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Hello I try to write a HTTP Request in C# (Post), but I need help with an error

Expl: I want to send the Content of a DLC File to the Server and recive the decrypted content.

C# Code

public static void decryptContainer(string dlc_content) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://dcrypt.it/decrypt/paste"); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; using (StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII)) { writer.Write("content=" + dlc_content); } HttpWebResponse response = (HttpWebResponse)request.GetResponse(); using (StreamReader reader = new StreamReader(response.GetResponseStream())) { Console.WriteLine(reader.ReadToEnd()); } }

and here I got the html request

<form action="/decrypt/paste" method="post"> <fieldset> <p class="formrow"> <label for="content">DLC content</label> <input id="content" name="content" type="text" value="" /> </p> <p class="buttonrow"><button type="submit">Submit »</button></p> </fieldset> </form>

Error Message:

{ "form_errors": { "__all__": [ "Sorry, an error occurred while processing the container." ] } }

Would be very helpfull if someone could help me solving the problem!

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7 Answers 7

Reset to default
14

You haven't set a content-length, which might cause issues. You could also try writing bytes directly to the stream instead of converting it to ASCII first.. (do it the opposite way to how you're doing it at the moment), eg:

public static void decryptContainer(string dlc_content) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://dcrypt.it/decrypt/paste"); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; byte[] _byteVersion = Encoding.ASCII.GetBytes(string.Concat("content=", dlc_content)); request.ContentLength = _byteVersion.Length Stream stream = request.GetRequestStream(); stream.Write(_byteVersion, 0, _byteVersion.Length); stream.Close(); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); using (StreamReader reader = new StreamReader(response.GetResponseStream())) { Console.WriteLine(reader.ReadToEnd()); } }

I've personally found posting like this to be a bit "fidgity" in the past. You could also try setting the ProtocolVersion on the request.

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7

I would simplify your code, like this:

public static void decryptContainer(string dlc_content) { using (var client = new WebClient()) { var values = new NameValueCollection { { "content", dlc_content } }; client.Headers[HttpRequestHeader.Accept] = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; string url = "http://dcrypt.it/decrypt/paste"; byte[] result = client.UploadValues(url, values); Console.WriteLine(Encoding.UTF8.GetString(result)); } }

It also ensures that the request parameters are properly encoded.

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2 Comments

It also ensures that parameters are encoded more or less properly. See stackoverflow.com/a/10836145/4136325
Which webClient did you use?
4 
public string void decryptContainer(string dlc_content) //why not return a string, let caller decide what to do with it. { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://dcrypt.it/decrypt/paste"); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";//sure this is needed? Maybe just match the one content-type you expect. using (StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII)) { writer.Write("content=" + Uri.EscapeDataString(dlc_content));//escape the value of dlc_content so that the entity sent is valid application/x-www-form-urlencoded } using(HttpWebResponse response = (HttpWebResponse)request.GetResponse())//this should be disposed when finished with. using (StreamReader reader = new StreamReader(response.GetResponseStream())) { return reader.ReadToEnd(); } }

There could still be a problem with what is actually being sent.

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1

One issue I see right away is that you need to URL encode value of the content parameter. Use HttpUtility.UrlEncode() for that. Other than that there might be other issues there, but it is hard to say not knowing what service does. The error is too generic and could mean anything

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request.ContentLength should be set as well.

Also, is there a reason you are ASCII encoding vs UTF8?

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HttpWebRequest sets ContentLength itself by default. application/x-www-form-urlencoded will always be in the ASCII range, so it's identical between both encodings.
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Get the stream associated with the response first then pass that into the Streamreader as below:

 Stream receiveStream = response.GetResponseStream(); using (StreamReader reader = new StreamReader(receiveStream, Encoding.ASCII)) { Console.WriteLine(reader.ReadToEnd()); }
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As I can't comment on the solution of Jon Hanna. This solved it for me: Uri.EscapeDataString

 // this is what we are sending string post_data = "content=" + Uri.EscapeDataString(dlc_content); // this is where we will send it string uri = "http://dcrypt.it/decrypt/paste"; // 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(); Console.WriteLine(new StreamReader(response.GetResponseStream()).ReadToEnd()); Console.WriteLine(response.StatusCode);
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