httpwebresponse - Page 4

Hit external url from code-behind

- by Steven

I have a form on my site. The user enters their e-mail and selects a location from a dropdown. I then need to post that data to an external site by hitting a url with the user's location and e-mail in the query string. I'm doing this like so: string url = "http://www.site.com/page.aspx?location=" + location.Text + "&email=" + email.Text; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); My client says that I am not hitting their server, but when going through the debugger, I'm getting a response from their server. I also tried tracking what was happening by using Firebug, and I noticed that there was no POST made to that external site. What am I doing wrong here?

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Running out of memory when getting a bitmap from a server?

- by ikky

Hi! I'm making an application which uses MANY images. The application gets the images from a server, and downloads them one at a time. After many images the creation of a bitmap returns an exception, but i don't know how to solve this. Here is my function for downloading the images: public static Bitmap getImageFromWholeURL(String sURL) { HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(sURL); myRequest.Method = "GET"; // If it does not exist anything on the url, then return null try { HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(myResponse.GetResponseStream()); myResponse.Close(); return bmp; } catch (Exception e) { return null; } } Can anyone help me out here? Thanks in advance!

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How to SetCookie() in a System.Net.HttpWebRequest request for another Page2.aspx?

- by Mike108

How can I SetCookie in Page1.aspx by a System.Net.HttpWebRequest request for Page2.aspx which handle the SetCookie() function? Page1.aspx and Page2.aspx are in the same webapp. Page1.aspx: protected void Page_Load(object sender, EventArgs e) { string url = "http://localhost/Page2.aspx"; System.Net.HttpWebRequest myReq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url); System.Net.HttpWebResponse HttpWResp = (System.Net.HttpWebResponse)myReq.GetResponse(); System.IO.Stream myStream = HttpWResp.GetResponseStream(); } Page2.aspx: protected void Page_Load(object sender, EventArgs e) { string userName = "Lily"; FormsAuthentication.SetAuthCookie(userName, true); }

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Accessing SharePoint 2010 Data with REST/OData on Windows Phone 7

- by Jan Tielens

Consuming SharePoint 2010 data in Windows Phone 7 applications using the CTP version of the developer tools is quite a challenge. The issue is that the SharePoint 2010 data is not anonymously available; users need to authenticate to be able to access the data. When I first tried to access SharePoint 2010 data from my first Hello-World-type Windows Phone 7 application I thought “Hey, this should be easy!” because Windows Phone 7 development based on Silverlight and SharePoint 2010 has a Client Object Model for Silverlight. Unfortunately you can’t use the Client Object Model of SharePoint 2010 on the Windows Phone platform; there’s a reference to an assembly that’s not available (System.Windows.Browser). My second thought was “OK, no problem!” because SharePoint 2010 also exposes a REST/OData API to access SharePoint data. Using the REST API in SharePoint 2010 is as easy as making a web request for a URL (in which you specify the data you’d like to retrieve), e.g. http://yoursiteurl/_vti_bin/listdata.svc/Announcements. This is very easy to accomplish in a Silverlight application that’s running in the context of a page in a SharePoint site, because the credentials of the currently logged on user are automatically picked up and passed to the WCF service. But a Windows Phone application is of course running outside of the SharePoint site’s page, so the application should build credentials that have to be passed to SharePoint’s WCF service. This turns out to be a small challenge in Silverlight 3, the WebClient doesn’t support authentication; there is a Credentials property but when you set it and make the request you get a NotImplementedException exception. Probably this issued will be solved in the very near future, since Silverlight 4 does support authentication, and there’s already a WCF Data Services download that uses this new platform feature of Silverlight 4. So when Windows Phone platform switches to Silverlight 4, you can just use the WebClient to get the data. Even more, if the OData Client Library for Windows Phone 7 gets updated after that, things should get even easier! By the way: the things I’m writing in this paragraph are just assumptions that I make which make a lot of sense IMHO, I don’t have any info all of this will happen, but I really hope so. So are SharePoint developers out of the Windows Phone development game until they get this fixed? Well luckily not, when the HttpWebRequest class is being used instead, you can pass credentials! Using the HttpWebRequest class is slightly more complex than using the WebClient class, but the end result is that you have access to your precious SharePoint 2010 data. The following code snippet is getting all the announcements of an Annoucements list in a SharePoint site: HttpWebRequest webReq = (HttpWebRequest)HttpWebRequest.Create("http://yoursite/_vti_bin/listdata.svc/Announcements");webReq.Credentials = new NetworkCredential("username", "password"); webReq.BeginGetResponse( (result) => { HttpWebRequest asyncReq = (HttpWebRequest)result.AsyncState; XDocument xdoc = XDocument.Load( ((HttpWebResponse)asyncReq.EndGetResponse(result)).GetResponseStream()); XNamespace ns = "http://www.w3.org/2005/Atom"; var items = from item in xdoc.Root.Elements(ns + "entry") select new { Title = item.Element(ns + "title").Value }; this.Dispatcher.BeginInvoke(() => { foreach (var item in items) MessageBox.Show(item.Title); }); }, webReq); When you try this in a Windows Phone 7 application, make sure you add a reference to the System.Xml.Linq assembly, because the code uses Linq to XML to parse the resulting Atom feed, so the Title of every announcement is being displayed in a MessageBox. Check out my previous post if you’d like to see a more polished sample Windows Phone 7 application that displays SharePoint 2010 data.When you plan to use this technique, it’s of course a good idea to encapsulate the code doing the request, so it becomes really easy to get the data that you need. In the following code snippet you can find the GetAtomFeed method that gets the contents of any Atom feed, even if you need to authenticate to get access to the feed. delegate void GetAtomFeedCallback(Stream responseStream); public MainPage(){ InitializeComponent(); SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape; string url = "http://yoursite/_vti_bin/listdata.svc/Announcements"; string username = "username"; string password = "password"; string domain = ""; GetAtomFeed(url, username, password, domain, (s) => { XNamespace ns = "http://www.w3.org/2005/Atom"; XDocument xdoc = XDocument.Load(s); var items = from item in xdoc.Root.Elements(ns + "entry") select new { Title = item.Element(ns + "title").Value }; this.Dispatcher.BeginInvoke(() => { foreach (var item in items) { MessageBox.Show(item.Title); } }); });} private static void GetAtomFeed(string url, string username, string password, string domain, GetAtomFeedCallback cb){ HttpWebRequest webReq = (HttpWebRequest)HttpWebRequest.Create(url); webReq.Credentials = new NetworkCredential(username, password, domain); webReq.BeginGetResponse( (result) => { HttpWebRequest asyncReq = (HttpWebRequest)result.AsyncState; HttpWebResponse resp = (HttpWebResponse)asyncReq.EndGetResponse(result); cb(resp.GetResponseStream()); }, webReq);}

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Is SOAP Http POST more complicated than I thought

- by Pete Petersen

I'm currently writing a bit of code to send some xml data to a web service via HTTP POST. I thought this would be really simple and have written the following example code (C#) Console.WriteLine("Press enter to send data..."); while (Console.ReadLine() != "q") { HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(@"http://localhost:8888/"); Foo fooItem = new Foo { Member1 = "05", Member2 = "74455604", Member3 = "15101051", Member4 = 1, Member5 = "fsf", Member6 = 6.52, }; ASCIIEncoding encoding = new ASCIIEncoding(); string postData = fooItem.ToXml(); byte[] data = encoding.GetBytes(postData); httpWReq.Method = "POST"; httpWReq.ContentType = "application/xml"; httpWReq.ContentLength = data.Length; using (Stream stream = httpWReq.GetRequestStream()) { stream.Write(data, 0, data.Length); } HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse(); string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd(); Console.WriteLine("Received " + responseString); Console.WriteLine("Press enter to send data..."); } This is all I thought would be necessary, however I have now been given the details for the web service. This included some information which is unfarmiliar to me and I'm unsure whether I need to include it. The information I was sent was <url>http://sometext/soap/rpc</url> <namespace>http://sometext/a.services</namespace> <method>receiveInfo</method> <parm-id>xmldata</parm-id> (Input data) (Actual XML data as string) <parm-id>status</parm-id> (Output data) <userid>user</userid> <password>pass</password> <secure>false</secure> I guess this means I need to include a username and password somehow, but I'm not sure what the namespace or method fields are used for. Could anyone give me a hint? Sorry I've never used webservices before.

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How to use DoDirect/Paypal Pro in asp.net?

- by ptahiliani

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Net;using System.IO;using System.Collections;public partial class Default2 : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { //API Credentials (3-token) string strUsername = "<<enter your sandbox username here>>"; string strPassword = "<<enter your sandbox password here>>"; string strSignature = "<<enter your signature here>>"; string strCredentials = "USER=" + strUsername + "&PWD=" + strPassword + "&SIGNATURE=" + strSignature; string strNVPSandboxServer = "https://api-3t.sandbox.paypal.com/nvp"; string strAPIVersion = "2.3"; string strNVP = strCredentials + "&METHOD=DoDirectPayment" + "&CREDITCARDTYPE=" + "Visa" + "&ACCT=" + "4710496235600346" + "&EXPDATE=" + "10" + "2017" + "&CVV2=" + "123" + "&AMT=" + "12.34" + "&FIRSTNAME=" + "Demo" + "&LASTNAME=" + "User" + "&IPADDRESS=192.168.2.236" + "&STREET=" + "Lorem-1" + "&CITY=" + "Lipsum-1" + "&STATE=" + "Lorem" + "&COUNTRY=" + "INDIA" + "&ZIP=" + "302004" + "&COUNTRYCODE=IN" + "&PAYMENTACTION=Sale" + "&VERSION=" + strAPIVersion; try { //Create web request and web response objects, make sure you using the correct server (sandbox/live) HttpWebRequest wrWebRequest = (HttpWebRequest)WebRequest.Create(strNVPSandboxServer); wrWebRequest.Method = "POST"; StreamWriter requestWriter = new StreamWriter(wrWebRequest.GetRequestStream()); requestWriter.Write(strNVP); requestWriter.Close(); // Get the response. HttpWebResponse hwrWebResponse = (HttpWebResponse)wrWebRequest.GetResponse(); StreamReader responseReader = new StreamReader(wrWebRequest.GetResponse().GetResponseStream()); //and read the response string responseData = responseReader.ReadToEnd(); responseReader.Close(); string result = Server.UrlDecode(responseData); string[] arrResult = result.Split('&'); Hashtable htResponse = new Hashtable(); string[] responseItemArray; foreach (string responseItem in arrResult) { responseItemArray = responseItem.Split('='); htResponse.Add(responseItemArray[0], responseItemArray[1]); } string strAck = htResponse["ACK"].ToString(); if (strAck == "Success" || strAck == "SuccessWithWarning") { string strAmt = htResponse["AMT"].ToString(); string strCcy = htResponse["CURRENCYCODE"].ToString(); string strTransactionID = htResponse["TRANSACTIONID"].ToString(); //ordersDataSource.InsertParameters["TransactionID"].DefaultValue = strTransactionID; string strSuccess = "Thank you, your order for: $" + strAmt + " " + strCcy + " has been processed."; //successLabel.Text = strSuccess; Response.Write(strSuccess.ToString()); } else { string strErr = "Error: " + htResponse["L_LONGMESSAGE0"].ToString(); string strErrcode = "Error code: " + htResponse["L_ERRORCODE0"].ToString(); //errLabel.Text = strErr; //errcodeLabel.Text = strErrcode; Response.Write(strErr.ToString() + "<br/>" + strErrcode.ToString()); return; } } catch (Exception ex) { // do something to catch the error, like write to a log file. Response.Write("error processing"); } }}

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C# Persistent WebClient

- by Nullstr1ng

I have a class written in C# (Windows Forms) It's a WebClient class which I intent to use in some website and for Logging In and navigation. Here's the complete class pastebin.com (the class has 197 lines so I just use pastebin. Sorry if I made a little bit harder for you to read the class, also below this post) The problem is, am not sure why it's not persistent .. I was able to log in, but when I navigate to other page (without leaving the domain), I was thrown back to log in page. Can you help me solving this problem? one issue though is, the site I was trying to connect is "HTTPS" protocol. I have not yet tested this on just a regular HTTP. Thank you in advance. /* * Web Client v1.2 * --------------- * Date: 12/17/2010 * author: Jayson Ragasa */ using System; using System.Collections; using System.Collections.Specialized; using System.Collections.Generic; using System.Text; using System.IO; using System.Net; using System.Web; namespace Nullstring.Modules.WebClient { public class WebClientLibrary { #region vars string _method = string.Empty; ArrayList _params; CookieContainer cookieko; HttpWebRequest req = null; HttpWebResponse resp = null; Uri uri = null; #endregion #region properties public string Method { set { _method = value; } } #endregion #region constructor public WebClientLibrary() { _method = "GET"; _params = new ArrayList(); cookieko = new CookieContainer(); } #endregion #region methods public void ClearParameter() { _params.Clear(); } public void AddParameter(string key, string value) { _params.Add(string.Format("{0}={1}", WebTools.URLEncodeString(key), WebTools.URLEncodeString(value))); } public string GetResponse(string URL) { StringBuilder response = new StringBuilder(); #region create web request { uri = new Uri(URL); req = (HttpWebRequest)WebRequest.Create(URL); req.Method = "GET"; req.GetLifetimeService(); } #endregion #region get web response { resp = (HttpWebResponse)req.GetResponse(); Stream resStream = resp.GetResponseStream(); int bytesReceived = 0; string tempString = null; int count = 0; byte[] buf = new byte[8192]; do { count = resStream.Read(buf, 0, buf.Length); if (count != 0) { bytesReceived += count; tempString = Encoding.UTF8.GetString(buf, 0, count); response.Append(tempString); } } while (count > 0); } #endregion return response.ToString(); } public string GetResponse(string URL, bool HasParams) { StringBuilder response = new StringBuilder(); #region create web request { uri = new Uri(URL); req = (HttpWebRequest)WebRequest.Create(URL); req.MaximumAutomaticRedirections = 20; req.AllowAutoRedirect = true; req.Method = this._method; req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; req.KeepAlive = true; req.CookieContainer = this.cookieko; req.UserAgent = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_8; en-US) AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.224 Safari/534.10"; } #endregion #region build post data { if (HasParams) { if (this._method.ToUpper() == "POST") { string Parameters = String.Join("&", (String[])this._params.ToArray(typeof(string))); UTF8Encoding encoding = new UTF8Encoding(); byte[] loginDataBytes = encoding.GetBytes(Parameters); req.ContentType = "application/x-www-form-urlencoded"; req.ContentLength = loginDataBytes.Length; Stream stream = req.GetRequestStream(); stream.Write(loginDataBytes, 0, loginDataBytes.Length); stream.Close(); } } } #endregion #region get web response { resp = (HttpWebResponse)req.GetResponse(); Stream resStream = resp.GetResponseStream(); int bytesReceived = 0; string tempString = null; int count = 0; byte[] buf = new byte[8192]; do { count = resStream.Read(buf, 0, buf.Length); if (count != 0) { bytesReceived += count; tempString = Encoding.UTF8.GetString(buf, 0, count); response.Append(tempString); } } while (count > 0); } #endregion return response.ToString(); } #endregion } public class WebTools { public static string EncodeString(string str) { return HttpUtility.HtmlEncode(str); } public static string DecodeString(string str) { return HttpUtility.HtmlDecode(str); } public static string URLEncodeString(string str) { return HttpUtility.UrlEncode(str); } public static string URLDecodeString(string str) { return HttpUtility.UrlDecode(str); } } } UPDATE Dec 22GetResponse overload public string GetResponse(string URL) { StringBuilder response = new StringBuilder(); #region create web request { //uri = new Uri(URL); req = (HttpWebRequest)WebRequest.Create(URL); req.Method = "GET"; req.CookieContainer = this.cookieko; } #endregion #region get web response { resp = (HttpWebResponse)req.GetResponse(); Stream resStream = resp.GetResponseStream(); int bytesReceived = 0; string tempString = null; int count = 0; byte[] buf = new byte[8192]; do { count = resStream.Read(buf, 0, buf.Length); if (count != 0) { bytesReceived += count; tempString = Encoding.UTF8.GetString(buf, 0, count); response.Append(tempString); } } while (count 0); } #endregion return response.ToString(); } But still I got thrown back to login page. UPDATE: Dec 23 I tried listing the cookie and here's what I get at first, I have to login to a webform and this I have this Cookie JSESSIONID=368C0AC47305282CBCE7A566567D2942 then I navigated to another page (but on the same domain) I got a different Cooke? JSESSIONID=9FA2D64DA7669155B9120790B40A592C What went wrong? I use the code updated last Dec 22

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KeepAliveException when using HttpWebRequest.GetResponse

- by Lucas

I am trying to POST an attachment to CouchDB using the HttpWebRequest. However, when I attempt "response = (HttpWebResponse)httpWebRequest.GetResponse();" I receive a WebException with the message "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server." I have found some articles stating that setting the keepalive to false and httpversion to 1.0 resolves the situation. I am finding that it does not yeilding the exact same error, plus I do not want to take that approach as I do not want to use the 1.0 version due to how it handles the connection. Any suggestions or ideas are welcome. I'll try them all until one works! public ServerResponse PostAttachment(Server server, Database db, Attachment attachment) { Stream dataStream; HttpWebResponse response = null; StreamReader sr = null; byte[] buffer; string json; string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x"); string headerTemplate = "Content-Disposition: form-data; name=\"_attachments\"; filename=\"" + attachment.Filename + "\"\r\n Content-Type: application/octet-stream\r\n\r\n"; byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(headerTemplate); byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n"); HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://" + server.Host + ":" + server.Port.ToString() + "/" + db.Name + "/" + attachment.Document.Id); httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary; httpWebRequest.Method = "POST"; httpWebRequest.KeepAlive = true; httpWebRequest.ContentLength = attachment.Stream.Length + headerbytes.Length + boundarybytes.Length; if (!string.IsNullOrEmpty(server.EncodedCredentials)) httpWebRequest.Headers.Add("Authorization", server.EncodedCredentials); if (!attachment.Stream.CanRead) throw new System.NotSupportedException("The stream cannot be read."); // Get the request stream try { dataStream = httpWebRequest.GetRequestStream(); } catch (Exception e) { throw new WebException("Failed to get the request stream.", e); } buffer = new byte[server.BufferSize]; int bytesRead; dataStream.Write(headerbytes,0,headerbytes.Length); attachment.Stream.Position = 0; while ((bytesRead = attachment.Stream.Read(buffer, 0, buffer.Length)) > 0) { dataStream.Write(buffer, 0, bytesRead); } dataStream.Write(boundarybytes, 0, boundarybytes.Length); dataStream.Close(); // send the request and get the response try { response = (HttpWebResponse)httpWebRequest.GetResponse(); } catch (Exception e) { throw new WebException("Invalid response received from server.", e); } // get the server's response json try { dataStream = response.GetResponseStream(); sr = new StreamReader(dataStream); json = sr.ReadToEnd(); } catch (Exception e) { throw new WebException("Failed to access the response stream.", e); } // close up all our streams and response sr.Close(); dataStream.Close(); response.Close(); // Deserialize the server response return ConvertTo.JsonToServerResponse(json); }

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c# WebRequest to connect to wikipedia API

- by NickJ

Hey, This may be a pathetically simple problem but I cannot seem to format the post webrequest/response to get data from the wikipedia api. I have posted my code below if anyone can help me see my problem. string pgTitle = txtPageTitle.Text; Uri address = new Uri("http://en.wikipedia.org/w/api.php"); HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest; request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; string action = "query"; string query = pgTitle; StringBuilder data = new StringBuilder(); data.Append("action=" + HttpUtility.UrlEncode(action)); data.Append("&query=" + HttpUtility.UrlEncode(query)); byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString()); request.ContentLength = byteData.Length; using (Stream postStream = request.GetRequestStream()) { postStream.Write(byteData, 0, byteData.Length); } using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { // Get the response stream StreamReader reader = new StreamReader(response.GetResponseStream()); divWikiData.InnerText = reader.ReadToEnd(); }

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How to play non buffered .wav with MediaStreamSource implementation in Silverlight 4?

- by kyrisu

Background I'm trying to stream a wave file in Silverlight 4 using MediaStreamSource implementation found here. The problem is I want to play the file while it's still buffering, or at least give user some visual feedback while it's buffering. For now my code looks like that: private void button1_Click(object sender, RoutedEventArgs e) { HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(App.Current.Host.Source, "../test.wav")); //request.ContentType = "audio/x-wav"; request.AllowReadStreamBuffering = false; request.BeginGetResponse(new AsyncCallback(RequestCallback), request); } private void RequestCallback(IAsyncResult ar) { this.Dispatcher.BeginInvoke(delegate() { HttpWebRequest request = (HttpWebRequest)ar.AsyncState; HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(ar); WaveMediaStreamSource wavMss = new WaveMediaStreamSource(response.GetResponseStream()); try { me.SetSource(wavMss); } catch (InvalidOperationException) { // This file is not valid } me.Play(); }); } The problem is that after settings request.AllowREadStreamBuffer to false the stream does not support seeking and the above mentioned implementation throws an exception (keep in mind I've put some of the position setting logic into if(stream.CanSeek) block): Read is not supported on the main thread when buffering is disabled Question Is there a way to play wav stream without buffering it in advance?

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WebRequest.Create problem

- by Saurabh

My requirement is downlaoding a HTTM page. Like and I am using WebRequest.Create. But the line HttpWebRequest request = (HttpWebRequest) WebRequest.Create("http://www.mayosoftware.com"); Is throwinh an exception {"Configuration system failed to initialize"}. I am working in a compmany. Does it due to proxy or anything? But it’s occurring while creation of the URL it self. Exception trace is: at System.Configuration.ConfigurationManager.PrepareConfigSystem() at System.Configuration.ConfigurationManager.GetSection(String sectionName) at System.Configuration.PrivilegedConfigurationManager.GetSection(String sectionName) at System.Net.Configuration.WebRequestModulesSectionInternal.GetSection() at System.Net.WebRequest.get_PrefixList() at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase) Code is like void GetHTTPReq() { Looking forward on it. The complete code is as follows but problem is in the starting itself : \ // used to build entire input StringBuilder sb = new StringBuilder(); // used on each read operation byte[] buf = new byte[8192]; // prepare the web page we will be asking for HttpWebRequest request = (HttpWebRequest) WebRequest.Create("http://www.mayosoftware.com"); // execute the request HttpWebResponse response = (HttpWebResponse) request.GetResponse(); // we will read data via the response stream Stream resStream = response.GetResponseStream(); string tempString = null; int count = 0; do { // fill the buffer with data count = resStream.Read(buf, 0, buf.Length); // make sure we read some data if (count != 0) { // translate from bytes to ASCII text tempString = Encoding.ASCII.GetString(buf, 0, count); // continue building the string sb.Append(tempString); } } while (count > 0); // any more data to read? // print out page source Console.WriteLine(sb.ToString()); }

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How to save webpage to string with cookies support (httpWebRequest)

- by Maciej

I need to read webpage and store its content in string for further processing. Sounds simply but I have problem with cookies support. Opened page says I need browser supporting cookies (or turned on). I've made method trying do that via httpWebRequest - which normally works to me but I've come to a standstill with those unfortunate cookies... Any idea how to make it working? Here is my method: string ReadHtml (string address, string encoding) { Uri url = new Uri(address); CookieContainer cookieContainer = new CookieContainer(); HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url); httpWebRequest.AllowAutoRedirect = true; httpWebRequest.KeepAlive = true; httpWebRequest.CookieContainer = cookieContainer; httpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"; httpWebRequest.Method = "GET"; HttpWebResponse webResponse = (HttpWebResponse)httpWebRequest.GetResponse(); // Code Page Encoding enc = Encoding.GetEncoding(encoding); // Read content StreamReader loResponseStream = new StreamReader(webResponse.GetResponseStream(),enc); string lcHtml = loResponseStream.ReadToEnd(); webResponse.Close(); loResponseStream.Close(); return lcHtml; }

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File Upload with HttpWebRequest doesn't post the file

- by Sri Kumar

Hello All, Here is my code to post the file. I use asp fileupload control to get the file stream. HttpWebRequest requestToSender = (HttpWebRequest)WebRequest.Create("http://localhost:2518/Web/CrossPage.aspx"); requestToSender.Method = "POST"; requestToSender.ContentType = "multipart/form-data"; requestToSender.KeepAlive = true; requestToSender.Credentials = System.Net.CredentialCache.DefaultCredentials; requestToSender.ContentLength = BtnUpload.PostedFile.ContentLength; BinaryReader binaryReader = new BinaryReader(BtnUpload.PostedFile.InputStream); byte[] binData = binaryReader.ReadBytes(BtnUpload.PostedFile.ContentLength); Stream requestStream = requestToSender.GetRequestStream(); requestStream.Write(binData, 0, binData.Length); requestStream.Close(); HttpWebResponse responseFromSender = (HttpWebResponse)requestToSender.GetResponse(); string fromSender = string.Empty; using (StreamReader responseReader = new StreamReader(responseFromSender.GetResponseStream())) { fromSender = responseReader.ReadToEnd(); } XMLString.Text = fromSender; In the page load of CrossPage.aspx i have the following code NameValueCollection postPageCollection = Request.Form; foreach (string name in postPageCollection.AllKeys) { Response.Write(name + " " + postPageCollection[name]); } HttpFileCollection postCollection = Request.Files; foreach (string name in postCollection.AllKeys) { HttpPostedFile aFile = postCollection[name]; aFile.SaveAs(Server.MapPath(".") + "/" + Path.GetFileName(aFile.FileName)); } string strxml = "sample"; Response.Clear(); Response.Write(strxml); I don't get the file in Request.Files. The byte array is created. What was wrong with my HttpWebRequest?

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Get website's server from IP address

- by Steven

I have a function that returns a website's server when you enter the url for the site: private string GetWebServer() { string server = string.Empty; //get URL string url = txtURL.Text.Trim().ToLower(); if (!url.StartsWith("http://") && !url.StartsWith("https://")) url = "http://" + url; HttpWebRequest request = null; HttpWebResponse response = null; try { request = WebRequest.Create(url) as HttpWebRequest; response = request.GetResponse() as HttpWebResponse; server = response.Headers["Server"]; } catch (WebException wex) { server = "Unknown"; } finally { if (response != null) { response.Close(); } } return server; } I'd like to also be able to get a website's server from the IP address instead of the site's url. But if I enter an IP address, I get an error saying "Invalid URI: The format of the URI could not be determined." when calling WebRequest.Create(url). Does someone know how I can modify this to accomplish what I want?

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C# Client to Consume Google App Engine RESTful Webservice (rpc XML)

- by Ngu Soon Hui

I think I hit a problem when using C# client to consume Google App Engine Webservice. The Google App Engine code I use is here. This is how the python script on server would look like: from google.appengine.ext import webapp from google.appengine.ext.webapp.util import run_wsgi_app import logging from StringIO import StringIO import traceback import xmlrpclib from xmlrpcserver import XmlRpcServer class Application: def __init__(self): pass def getName(self,meta): return 'example' class XMLRpcHandler(webapp.RequestHandler): rpcserver = None def __init__(self): self.rpcserver = XmlRpcServer() app = Application() self.rpcserver.register_class('app',app) def post(self): request = StringIO(self.request.body) request.seek(0) response = StringIO() try: self.rpcserver.execute(request, response, None) except Exception, e: logging.error('Error executing: '+str(e)) for line in traceback.format_exc().split('\n'): logging.error(line) finally: response.seek(0) rstr = response.read() self.response.headers['Content-type'] = 'text/xml' self.response.headers['Content-length'] = "%d"%len(rstr) self.response.out.write(rstr) application = webapp.WSGIApplication( [('/xmlrpc/', XMLRpcHandler)], debug=True) def main(): run_wsgi_app(application) if __name__ == "__main__": main() The client side ( in Python) is this: import xmlrpclib s = xmlrpclib.Server('http://localhost:8080/xmlrpc/') print s.app.getName() I have no problem in using Python client to retrieve values from Google App Engine, but I do have difficulties in using a C# client to retrieve the values. The error I got was 404 method not found when I am trying to GetResponse from the web request. This is my code var request = (HttpWebRequest)WebRequest.Create("http://localhost:8080/xmlrpc/app"); request.Method = "GET"; request.ContentLength = 0; request.ContentType = "text/xml"; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) //404 method not found error here. { } I think it must be that the url is wrong, but I don't know how to get it right. Any idea?

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Maximum page fetch with maximum bandwith

- by Ehsan

Hi I want to create an application like a spider I've implement fetching page as the following code in multi-thread application but there is two problem 1) I want to use my maximum bandwidth to send/receive request, how should I config my request to do so (Like Download Accelerator application and the like) cause I heard the normal application will use 66% of the available bandwidth. 2) I don't know what exactly HttpWebRequest.KeepAlive do, but as its name implies I think i can create a connection to a website and without closing the connection sending another request to that web site using existing connection. does it boost performance or Im wrong ?? public PageFetchResult Fetch() { PageFetchResult fetchResult = new PageFetchResult(); try { HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(URLAddress); HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); Uri requestedURI = new Uri(URLAddress); Uri responseURI = resp.ResponseUri; string resultHTML = ""; byte[] reqHTML = ResponseAsBytes(resp); if (!string.IsNullOrEmpty(FetchingEncoding)) resultHTML = Encoding.GetEncoding(FetchingEncoding).GetString(reqHTML); else if (!string.IsNullOrEmpty(resp.CharacterSet)) resultHTML = Encoding.GetEncoding(resp.CharacterSet).GetString(reqHTML); req.Abort(); resp.Close(); fetchResult.IsOK = true; fetchResult.ResultHTML = resultHTML; } catch (Exception ex) { fetchResult.IsOK = false; fetchResult.ErrorMessage = ex.Message; } return fetchResult; }

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HttpWebRequest Timeouts After Ten Consecutive Requests

- by Bob Mc

I'm writing a web crawler for a specific site. The application is a VB.Net Windows Forms application that is not using multiple threads - each web request is consecutive. However, after ten successful page retrievals every successive request times out. I have reviewed the similar questions already posted here on SO, and have implemented the recommended techniques into my GetPage routine, shown below: Public Function GetPage(ByVal url As String) As String Dim result As String = String.Empty Dim uri As New Uri(url) Dim sp As ServicePoint = ServicePointManager.FindServicePoint(uri) sp.ConnectionLimit = 100 Dim request As HttpWebRequest = WebRequest.Create(uri) request.KeepAlive = False request.Timeout = 15000 Try Using response As HttpWebResponse = DirectCast(request.GetResponse, HttpWebResponse) Using dataStream As Stream = response.GetResponseStream() Using reader As New StreamReader(dataStream) If response.StatusCode <> HttpStatusCode.OK Then Throw New Exception("Got response status code: " + response.StatusCode) End If result = reader.ReadToEnd() End Using End Using response.Close() End Using Catch ex As Exception Dim msg As String = "Error reading page """ & url & """. " & ex.Message Logger.LogMessage(msg, LogOutputLevel.Diagnostics) End Try Return result End Function Have I missed something? Am I not closing or disposing of an object that should be? It seems strange that it always happens after ten consecutive requests. Notes: In the constructor for the class in which this method resides I have the following: ServicePointManager.DefaultConnectionLimit = 100 If I set KeepAlive to true, the timeouts begin after five requests. All the requests are for pages in the same domain. EDIT I added a delay between each web request of between two and seven seconds so that I do not appear to be "hammering" the site or attempting a DOS attack. However, the problem still occurs.

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Codemetric optimized httpwebrequest in C#

- by Omegavirus

Hello, the problem is the httpwebrequest method in my c# program. visual studio gives it a metric of 60, thats pretty lame.. so how can i program it more efficient? (: my actual code: public string httpRequest(string url) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "GET"; request.Proxy = WebRequest.DefaultWebProxy; request.MediaType = "HTTP/1.1"; request.ContentType = "text/xml"; request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12"; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); StreamReader streamr = new StreamReader(response.GetResponseStream(), Encoding.UTF8); String sresp = streamr.ReadToEnd(); streamr.Close(); return sresp; } thanks for helping. ;)

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How to log in to craigslist using c#

- by kosikiza

i m using the following code to log in to craigslist, but haven't succeeded yet. string formParams = string.Format("inputEmailHandle={0}&inputPassword={1}", "[email protected]", "removed"); //string postData = "[email protected]&inputPassword=removed"; string uri = "https://accounts.craigslist.org/"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); request.KeepAlive = true; request.ProtocolVersion = HttpVersion.Version10; request.Method = "POST"; byte[] postBytes = Encoding.ASCII.GetBytes(formParams); request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = postBytes.Length; Stream requestStream = request.GetRequestStream(); requestStream.Write(postBytes, 0, postBytes.Length); requestStream.Close(); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); cookyHeader = response.Headers["Set-cookie"]; string pageSource; string getUrl = "https://post.craigslist.org/del"; WebRequest getRequest = WebRequest.Create(getUrl); getRequest.Headers.Add("Cookie", cookyHeader); WebResponse getResponse = getRequest.GetResponse(); using (StreamReader sr = new StreamReader(getResponse.GetResponseStream())) { pageSource = sr.ReadToEnd(); }

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Display post data !

- by Comii

I am trying to post data from vb.net application to web service asmx that is located on server! For posting data from vb.net application I am using this code: Public Function Post(ByVal url As String, ByVal data As String) As String Dim vystup As String = Nothing Try 'Our postvars Dim buffer As Byte() = Encoding.ASCII.GetBytes(data) 'Initialisation, we use localhost, change if appliable Dim WebReq As HttpWebRequest = DirectCast(WebRequest.Create(url), HttpWebRequest) '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 Dim PostData As Stream = 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! Dim WebResp As HttpWebResponse = DirectCast(WebReq.GetResponse(), HttpWebResponse) '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. Dim Answer As Stream = WebResp.GetResponseStream() Dim _Answer As New StreamReader(Answer) 'Congratulations, you just requested your first POST page, you 'can now start logging into most login forms, with your application 'Or other examples. vystup = _Answer.ReadToEnd() Catch ex As Exception MessageBox.Show(ex.Message) End Try Return vystup.Trim() & vbLf End Function Now how i can retrieve this data in asmx service?

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How do I simulate the usage of a sequence of web pages?

- by Rory Becker

I have a simple sequence of web pages written in ASP.Net 3.5 SP1. Page1 - A Logon Form.... txtUsername, txtPassword and cmdLogon Page2 - A Menu (created using DevExpress ASP.Net controls) Page3 - The page redirected to by the server in the event that the user picks the right menu option in Page2 I would like to create a threaded program to simulate many users trying to use this sequence of pages. I have managed to create a host Winforms app which Launches a new thread for each "User" I have further managed to work out the basics of WebRequest enough to perform a request which retrieves the Logon page itself. Dim Request As HttpWebRequest = TryCast(WebRequest.Create("http://MyURL/Logon.aspx"), HttpWebRequest) Dim Response As HttpWebResponse = TryCast(Request.GetResponse(), HttpWebResponse) Dim ResponseStream As StreamReader = New StreamReader(Response.GetResponseStream(), Encoding.GetEncoding(1252)) Dim HTMLResponse As String = ResponseStream.ReadToEnd() Response.Close() ResponseStream.Close() Next I need to simulate the user having entered information into the 2 TextBoxes and pressing logon.... I have a hunch this requires me to add the right sort of "PostData" to the request. before submitting. However I'm also concerned that "ViewState" may be an issue. Am I correct regarding the PostData? How do I add the postData to the request? Do I need to be concerned about Viewstate? Update: While I appreciate that Selenium or similar products are useful for acceptance testing , I find that they are rather clumsy for what amounts to load testing. I would prefer not to load 100 instances of Firefox or IE in order to simulate 100 users hitting my site. This was the reason I was hoping to take the ASPNet HttpWebRequest route.

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How to Capture a live stream from Windows Media Server 2008

- by Hummad Hassan

I want to capture the live stream from windows media server to filesystem on my pc I have tried with my own media server with the following code. but when i have checked the out put file i have found this in it. FileStream fs = null; try { HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://mywmsserver/test"); CookieContainer ci = new CookieContainer(1000); req.Timeout = 60000; req.Method = "Get"; req.KeepAlive = true; req.MaximumAutomaticRedirections = 99; req.UseDefaultCredentials = true; req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3"; req.ReadWriteTimeout = 90000000; req.CookieContainer = ci; //req.MediaType = "video/x-ms-asf"; req.AllowWriteStreamBuffering = true; HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); Stream resps = resp.GetResponseStream(); fs = new FileStream("d:\\dump.wmv", FileMode.Create, FileAccess.ReadWrite); byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = resps.Read(buffer, 0, buffer.Length)) > 0) { fs.Write(buffer, 0, bytesRead); } } catch (Exception ex) { } finally { if (fs != null) fs.Close(); }

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how to login to criaglist through c#

- by kosikiza

i m using the following code to login to criaglist, but hav't successsed yet. string formParams = string.Format("inputEmailHandle={0}&inputPassword={1}", "[email protected]", "pakistan01"); //string postData = "[email protected]&inputPassword=pakistan01"; string uri = "https://accounts.craigslist.org/"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); request.KeepAlive = true; request.ProtocolVersion = HttpVersion.Version10; request.Method = "POST"; byte[] postBytes = Encoding.ASCII.GetBytes(formParams); request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = postBytes.Length; Stream requestStream = request.GetRequestStream(); requestStream.Write(postBytes, 0, postBytes.Length); requestStream.Close(); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); cookyHeader = response.Headers["Set-cookie"]; string pageSource; string getUrl = "https://post.craigslist.org/del"; WebRequest getRequest = WebRequest.Create(getUrl); getRequest.Headers.Add("Cookie", cookyHeader); WebResponse getResponse = getRequest.GetResponse(); using (StreamReader sr = new StreamReader(getResponse.GetResponseStream())) { pageSource = sr.ReadToEnd(); }

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multi-threaded proxy checker having problems

- by Paul

hello everyone, I am trying to create a proxy checker. This is my first attempt at multithreading and it's not going so well, the threads seem to be waiting for one to complete before initializing the next. Imports System.Net Imports System.IO Imports System.Threading Public Class Form1 Public sFileName As String Public srFileReader As System.IO.StreamReader Public sInputLine As String Public Class WebCall Public proxy As String Public htmlout As String Public Sub New(ByVal proxy As String) Me.proxy = proxy End Sub Public Event ThreadComplete(ByVal htmlout As String) Public Sub send() Dim myWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.myserver.com/ip.php"), HttpWebRequest) myWebRequest.Proxy = New WebProxy(proxy, False) Try Dim myWebResponse As HttpWebResponse = CType(myWebRequest.GetResponse(), HttpWebResponse) Dim loResponseStream As StreamReader = New StreamReader(myWebResponse.GetResponseStream()) htmlout = loResponseStream.ReadToEnd() Debug.WriteLine("Finished - " & htmlout) RaiseEvent ThreadComplete(htmlout) Catch ex As WebException If (ex.Status = WebExceptionStatus.ConnectFailure) Then End If Debug.WriteLine("Failed - " & proxy) End Try End Sub End Class Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim proxy As String Dim webArray As New ArrayList() Dim n As Integer For n = 0 To 2 proxy = srFileReader.ReadLine() webArray.Add(New WebCall(proxy)) Next Dim w As WebCall For Each w In webArray Threading.ThreadPool.QueueUserWorkItem(New WaitCallback(AddressOf w.send), w) Next w End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load srFileReader = System.IO.File.OpenText("proxies.txt") End Sub End Class

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cookies handling on webrequest and response

- by manish patel

I have created a application that has a function mainpost. It is created to post data on a https sites. Here I want to handle cookies in this function. How can I do this task? public string Mainpost(string website, string content) { // this is what we are sending string post_data = content; // this is where we will send it string uri = website; // create a request HttpWebRequest request = (HttpWebRequest) WebRequest.Create(uri); request.KeepAlive = false; request.ProtocolVersion = HttpVersion.Version10; request.Method = "POST"; // turn our request string into a byte stream byte[] postBytes = Encoding.ASCII.GetBytes(post_data); // this is important - make sure you specify type this way request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = postBytes.Length; Stream requestStream = request.GetRequestStream(); // now send it requestStream.Write(postBytes, 0, postBytes.Length); requestStream.Close(); // grab te response and print it out to the console along with the status // code HttpWebResponse response = (HttpWebResponse)request.GetResponse(); string str = (new StreamReader(response.GetResponseStream()).ReadToEnd()); Console.WriteLine(response.StatusCode); return str; }

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