I have been using the following code to obtain a simple web response from Apache 2.2 in SilverLight to no avail.
private void bDoIt_Click(object sender, RoutedEventArgs e)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri("/silverlight/TestPage2.html"));
request.Method = "POST";
request.ContentType = "text/xml";
request.BeginGetRequestStream(new AsyncCallback(RequestProceed), request);
}
private void RequestProceed(IAsyncResult asuncResult)
{
HttpWebRequest request = (HttpWebRequest)asuncResult.AsyncState;
StreamWriter postDataWriter = new StreamWriter(request.EndGetRequestStream(asuncResult));
postDataWriter.Close();
request.BeginGetResponse(new AsyncCallback(ResponceProceed), request);
}
private void ResponceProceed(IAsyncResult asuncResult)
{
HttpWebRequest request = (HttpWebRequest)asuncResult.AsyncState;
HttpWebResponse responce = (HttpWebResponse)request.EndGetResponse(asuncResult);
StreamReader responceReader = new StreamReader(responce.GetResponseStream());
string responceString = responceReader.ReadToEnd();
txtData.Text = responceString;
}
Does anyone no a better method of doing this?
Have you tried WebClient? This exists on silverlight, and might make life easier. Presumably you'd want UploadStringAsync.
Also - I believe you need to use and absolute url; if you don't want to hard code (quite reasonably), you can get your host from:
string url = App.Current.Host.Source.AbsoluteUri;
Then use string / etc methods to make the correct "http://yoursite/whatever/your.page";
Note that silverlight only allows (IIRC) connections to the host site.
You can do the BeginGetResponse call as the first call in your sample test case, the BeginGetRequestStream call is only needed if you are intending to pass some POST data to the requested page.
Related
I am new to silverlight. I am programming in Visual Studio 2010 for Windows phone.
I try to do HttpWebRequest but debugger says ProtocolViolationException.
This my code
private void log_Click(object sender, RoutedEventArgs e)
{
//auth thi is my url for request
string auth;
string login = Uri.EscapeUriString(this.login.Text);
string password = Uri.EscapeUriString(this.pass.Password);
auth = "https://api.vk.com/oauth/token";
auth += "?grant_type=password" + "&client_id=*****&client_secret=******&username=" + login + "&password=" + password + "&scope=notify,friends,messages";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(auth);
request.BeginGetRequestStream(RequestCallBack, request);//on this line debager say ProtocolViolationExceptio
}
void RequestCallBack(IAsyncResult result)
{
HttpWebRequest request = result.AsyncState as HttpWebRequest;
Stream stream = request.EndGetRequestStream(result);
request.BeginGetResponse(ResponceCallBack, request);
}
void ResponceCallBack(IAsyncResult result)
{
HttpWebRequest request = result.AsyncState as HttpWebRequest;
HttpWebResponse response = request.EndGetResponse(result) as HttpWebResponse;
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
string a =sr.ReadToEnd();
MessageBox.Show(a);
}
}
I think the problem is that you aren't using POST, but GET. Try this:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(auth);
request.Method = "POST";
request.BeginGetRequestStream(RequestCallBack, request);
You aren't even doing anything with the request stream when you get it.
HttpWebRequest is assuming that the reason you tried to get it, was to write content to it (the only reason for getting it, after all).
Since you aren't allowed to include content in a GET request, it realises that the only thing you can do with that stream, is something that would violate the HTTP protocol. As a tool for using the HTTP protocol, it's its job to stop you making that mistake.
So it throws ProtocolViolationException.
Cut out the bit about the request stream - it's only for POST and PUT. Go straight to GetResponse() or BeginGetResponse() at that point.
I want to send a HTTP PUT request to a WCF server from Windows Phone 8, and for identification I have to send a custom header. (assume "mycustomheader" = "abc")
I was using WebClient so far, but the Webclient.Headers seems not to have an Add method, so it is not possible to send headers other then the ones in HttpRequestHeader enum. Is there any way to do this with WebClient?
I saw it is possible to set a custom header with HttpWebRequest class, but I just can't get it to do anything at all. My test code (basically the sample copied from http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.begingetrequeststream.aspx):
public void dosth()
{
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create("http://mycomputer/message");
wr.Method = "PUT";
wr.ContentType = "application/x-www-form-urlencoded";
wr.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), wr);
allDone.WaitOne();
}
private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string postData = "{'Command': { 'RequestType' : 'Status', 'Test' : '1' }}";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
postStream.Write(byteArray, 0, postData.Length);
postStream.Close();
request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
}
private static void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
streamResponse.Close();
streamRead.Close();
response.Close();
allDone.Set();
}
As I can see with wireshark: nothing is arriving at my computer (same url and everything works fine with WebClient .. except for the custom header). In debugging I can see the GetRequestStreamCallback being fired and running through. But it never arrives in the GetResponseCallback. Most stuff I find regarding this refers to methods like GetResponse() that seem not to be available on
Whats is the way to go here? Is it possible to get the HttpWebRequest to work, or is there some workaround to get the custom header set in WebClient or is there even another better way?
edit: webclient code:
WebClient wc = new WebClient();
wc.Headers[HttpRequestHeader.ContentLength] = data.Length.ToString();
wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
wc.UploadStringAsync(new Uri("http://mycomputer/message"), "PUT", data);
sends the correct data to the correct url. However setting custom header seems not to be possible. (even tried \r\n inside a header ... but this is not allowed and throws exception)
Where do you set the header?
Here is how to do it:
request.Headers["mycustomheader"] = "abc";
I am new to silverlight. I am programming in Visual Studio 2010 for Windows phone.
I try to do HttpWebRequest but debugger says ProtocolViolationException.
This my code
private void log_Click(object sender, RoutedEventArgs e)
{
//auth thi is my url for request
string auth;
string login = Uri.EscapeUriString(this.login.Text);
string password = Uri.EscapeUriString(this.pass.Password);
auth = "https://api.vk.com/oauth/token";
auth += "?grant_type=password" + "&client_id=*****&client_secret=******&username=" + login + "&password=" + password + "&scope=notify,friends,messages";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(auth);
request.BeginGetRequestStream(RequestCallBack, request);//on this line debager say ProtocolViolationExceptio
}
void RequestCallBack(IAsyncResult result)
{
HttpWebRequest request = result.AsyncState as HttpWebRequest;
Stream stream = request.EndGetRequestStream(result);
request.BeginGetResponse(ResponceCallBack, request);
}
void ResponceCallBack(IAsyncResult result)
{
HttpWebRequest request = result.AsyncState as HttpWebRequest;
HttpWebResponse response = request.EndGetResponse(result) as HttpWebResponse;
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
string a =sr.ReadToEnd();
MessageBox.Show(a);
}
}
I think the problem is that you aren't using POST, but GET. Try this:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(auth);
request.Method = "POST";
request.BeginGetRequestStream(RequestCallBack, request);
You aren't even doing anything with the request stream when you get it.
HttpWebRequest is assuming that the reason you tried to get it, was to write content to it (the only reason for getting it, after all).
Since you aren't allowed to include content in a GET request, it realises that the only thing you can do with that stream, is something that would violate the HTTP protocol. As a tool for using the HTTP protocol, it's its job to stop you making that mistake.
So it throws ProtocolViolationException.
Cut out the bit about the request stream - it's only for POST and PUT. Go straight to GetResponse() or BeginGetResponse() at that point.
I know this question has been asked quite a lot of times which is how I have got to where I am at with the code below however I just can't get it to work on the particular website I am trying to access. At the site I am trying to access I need to retrieve certain values from the page however things like price and availability only come up after logging in so I am trying to submit my login information and then go to the product page to get the information I need using HTML Agility Pack.
At the moment it seems to attempt the login however the website is either not accepting it or the cookies are not present on the next page load to actually keep me logged in.
If someone could help me with this I would be very grateful as I am not a programmer but have been assigned this task as part of a software installation.
protected void Button5_Click(object sender, System.EventArgs e)
{
string LOGIN_URL = "http://www.videor.com/quicklogin/1/0/0/0/index.html";
string SECRET_PAGE_URL = "http://www.videor.com/item/47/32/0/703/index.html?scriptMode=&CUSTOMERNO=xxx&USERNAME=xxx&activeTabId=0";
// have a cookie container ready to receive the forms auth cookie
CookieContainer cookies = new CookieContainer();
// first, request the login form to get the viewstate value
HttpWebRequest webRequest = WebRequest.Create(LOGIN_URL) as HttpWebRequest;
webRequest.CookieContainer = cookies;
StreamReader responseReader = new StreamReader(
webRequest.GetResponse().GetResponseStream()
);
string responseData = responseReader.ReadToEnd();
responseReader.Close();
string postData = "CUSTOMERNO=xxxx&USERNAME=xxxxx&PASSWORD=xxxxx";
// now post to the login form
webRequest = WebRequest.Create(LOGIN_URL) as HttpWebRequest;
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.CookieContainer = cookies;
// write the form values into the request message
StreamWriter requestWriter = new StreamWriter(webRequest.GetRequestStream());
requestWriter.Write(postData);
requestWriter.Close();
// we don't need the contents of the response, just the cookie it issues
webRequest.GetResponse().Close();
// now we can send out cookie along with a request for the protected page
webRequest = WebRequest.Create(SECRET_PAGE_URL) as HttpWebRequest;
webRequest.CookieContainer = cookies;
responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
// and read the response
responseData = responseReader.ReadToEnd();
responseReader.Close();
Response.Write(responseData);
}
This isn't a direct answer since I'm not sure what's wrong with your code (from a cursory glance it looks ok), but another approach is to use browser automation using Selenium . The following code will actually load the page using Chrome (you can swap out Firefox or IE) and is simpler to code against. It also won't break if they add javascript or something.
var driver = new ChromeDriver();
driver.Navigate().GoToUrl(LOGON_URL);
driver.FindElement(By.Id("UserName")).SendKeys("myuser");
driver.FindElement(By.Id("Password")).SendKeys("mypassword");
driver.FindElement(By.TagName("Form")).Submit();
driver.Navigate().GoToUrl(SECRET_PAGE_URL);
// And now the html can be found as driver.PageSource. You can also look for
// different elements and get their inner text and stuff as well.
I created a simple SL 4 app to connect to Google Analytics but I keep getting the following exception:
{System.Security.SecurityException: Security error.
at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
at System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at GoogleAnalytics.Silverlight.MainPage.<>c__DisplayClass4.<GetResponseCallback>b__3()}
I think it has something to do with xss but I'm not sure how to get around that. The following code works fine in a console app but doesn't in SL.
The UI has a textblock control, here's the code:
private byte[] _data;
public MainPage()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
}
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
string requestData = "Email=email#gmail.com" +
"&Passwd=password" +
"&source=Test-App" +
"&accountType=GOOGLE" +
"&service=analytics";
_data = Encoding.UTF8.GetBytes(requestData);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri("https://www.google.com/accounts/ClientLogin", UriKind.Absolute));
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = _data.Length;
request.BeginGetRequestStream(GetRequestStreamCallback, request);
}
private void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
this.Dispatcher.BeginInvoke(() =>
{
try
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
Stream stream = request.EndGetRequestStream(asynchronousResult);
stream.Write(_data, 0, _data.Length);
stream.Close();
request.BeginGetResponse(GetResponseCallback, request);
}
catch (Exception e)
{
textBlock.Text = e.ToString();
}
});
}
private void GetResponseCallback(IAsyncResult asynchronousResult)
{
this.Dispatcher.BeginInvoke(() =>
{
try
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream stream = response.GetResponseStream();
StreamReader streamReader = new StreamReader(stream, Encoding.UTF8);
textBlock.Text = streamReader.ReadToEnd().Split(new string[] { "Auth=" }, StringSplitOptions.None)[1];
streamReader.Close();
response.Close();
}
catch (Exception e)
{
textBlock.Text = e.ToString();
}
});
}
Update: fixed a typo.
Thanks
Just some tipps, i haven't tested your code yet, but they might help.
Use a WebClient for Web requests, it's much less and cleaner code... You will find examples on MSDN <- this link also contains almost all interesting topics on Silverlight Web/http/https requests and security - a must read in your scenario
Problems might occur if you're testing from a wrong environment like testing the Silverlight object from a local file url (web Url starting with file:///...). Create a Web-Project in your service, configure the Silverlight Project to run in that created Web project under the Test Web Server or the local IIS
I know, no code examples just links or tipps, they might help you though.
Best regards
UPDATE
What exactly are you trying to do? If you want to track, I've seen a few ready solutions for silverlight, for example Silverlight Analytics or Tracking Silverlight. Here is another known solution.
Silverlight cannot connect to GA services, I either have to use a service or JavaScript then pass the data to Silverlight.