in Windows application, webRequest.GetResponse() Behavior :
1) First time, I tried with "invalid user name/ credentials" and getting the below error.
"ERROR: The remote server returned an error: (407) Proxy
Authentication Required."
and now I am giving valid "user name and credentials" -> getting the response
2) Now the reverse scenario,
i.e I called the API with valid userName and password -> working
after this, if I try with an invalid credential, I am getting the response.
Code Snippet:
private void button1_Click(object sender, EventArgs e)
{
label1.Text = string.Empty;
var webProxy = new WebProxy("http://proxy:80/",true)
{
Credentials = new NetworkCredential("UserName", "PassWord"),
UseDefaultCredentials = false
};
WebRequest.DefaultWebProxy = webProxy;
try
{
var webRequest = (HttpWebRequest)WebRequest.Create("http://Google.co.in");
webRequest.Proxy = webProxy;
webRequest.Timeout = 30 * 1000;
using (var webResponse = (HttpWebResponse)webRequest.GetResponse())
{
label1.Text = string.Format("WebRequest Response Code : {0}. Web Request Status : {1}", webResponse.StatusCode, webResponse.StatusDescription);
}
}
catch (Exception ex)
{
label1.Text = ex.Message;
}
finally { WebRequest.DefaultWebProxy = null; }
}
I am not able to find the exact reason, how the call become success, please help me to understand the above scenario.
Related
I have the following methods that are encountering some sort of failure with my database. No error is being written to my console, so I'm confused. I'm using JDBC and Google AppEngine. Can anyone help me, please? Thanks.
public List<Bulletin> getApprovedBulletins() {
List<Bulletin> bulletins = new ArrayList<Bulletin>();
try {
Connection connection = getConnection();
Statement statement = connection.createStatement();
statement.executeQuery("select * from bulletins where approved = true");
ResultSet resultSet = statement.getResultSet();
while (resultSet.next()) {
Bulletin bulletin = new Bulletin();
bulletin.setId(resultSet.getInt("id"));
bulletin.setDate(resultSet.getDate("bulletin_date"));
bulletin.setName(resultSet.getString("name"));
bulletin.setSubject(resultSet.getString("subject"));
bulletin.setNote(resultSet.getString("bulletin"));
bulletins.add(bulletin);
}
resultSet.close();
connection.close();
return bulletins;
}
catch (Exception e) {
System.out.println(e.toString());
}
return null;
}
private Connection getConnection() {
Connection conn = null;
String url = "jdbc:mysql://localhost:3306/cpc";
String driver = "com.mysql.jdbc.Driver";
String userName = "root";
String password = "password";
try {
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url, userName, password);
} catch (Exception e) {
return null;
}
return conn;
}
If you're using eclipse check the markers tab for errors. Note that the driver must be in the application server folder as well in order to work. Not sure why you don't get any errors in the console though...
Problem solved. I found a place to print out a message to my console, and it turns out I needed to add the following to appengine-web.xml, which I have done.
<sessions-enabled>true</sessions-enabled>
I'm trying to call the google URL shortner API from a WP7 app, I tried first on a Console Application by doing this:
var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/urlshortener/v1/url");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = "{\"longUrl\":\"http://www.google.com/\"}";
Console.WriteLine(json);
streamWriter.Write(json);
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var responseText = streamReader.ReadToEnd();
Console.WriteLine(responseText);
}
Console.Read();
and it worked fine, and returned everything OK, but when I try to do it on a Windows Phone App like this:
private void button1_Click(object sender, RoutedEventArgs e)
{
testConnection();
}
private void testConnection()
{
if (!NetworkInterface.GetIsNetworkAvailable())
MessageBox.Show("There's no internet connection, please reconnect to the internet and try again");
else
{
var req = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/urlshortener/v1/url");
req.ContentType = "application/json";
req.Method = "POST";
req.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), req);
textBlock2.Text = "Done";
}
}
void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest webRequest = (HttpWebRequest)asynchronousResult.AsyncState;
// End the stream request operation
Stream postStream = webRequest.EndGetRequestStream(asynchronousResult);
// Create the post data
// Demo POST data:
string postData = "http://www.google.com";
byte[] byteArray = Encoding.Unicode.GetBytes(postData);
// Add the post data to the web request
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
// Start the web request
webRequest.BeginGetResponse(new AsyncCallback(GetResponseCallback), webRequest);
}
void GetResponseCallback(IAsyncResult asynchronousResult)
{
try
{
HttpWebRequest webRequest = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response;
// End the get response operation
response = (HttpWebResponse)webRequest.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamReader = new StreamReader(streamResponse);
textBlock1.Text= streamReader.ReadToEnd();
streamResponse.Close();
streamReader.Close();
response.Close();
}
catch (WebException e)
{
}
}
The code always goes to the catch of the try method and gives "not found" error.
There is a known issue with SSL and not-trusted certificates. Connection to a web site with SSL that require ClientCertificates is not supported in the current Windows Phone 7 application model (Only BasicAuthentication is supported). You can read about the same problem here: http://forums.create.msdn.com/forums/p/65076/398730.aspx
I had a similar issue (which makes sense since I started out with this code as my example...) and when I changed the following code it started working to the point where I could progress forward again.
... from:
byte[] byteArray = Encoding.Unicode.GetBytes(postData);
... to (the equivalent of):
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
Experts,
I'm new to OAuth,
I'm writing an small App in windows Phone 7, I'm using OAuth2 for google contacts, I need to get the initial URL API (1) to get the Token
1) https://accounts.google.com/o/oauth2/auth?response_type=code&scope=https://www.google.com/m8/feeds/&redirect_uri=REDIRECT_URI&client_id=CLIENT_ID&hl=en-US&from_login=1&as=NEW_AS&pli=1
I got the success code, and when I'm trying to use this
https://www.google.com/m8/feeds/contacts/default/full?access_token=TOKEN_CODE
but I'm getting 401 error back,
Can you please advice, what mistake i'm going.
I've taken Twitter OAuth example as base, and doing modifications.
CODE
var uri = new Uri(url);
var request = BuildOAuthWebRequest(url, null);
MakeGetRequest(callback, request);
private static HttpWebRequest BuildOAuthWebRequest( string url, string realm)
{
var header = new StringBuilder();
var request = (HttpWebRequest)WebRequest.Create(url);
return request;
}
private static void MakeGetRequest(EventHandler<OAuthEventArgs> callback, HttpWebRequest request)
{
var asyncState = request.BeginGetResponse(new AsyncCallback((asyncRes) =>
{
HttpWebResponse response = null;
try
{
//request has returned
response = (HttpWebResponse)request.EndGetResponse(asyncRes);
if (response.StatusCode == HttpStatusCode.OK)
{
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
var token = sr.ReadToEnd();
callback(null, new OAuthEventArgs() { Response = token });
}
}
}
catch (WebException we)
{
string t = new StreamReader(we.Response.GetResponseStream()).ReadToEnd();
callback(null, new OAuthEventArgs() { Error = we, ErrorMessage = t, IsError = true });
}
catch (Exception e)
{
callback(null, new OAuthEventArgs() { Error = e, ErrorMessage = e.Message, IsError = true });
}
finally
{
if (response != null)
response.Close();
}
}), null);
}
Hi I'm making an app that when it launches makes a HttpWebRequest, receives some XML and puts it in a list. This code is in the Application_Launching method in App.xaml.cs . This list is then used in a listpicker on the first page of the app.
However because HttpWebRequest executes on a different thread the list is not populated when I assign it to to the Listpickers itemSource.
I've been told I should have an event that fires after the list is full and a listener on my first page to populate the list when this happens. How would I declare this event and its listener?
You can use HttpWebRequest and make AsyncCallback or use WebClient class which has an event DownloadStringCompleted. An example.
public void GetXMLfromServer()
{
try
{
string url = "";//your url here
HttpWebRequest request =
(HttpWebRequest)HttpWebRequest.Create(new Uri(url));
request.BeginGetResponse(new AsyncCallback(GetXMLfromServerCompleted),
request);
}
catch (Exception ex)
{
}
}
private void GetXMLfromServerCompleted(IAsyncResult asynchronousResult)
{
try
{
string resultString = "";
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
using (StreamReader streamReader1 = new StreamReader(response.GetResponseStream()))
{
resultString = streamReader1.ReadToEnd();
}
//**Put your code here to populate the list**
}
catch (Exception ex)
{
}
}
in a Silverlight-Windows Phone 7-project I am creating an HttpWebRequest, get the RequestStream, write something into the Stream and try to get the response, but I always get a NotSupportedException:
"System.Net.Browser.OHWRAsyncResult.AsyncWaitHandle threw an exception of type 'System.NotSupportedException'
My production code is far more complicated, but I can narrow it down to this small piece of code:
public class HttpUploadHelper
{
private HttpWebRequest request;
private RequestState state = new RequestState();
public HttpUploadHelper(string url)
{
this.request = WebRequest.Create(url) as HttpWebRequest;
state.Request = request;
}
public void Execute()
{
request.Method = "POST";
this.request.BeginGetRequestStream(
new AsyncCallback(BeginRequest), state);
}
private void BeginRequest(IAsyncResult ar)
{
Stream stream = state.Request.EndGetRequestStream(ar);
state.Request.BeginGetResponse(
new AsyncCallback(BeginResponse), state);
}
private void BeginResponse(IAsyncResult ar)
{
// BOOM: NotSupportedException was unhandled;
// {System.Net.Browser.OHWRAsyncResult}
// AsyncWaitHandle = 'ar.AsyncWaitHandle' threw an
// exception of type 'System.NotSupportedException'
HttpWebResponse response = state.Request.EndGetResponse(ar) as HttpWebResponse;
Debug.WriteLine(response.StatusCode);
}
}
public class RequestState
{
public WebRequest Request;
}
}
Does anybody know what is wrong with this code?
The NotSupportedException can be thrown when the request stream isn't closed before the call to EndGetResponse. The WebRequest stream is still open and sending data to the server when you're attempting to get the response. Since stream implements the IDisposable interface, a simple solution is to wrap your code using the request stream in a using block:
private void BeginRequest(IAsyncResult ar)
{
using (Stream stream = request.EndGetRequestStream(ar))
{
//write to stream in here.
}
state.Request.BeginGetResponse(
new AsyncCallback(BeginResponse), state);
}
The using block will ensure that the stream is closed before you attempt to get the response from the web server.
The issue is with how you're dealing with the accessing the original requests in the callback from BeginGetResponse.
Rather than holding a reference ot the state, get a reference back to the original request with:
var request = (HttpWebRequest)asynchronousResult.AsyncState;
Have a look at this very basic (but working) example of implementing logging in by posting email and password credentials to a website.
public static string Email;
public static string Password;
private void LoginClick(object sender, RoutedEventArgs e)
{
Email = enteredEmailAddress.Text.Trim().ToLower();
Password = enteredPassword.Password;
var request = (HttpWebRequest)WebRequest.Create(App.Config.ServerUris.Login);
request.ContentType = "application/x-www-form-urlencoded";
request.Method = "POST";
request.BeginGetRequestStream(ReadCallback, request);
}
private void ReadCallback(IAsyncResult asynchronousResult)
{
var request = (HttpWebRequest)asynchronousResult.AsyncState;
using (var postStream = request.EndGetRequestStream(asynchronousResult))
{
using (var memStream = new MemoryStream())
{
var content = string.Format("Password={0}&Email={1}",
HttpUtility.UrlEncode(Password),
HttpUtility.UrlEncode(Email));
var bytes = System.Text.Encoding.UTF8.GetBytes(content);
memStream.Write(bytes, 0, bytes.Length);
memStream.Position = 0;
var tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
postStream.Write(tempBuffer, 0, tempBuffer.Length);
}
}
request.BeginGetResponse(ResponseCallback, request);
}
private void ResponseCallback(IAsyncResult asynchronousResult)
{
var request = (HttpWebRequest)asynchronousResult.AsyncState;
using (var resp = (HttpWebResponse)request.EndGetResponse(asynchronousResult))
{
using (var streamResponse = resp.GetResponseStream())
{
using (var streamRead = new StreamReader(streamResponse))
{
string responseString = streamRead.ReadToEnd();
// do something with responseString to check if login was successful
}
}
}
}
NotSupportedException can also be thrown when string url is too long. I had messed up and attached post data to url instead of post body. When the data was short, it worked just fine, but once it grew too large - EndGetResponse crashed.
Change this:
state.Request.BeginGetResponse(
new AsyncCallback(BeginResponse), state);
To this:
state.Request.BeginGetResponse(BeginResponse, state);