
http://152.252.271.12:9999/media/servlet/RequestProcessor.do?input=abc
I need to read response back.
I tried like this.
request.Method = "POST";
request.KeepAlive = false;
request.Credentials = CredentialCache.DefaultCredentials;
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(postData);
}
// Read Response.
HttpWebResponse webresponse = (HttpWebResponse)request.GetResponse();
using (StreamReader reader = new StreamReader(webresponse.GetResponseStream(), Encoding.Default))
{
result = reader.ReadToEnd();
logtxn.LogTxn(result, "SPDCL RESPONSE");
}
webresponse.Close();
Any help appreciated..

Use WebRequest & WebResponse classes. Check http://gsraj.tripod.com/dotnet/webgetpost.html for more information.

I've had a similar problem in the past, I had to host a service in IIS that accepted a string containing a request and returned another string with a response to that request. All of the above needed to be done using HTTP POST.
The solution I found was to host a WCF service on IIS and configure it to use HTTP GET/POST protocols.
Also I remember that I needed to use a Stream class to input and output data (a simple string would not work in this case), in other words, I had a HTTP POST method in WCF that was something like:
Stream GetData(Stream data);
Take a look at this article.

You can use the WebClient class, as a client for the servlet. For example
WebClient myWebClient = new WebClient();
// Download the Web resource and save it into a data buffer.
byte[] myDataBuffer = myWebClient.DownloadData (#"http://152.252.271.12:9999/media/servlet/RequestProcessor.do?input=abc");
// Display the downloaded data.
string download = Encoding.ASCII.GetString(myDataBuffer);
Now parse the result string download and obtain the response.

Please find the below code:
public class MyWebRequest
{
private WebRequest request;
private Stream dataStream;
private string status;
public String Status
{
get
{
return status;
}
set
{
status = value;
}
}
public MyWebRequest(string url)
{
// Create a request using a URL that can receive a post.
request = WebRequest.Create(url);
}
public MyWebRequest(string url, string method): this(url)
{
if (method.Equals("GET") || method.Equals("POST"))
{
// Set the Method property of the request to POST.
request.Method = method;
}
else
{
throw new Exception("Invalid Method Type");
}
}
public MyWebRequest(string url, string method, string data): this(url, method)
{
// Create POST data and convert it to a byte array.
string postData = data;
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;
// Get the request stream.
dataStream = request.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close();
}
public string GetResponse()
{
// Get the original response.
WebResponse response = request.GetResponse();
this.Status = ((HttpWebResponse) response)
.StatusDescription;
// Get the stream containing all content returned by the requested server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content fully up to the end.
string responseFromServer = reader.ReadToEnd();
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
return responseFromServer;
}
}
//create the constructor with post type and few data
MyWebRequest myRequest = new MyWebRequest("http://www.yourdomain.com", "POST", "a=value1&b=value2");
//show the response string on the console screen.
Console.WriteLine(myRequest.GetResponse());

post data through httpwebrequest and get it in php

I have this php code in server :
foreach($_POST as $pdata)
echo " *-* ". $pdata." *-*<br> ";
and i am sending post data by httpwebrequest in c# :
HttpWebRequest httpWebRequest = HttpWebRequest.Create("http://127.0.0.1/22") as HttpWebRequest;
//Specifing the Method
httpWebRequest.Method = "POST";
//Data to Post to the Page, itis key value pairs; separated by "&"
string data = "Username=username&password=password";
//Setting the content type, it is required, otherwise it will not work.
httpWebRequest.ContentType = "application/x-www-form-urlencoded";
//Getting the request stream and writing the post data
using (StreamWriter sw = new StreamWriter(httpWebRequest.GetRequestStream()))
{
sw.Write(data);
}
//Getting the Respose and reading the result.
HttpWebResponse httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse;
using (StreamReader sr = new StreamReader(httpWebResponse.GetResponseStream()))
{
MessageBox.Show(sr.ReadToEnd());
}
static html codes of php page are shown.
but nothing of posted value are shown in messagebox .that means no data are posted.
what is wrong?

You need to get the bytes of the data.
Try this code, from this guy's blog post.
public string Post(string url, string data) {
string vystup = null;
try
{
//Our postvars
byte[] buffer = Encoding.ASCII.GetBytes(data);
//Initialisation, we use localhost, change if appliable
HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(url);
//Our method is post, otherwise the buffer (postvars) would be useless
WebReq.Method = "POST";
//We use form contentType, for the postvars.
WebReq.ContentType = "application/x-www-form-urlencoded";
//The length of the buffer (postvars) is used as contentlength.
WebReq.ContentLength = buffer.Length;
//We open a stream for writing the postvars
Stream PostData = WebReq.GetRequestStream();
//Now we write, and afterwards, we close. Closing is always important!
PostData.Write(buffer, 0, buffer.Length);
PostData.Close();
//Get the response handle, we have no true response yet!
HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
//Let's show some information about the response
Console.WriteLine(WebResp.StatusCode);
Console.WriteLine(WebResp.Server);
//Now, we read the response (the string), and output it.
Stream Answer = WebResp.GetResponseStream();
StreamReader _Answer = new StreamReader(Answer);
vystup = _Answer.ReadToEnd();
//Congratulations, you just requested your first POST page, you
//can now start logging into most login forms, with your application
//Or other examples.
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return vystup.Trim()+"\n";
}