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I got error 500 when I try to post a json to webservice

I'm developing an application in c# windows form , When I try to send a large json, I got an exception erro 500.
This the method to POST
public void POST(string url, string jsonContent)
{
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
request.Method = "POST";
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
Byte[] byteArray = encoding.GetBytes(jsonContent);
request.ContentLength = byteArray.Length;
request.ContentType = "application/json";
using(Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
long length = 0;
try
{
using(HttpWebResponse response = (HttpWebResponse) request.GetResponse())
{
length = response.ContentLength;
}
}
catch (WebException ex)
{
// Log exception and throw as for GET example above
}
}
I can send others object in JSON, but especially this object that has a large datas I get this exception .
But when I try to GET from webservice this same object it worked very well.
The problem is , I can get this large data but I can't send this same data.
Following the code of my controller.
[Route("reconhecimento")]
[HttpPost]
public bool PostPessoasReconhecimento([FromBody]PessoaReconhecimentoModel[] newpessoaReconhecimento)
{
PessoaReconhecimentoModel pessoaReconhecimento = new PessoaReconhecimentoModel();
return pessoaReconhecimento.postPessoaReconhecimento(newpessoaReconhecimento);
}

Joab i suppose the problem could be related to dimension of your request.
Try to check if your question could be classified as duplicate of that ones :
Maximum default POST request size of IIS 7 - how to increase 64kB/65kB limit?

c# WebRequest Wont Post the whole length of data

I am currently having a problem.
I am trying to post my data to a PHP document but it does not get the whole value.
Somewhere in the middle it stops posting.
Does anyone know where the problem is located?
The bytearray is 7401 long. That cant be to long rigth?
My code is below:
public string RecieveData(string url, string postData = "")
{
WebRequest request = WebRequest.Create(url);
// If required by the server, set the credentials.
NetworkCredential nc = new NetworkCredential("user", "pass");
Stream dataStream;
if (postData != "")
{
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.string postData = "This is a test that posts this string to a Web server.";
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();
}
request.Credentials = nc;
// Get the response.
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// Display the status.
Console.WriteLine(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);
// Cleanup the streams and the response.
reader.Close();
dataStream.Close();
response.Close();
return responseFromServer;
/*
}
catch (Exception)
{
MessageBox.Show("Er is iets fout gegaan met verbinden");
return "";
}
*/
}

7401 is not too long.
My guess is that the data you are posting are not fully URL-encoded, e.g. one of the characters in the byte array causes the PhP parser to stop. Make sure you are looking at the raw data (e.g. using Wireshark).

Httpwebrequest--POST method using text file

I am trying to replicate a Couch database using .NET classes instead of a curl command line. I have never used WebRequest or Httpwebrequest before, but I am attempting to use them to make a post request with the script below.
Here is the JSON script for couchdb replication(I know this works):
{ ""_id"":"database_replicate8/7/12", "source":sourcedb, ""target"":"targetDB", ""create_target"":true, ""user_ctx"": { ""roles"": ["myrole"] } }
The above script is put into a text file, sourcefile.txt. I want to take this line and put it in a POST web request using .NET functionality.
After looking into it, I chose to use the httpwebrequest class. Below is what I have so far--I got this from http://msdn.microsoft.com/en-us/library/debx8sh9.aspx
HttpWebRequest bob = (HttpWebRequest)WebRequest.Create("sourceDBURL");
bob.Method = "POST";
bob.ContentType = "application/json";
byte[] bytearray = File.ReadAllBytes(#"sourcefile.txt");
Stream datastream = bob.GetRequestStream();
datastream.Write(bytearray, 0, bytearray.Length);
datastream.Close();
Am I going about this correctly? I am relatively new to web technologies and still learning how http calls work.

Here is a method I use for creating POST requests:
private static HttpWebRequest createNewPostRequest(string apikey, string secretkey, string endpoint)
{
HttpWebRequest request = WebRequest.Create(endpoint) as HttpWebRequest;
request.Proxy = null;
request.Method = "POST";
//Specify the xml/Json content types that are acceptable.
request.ContentType = "application/xml";
request.Accept = "application/xml";
//Attach authorization information
request.Headers.Add("Authorization", apikey);
request.Headers.Add("Secretkey", secretkey);
return request;
}
Within my main method I call it like this:
HttpWebRequest request = createNewPostRequest(apikey, secretkey, endpoint);
and I then pass my data to the method like this:
string requestBody = SerializeToString(requestObj);
byte[] byteStr = Encoding.UTF8.GetBytes(requestBody);
request.ContentLength = byteStr.Length;
using (Stream stream = request.GetRequestStream())
{
stream.Write(byteStr, 0, byteStr.Length);
}
//Parse the response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
//Business error
if (response.StatusCode != HttpStatusCode.OK)
{
Console.WriteLine(string.Format("Error: response status code is{0}, at time:{1}", response.StatusCode, DateTime.Now.ToString()));
return "error";
}
else if (response.StatusCode == HttpStatusCode.OK)//Success
{
using (Stream respStream = response.GetResponseStream())
{
XmlSerializer serializer = new XmlSerializer(typeof(SubmitReportResponse));
reportReq = serializer.Deserialize(respStream) as SubmitReportResponse;
}
}
...
In my case I serialize/deserialize my body from a class - you will need to alter this to use your text file. If you want an easy drop in solution, then change the SerializetoString method to a method that loads your text file to a string.

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";
}

Error getting response stream (ReadDone2): Receive Failure

Help me please.
After sending post query i have webexception "Error getting response stream (ReadDone2): Receive Failure". help get rid of this error. thanks.
piece of code
try
{
string queryContent = string.Format("login={0}&password={1}&mobileDeviceType={2}/",
login, sessionPassword, deviceType);
request = ConnectionHelper.GetHttpWebRequest(loginPageAddress, queryContent);
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())//after this line //occurs exception - "Error getting response stream (ReadDone2): Receive Failure"
{
ConnectionHelper.ParseSessionsIdFromCookie(response);
string location = response.Headers["Location"];
if (!string.IsNullOrEmpty(location))
{
string responseUri = Utils.GetUriWithoutQuery(response.ResponseUri.ToString());
string locationUri = Utils.CombineUri(responseUri, location);
result = this.DownloadXml(locationUri);
}
response.Close();
}
}
catch (Exception e)
{
errorCout++;
errorText = e.Message;
}
//Methot GetHttpWebRequest
public static HttpWebRequest GetHttpWebRequest(string uri, string queryContent)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.Proxy = new WebProxy(uri);
request.UserAgent = Consts.userAgent;
request.AutomaticDecompression = DecompressionMethods.GZip;
request.AllowWriteStreamBuffering = true;
request.AllowAutoRedirect = false;
string sessionsId = GetSessionsIdForCookie(uri);
if (!string.IsNullOrEmpty(sessionsId))
request.Headers.Add(Consts.headerCookieName, sessionsId);
if (queryContent != string.Empty)
{
request.ContentType = "application/x-www-form-urlencoded";
request.Method = "POST";
byte[] SomeBytes = Encoding.UTF8.GetBytes(queryContent);
request.ContentLength = SomeBytes.Length;
using (Stream newStream = request.GetRequestStream())
{
newStream.Write(SomeBytes, 0, SomeBytes.Length);
}
}
else
{
request.Method = "GET";
}
return request;
}

using (Stream newStream = request.GetRequestStream())
{
newStream.Write(SomeBytes, 0, SomeBytes.Length);
//try to add
newStream.Close();
}

In my case the server did not send a response body. After fixing the server, the "Receive Failure" vanished.
So you have two options:
Don't request a response stream, if you can live without it.
Make sure the server sends a response body.
E.g., instead of
self.send_response(200)
self.wfile.close()
the Python server code should be
self.send_response(200)
self.send_header('Content-type', 'text/plain')
self.end_headers()
self.wfile.write("Thanks!\n")
self.wfile.close()

its not Xamarin or .NET's bug. :wink:
your server side endpoint fails when requesting. :neutral:
check your API endpoint if you own the api or contact support if you are getting API from third party company or service.
why it happens randomly : :wink:
because bug is in your inner if or loop blocks and it happens when it goes through this buggy loop or if.
best regards. :smile: