I'm working on a asp.net webapplication, build in C#. I have to implement a third party web-service that is created using PHP. It is a very simple service containing only one function. I added the service reference using the wsdl, so far so good.
When I call the web-service function with the correct parameters it always returns null. I started troubleshooting with SoapUI. I captured the soap message from the application and pasted it in SoapUI, executed it and it returned the correct message. Using Fiddler I discovered something weird in the response from the web-service as shown in the raw output:
HTTP/1.1 200 OK
Date: Wed, 21 Nov 2012 15:24:31 GMT
Server: Apache/2.2.16 (Unix) mod_ssl/2.2.16 OpenSSL/0.9.8o
X-Powered-By: PHP/5.2.13-pl1-gentoo
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Set-Cookie: PHPSESSID=ddc342cfe7e56e77456fe31b758bf3de; path=/
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 812
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/xml; charset=utf-8
?????????KS?0???`r?~?<??? ?I
I?????0??+?.????kK.????[E?????[???????}??g4
?1J???~w?i??<?M?+w??[>]ziIc???.?
???yvi?"x? F??d?Y?aR,4?X?
[UQ^F)?$`?
7??[?F"?$??h???S?a??4??Q?E??6Td,t6%Hg??w/)??????]??G* ?l[??&6?0?$??>??????~?????:??6??W#?a????E?G?
s??Z????§o?_??c??\???-???)?????cc??w???/??f??}?)??r???????T?/??? m??K??8? ?X?/F8?<???:?m???&f ?Z#[31?*?X,c?Z??0h"??aFb.?<??p??a???Q?B?r>????Z??5??6???????n\y?d?.??\??Hc]??
Z,?x??l???g?Q?*&???1?)??????^?????v??pQ???_y~??%??????*?
>???;??6?+?>???RQq?????a?(?Z????C?5???G??Ce??H?9??xYL|"??i?
e8?Vk???s???AK^?e~??
??(??Lt???r???vs????7??d?w???Jj-B????pt????c??MBi?s)Mo?.??^?aB3?x8&??:_K|???5???)[?M?Xc?j?zX?=G?i/??TO???g????5??c0??w???T??
The header is displayed correctly. The response is encoded and needs to be decoded. Both SoapUI and Fiddler are able to decode the response, but the proxy class can't and returns null.
How can I overcome this problem? Any help is greatly appreciated!
EDIT:
The way the service is called:
LisenceServiceFR.ServiceRegistration_PortTypeClient client = new LisenceServiceFR.ServiceRegistration_PortTypeClient();
LisenceServiceFR.aVehicleInfo info = client.getVehicleInfo("xxx", "xxx", licensePlate, "localhost");
Edit 2:
The response XML from Fiddler.
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://services.audaconfr.com/ServiceRegistration.wsdl">
<SOAP-ENV:Body>
<SOAP-ENV:getVehicleInfoResponse>
<aVehicle>
<ns1:errorCode>200</ns1:errorCode>
<ns1:errorMessage>Success</ns1:errorMessage>
<ns1:vehicleXml>
<vehicule>
<carr>MONOSPACE COMPACT</carr>
<carr_cg>CI</carr_cg>
<co2>152</co2>
<!-- etc -->
</vehicule>
</ns1:vehicleXml>
</aVehicle>
</SOAP-ENV:getVehicleInfoResponse>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
I ended up using HttpWebRequest to call the webservice:
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.InnerXml = xml;
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(endPoint);
req.Timeout = 100000000;
if (proxy != null)
req.Proxy = new WebProxy(proxy, true);
req.Headers.Add("SOAPAction", "");
req.ContentType = "application/soap+xml;charset=\"utf-8\"";
req.Accept = "application/x-www-form-urlencoded";
req.Method = "POST";
Stream stm = req.GetRequestStream();
doc.Save(stm);
stm.Close();
WebResponse resp = req.GetResponse();
stm = resp.GetResponseStream();
StreamReader r = new StreamReader(stm);
string responseData = r.ReadToEnd();
XDocument response = XDocument.Parse(responseData);
/* extract data from response */
It was not the solution I was looking for, but is works like a charm.
Related
I'm trying to post to a web form defined as:
<form name="frmdata" method='post' enctype ='multipart/form-data' action ="http://www.rzp.cz/cgi-bin/aps_cacheWEB.sh">
<input type ="hidden" name ="VSS_SERV" value="ZVWSBJXML">
<input type="file" name="filename">
<input type ='submit' name ='x' value ='ODESLI'>
</form>
There is some additional documentation on the form here:
http://www.rzp.cz/docs/RZP02_XML_28.pdf
My latest try:
using (WebClient client = new WebClient())
{
NameValueCollection vals = new NameValueCollection();
vals.Add("VSS_SERV", "ZVWSBJXML");
string filecontent = #"<?xml version=""1.0"" encoding=""ISO-8859-2""?>";
filecontent = filecontent + #"
<VerejnyWebDotaz
elementFormDefault=""qualified""
targetNamespace=""urn:cz:isvs:rzp:schemas:VerejnaCast:v1""
xmlns=""urn:cz:isvs:rzp:schemas:VerejnaCast:v1"" version=""2.8"">";
filecontent = filecontent + #"
<Kriteria>
<IdentifikacniCislo>03358437</IdentifikacniCislo>
<PlatnostZaznamu>0</PlatnostZaznamu></Kriteria>";
filecontent = filecontent + #"</VerejnyWebDotaz>";
vals.Add("filename", filecontent);
client.Headers["ContentType"] = "multipart/form-data";
byte[] responseArray = client.UploadValues(#"http://www.rzp.cz/cgi-bin/aps_cacheWEB.sh", "POST", vals);
string str = Encoding.ASCII.GetString(responseArray);
}
But I can't get past this error:
<KodChyby>-1</KodChyby> (the xml filename does not contain xml defined by namespace)
How can I send this xml data to the form or rather there is a working form - http://stuff.petrovsky.cz/subdom/stuff/RZP/rzp-test-form.php - how to call and catch xml data? I would like to do the same request and get xml.
Using System.Net.Http I was able to construct the form request as a proof of concept using MultipartFormDataContent
Now initially when I tested it, I received 403 Forbidden response but I guessed that was to be expected given my location and that the endpoint might be region locked.
Raw Fiddler response
HTTP/1.1 403 Forbidden
Date: Sat, 27 Oct 2018 01:37:09 GMT
Server: IIS
Content-Length: 225
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>403 Forbidden</title>
</head><body>
<h1>Forbidden</h1>
<p>You don't have permission to access /cgi-bin/aps_cacheWEB.sh
on this server.</p>
</body></html>
I was wrong and the forbidden appeared to be the default response for bad requests as you commented that you received the same forbidden error from within the region. So back to the drawing board I went.
I then copied the example HTML form locally and then proceeded to compare the requests from the form (which did actually work) and my code. Gradually making changes to match I was finally able to get a 200 OK response, but the body of the response was empty.
Apparently there was an issue with the server interpreting the boundary in the content type header if it is wrapped in quotes boundary="...".
After more adjustments it then started returning a message based on the content dispositions generated.
HTTP/1.1 200 OK
Date: Sat, 27 Oct 2018 19:55:11 GMT
Server: IIS
Serial: 10.145
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/plain; charset=ISO-8859-2
Content-Length: 169
Multiple definitions of VSS_SERV encountered in input.
If you're trying to do this intentionally (such as with select),
the variable must have a "List" suffix.
So it turns out that the XML API is expecting the request to be in a very specific format. Deviate from that and the request fails.
The MultipartFormDataContent was not generating the request correctly and this caused the server to not behave as expected. Other headers were being placed before the Content-Disposition headers of the parts and the Content-Disposition parameters were also not being enclosed in quotes. So by not including the content-type it in the parts and making sure the content-disposition headers were generated correctly eventually fixed the problem.
It is important to note the order of how the headers are added to the content so that the Content-Disposition header is set first for each part.
Working Code that generates the request in the desired format and gets the XML data.
[Test]
public async Task Post_Form() {
//Arrange
var stream = getXml();
var fileContent = new StreamContent(stream);
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") {
Name = #"""filename""",
FileName = #"""req-details.xml""",
};
fileContent.Headers.ContentType = new MediaTypeHeaderValue("text/xml");
var stringContent = new ByteArrayContent(Encoding.UTF8.GetBytes("ZVWSBJXML"));
stringContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") {
Name = #"""VSS_SERV""",
};
//could have let system generate it but wanteed to rule it out as a problem
var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
var form = new MultipartFormDataContent(boundary);
//FIX: boundary quote issue
var contentType = form.Headers.ContentType.Parameters.First(o => o.Name == "boundary");
contentType.Value = contentType.Value.Replace("\"", String.Empty);
form.Add(stringContent);
form.Add(fileContent);
//var data = await form.ReadAsStringAsync(); //FOR TESTING PORPOSES ONLY!!
var client = createHttpClient("http://www.rzp.cz/");
//Act
var response = await client.PostAsync("cgi-bin/aps_cacheWEB.sh", form);
var body = await response.Content.ReadAsStringAsync();
//Assert
response.IsSuccessStatusCode.Should().BeTrue();
body.Should().NotBeEmpty();
var document = XDocument.Parse(body); //should be valid XML
document.Should().NotBeNull();
}
The code above generated the following request, which I extracted using fiddler (Pay close attention to the working format)
POST http://www.rzp.cz/cgi-bin/aps_cacheWEB.sh HTTP/1.1
User-Agent: System.Net.Http.HttpClient
Accept-Language: en-US, en; q=0.9
Accept: text/xml, application/xml
Cache-Control: max-age=0
Content-Type: multipart/form-data; boundary=---------------------------8d63c301f3e044f
Host: www.rzp.cz
Content-Length: 574
Accept-Encoding: gzip, deflate
Connection: Keep-Alive
-----------------------------8d63c301f3e044f
Content-Disposition: form-data; name="VSS_SERV"
ZVWSBJXML
-----------------------------8d63c301f3e044f
Content-Disposition: form-data; name="filename"; filename="req-details.xml"
Content-Type: text/xml
<?xml version="1.0" encoding="iso-8859-2"?>
<VerejnyWebDotaz xmlns="urn:cz:isvs:rzp:schemas:VerejnaCast:v1" version="2.8">
<Kriteria>
<IdentifikacniCislo>75848899</IdentifikacniCislo>
<PlatnostZaznamu>0</PlatnostZaznamu>
</Kriteria>
</VerejnyWebDotaz>
-----------------------------8d63c301f3e044f--
Which was able to get the following response.
HTTP/1.1 200 OK
Date: Sat, 27 Oct 2018 21:17:50 GMT
Server: IIS
Serial: 10.145
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/xml;charset=ISO-8859-2
Content-Length: 931
<?xml version='1.0' encoding='iso-8859-2'?>
<VerejnyWebOdpoved xmlns="urn:cz:isvs:rzp:schemas:VerejnaCast:v1" version="2.8">
<Datum>27.10.2018</Datum>
<Kriteria>
<IdentifikacniCislo>75848899</IdentifikacniCislo>
<PlatnostZaznamu>0</PlatnostZaznamu>
</Kriteria>
<PodnikatelSeznam>
<PodnikatelID>212fbf8314e01506b0d7</PodnikatelID>
<ObchodniJmenoSeznam Popis="Jméno a příjmení:">Filip Zrůst</ObchodniJmenoSeznam>
<IdentifikacniCisloSeznam Popis="Identifikační číslo osoby:">75848899</IdentifikacniCisloSeznam>
<TypPodnikatele Popis="Typ podnikatele:">Fyzická osoba</TypPodnikatele>
<AdresaPodnikaniSeznam Popis="Adresa sídla:">Vlašská 358/7, 118 00, Praha 1 - Malá Strana</AdresaPodnikaniSeznam>
<RoleSubjektu Popis="Role subjektu:">podnikatel</RoleSubjektu>
<EvidujiciUrad Popis="Úřad příslušný podle §71 odst.2 živnostenského zákona:">Úřad městské části Praha 1</EvidujiciUrad>
</PodnikatelSeznam>
</VerejnyWebOdpoved>
From there it should be small work to parse the resulting XML as needed.
Supporting code
Generate or load the stream of the XML for the form
private static Stream getXml() {
var xml = #"<?xml version=""1.0"" encoding=""ISO-8859-2""?>
<VerejnyWebDotaz
xmlns=""urn:cz:isvs:rzp:schemas:VerejnaCast:v1""
version=""2.8"">
<Kriteria>
<IdentifikacniCislo>75848899</IdentifikacniCislo>
<PlatnostZaznamu>0</PlatnostZaznamu>
</Kriteria>
</VerejnyWebDotaz>";
var doc = XDocument.Parse(xml);//basically to validate XML
var stream = new MemoryStream();
doc.Save(stream);
stream.Position = 0;
return stream;
}
Was gradually able to whittle down the headers needed for a successful request after find the match that worked. Try removing others gradually to test if more can be removed safely to reduce the amount of unnecessary code needed.
private static HttpClient createHttpClient(string baseAddress) {
var handler = createHandler();
var client = new HttpClient(handler);
client.BaseAddress = new Uri(baseAddress);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", "System.Net.Http.HttpClient");
client.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Language", "en-US,en;q=0.9");
client.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "text/xml,application/xml");
client.DefaultRequestHeaders.ExpectContinue = false;
client.DefaultRequestHeaders.ConnectionClose = false;
client.DefaultRequestHeaders.CacheControl = new CacheControlHeaderValue() {
MaxAge = TimeSpan.FromSeconds(0)
};
return client;
}
private static HttpClientHandler createHandler() {
var handler = new HttpClientHandler();
// if the framework supports automatic decompression set automatic decompression
if (handler.SupportsAutomaticDecompression) {
handler.AutomaticDecompression = System.Net.DecompressionMethods.GZip |
System.Net.DecompressionMethods.Deflate;
}
return handler;
}
While I chose to use the asynchronous API of System.Net.Http, I found a similar question
Reference UploadFile with POST values by WebClient
With an answer that was done using WebClient that could be adapted to your question so that a request can be constructed similar to what was produced above.
I tried testing that one as well but got into the same forbidden error. Now that the correct format is know you should also be able to correctly craft a working request using WebClient/WebRequest
I have the following code, which submits XML to a 3rd party web service, which errors (intentionally, at the moment) on "req.GetResponse()" with the error, detailed below.
byte[] bytes = Encoding.ASCII.GetBytes(myXMLData);
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(myWebsite);
using (Stream os = req.GetRequestStream())
{
os.Write(bytes, 0, bytes.Length);
}
WebResponse response = req.GetResponse();
string responseStream = StringFromResponseStream(response);
Error from GetResponse()
Exception thrown: 'System.New.WebExtension' in System.dll
Additional information: The remote server returned an error: (400) Bad Request
When I trace this call in Fiddler, I can see that the response from the service, also includes a far more useful error (below; RAW view), which I am trying to get to:
HTTP/1.1 400 Bad Request
Date: Thu, 16 Jun 2016 10:42:26 GMT
Cache-Control: private
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
Content-Type: text/plain; charset=UTF-8
Content-Length: 54
Caseprovider-Credentials: <snip>
Caseprovider-Credentialshash: <snip>
Caseprovider-Apiversion: 15
Connection: close
No supported action 'SomeName' available for 'SomeValue'
Having a 'watch' on the variables doesn't seem to show where I might obtain this from (and quite possibly something simple that I have overlooked)
Have eventually found a resolution for the; where 'result' contains the content from the process; there's more to do, but this is the basics of what I needed.
using (var httpClient = new HttpClient())
{
httpClient.BaseAddress = new Uri(myWebSite);
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/xml"));
StringContent stringContent = new StringContent(myXMLData);
stringContent.Headers.ContentType = new MediaTypeHeaderValue("text/xml");
HttpResponseMessage httpResponseMessage = httpClient.PostAsync(httpClient.BaseAddress, stringContent).Result;
string result = httpResponseMessage.Content.ReadAsStringAsync().Result;
}
System.Net.WebRequest req = System.Net.WebRequest.Create(URL);
req.Proxy = null;
System.Net.WebResponse resp = req.GetResponse();
System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream());
string result = sr.ReadToEnd().Trim();
I have this code which makes a GET request on my URL and returns the JSON data. However, I also need to get the header values from it.
Example output of the URL is the following:
Content-Type: application/json
Content-Language: en
Expires: Sat, 01 Jan 2000 00:00:00 GMT
Vary: Cookie, Accept-Language
Pragma: no-cache
Cache-Control: private, no-cache, no-store, must-revalidate
Set-Cookie: csrftoken=66161e4f97cbf771199ff78cfeea835e; expires=Sat, 20-Feb-2016 06:49:03 GMT; Max-Age=31449600; Path=/
Set-Cookie: mid=VOgqXwABAAHBumwiwEqLc2ScukeD; expires=Fri, 16-Feb-2035 06:49:03 GMT; Max-Age=630720000; Path=/
Connection: close
Content-Length: 108
{"status":"ok","shift":18,"header":"638wprvx7lg5Um0dZzBAKfjIkML12ChQ","edges":100,"iterations":10,"size":42}
Using my code, I can get the last JSON data returned, but I also need the headers. How can I do that? Thanks.
You can use Headers property of HttpRequest
Ref
resp.Headers
to get the headers for the response.
The HttpWebRequest has a built in property called Headers.
Please have a look at the MSDN page here:
https://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.headers(v=vs.110).aspx
At the bottom of the page you'll find a very simpe code example that should get you started!
I have a worker role on Azure. Every two hours, i download products from 3 different affiliate company.
First time, when the job runs, it's works perfect. The next time the job should run, I get from one affiliate, "The request was aborted: The request was canceled." The 2 others works perfect.
It's not just once, every time. I have ask this affiliate company, but there is no problem. So it must be my code. I have this to download json doc:
using (var Client = new WebClient())
{
Client.Headers.Add("X-API-KEY", Key);
Data = Client.DownloadString(URL);
}
What have I missed?
UPDATE 1:
i have try this:
HttpWebRequest Req = (HttpWebRequest)WebRequest.Create(URL);
Req.KeepAlive = false;
Req.Headers.Add("X-API-KEY", Key);
Req.Method = "GET";
using (var Resp = Req.GetResponse())
{
using (var Reader = new StreamReader(Resp.GetResponseStream()))
{
Data = Reader.ReadToEnd();
}
}
Same problem.
UPDATE 2
Request 1
GET https://se.#####.com/1/stores.json HTTP/1.1
X-API-KEY: x.............N
Host: se.#####.com
Connection: Close
Response 1
HTTP/1.1 200
Server: nginx
Date: Mon, 08 Jun 2015 14:56:39 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: close
Set-Cookie: ci_session=..............; expires=Mon, 08-Jun-2015 16:56:39 GMT; Max-Age=7200; path=/
e30
{"status":true,"data":[................]}
0
Request 2
GET https://se.#####.com/1/stores.json HTTP/1.1
X-API-KEY: x.............N
Host: se.#####.com
Connection: Close
Response 2
HTTP/1.1 200
Server: nginx
Date: Mon, 08 Jun 2015 15:06:29 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: close
Set-Cookie: ci_session=..................; expires=Mon, 08-Jun-2015 17:06:29 GMT; Max-Age=7200; path=/
e30
{"status":true,"data":[.....................]}
0
UPDATE 3
[TestMethod]
public void DownloadTest()
{
Test();
Test();
Test();
}
private static void Test()
{
const string merchantsUrl = "https://se.#####.com/1/stores.json";
string Data;
var Req = (HttpWebRequest)WebRequest.Create(merchantsUrl);
Req.KeepAlive = false;
Req.Headers.Add("X-API-KEY", ".....");
Req.Method = "GET";
using (var Resp = Req.GetResponse())
{
using (var Reader = new StreamReader(Resp.GetResponseStream()))
{
Data = Reader.ReadToEnd();
}
}
}
Change the order of requests and see if the request to same company is failing?
By default WebClient opens a connection as KeepAlive which might be causing this issue. So try explicitly mentioning that KeepAlive mode is false.
Capture the request details for the first time and second time in fiddler or similar tools which could give you more details in tracking down the issue.
Hi I'm trying to send the following JSON string to AppEngine server. The string looks as following:
{"param2":50.0,"param1":50.0,"additionalParams":{"param3":"123","userID":"1234561"}}
And the code that I use for sending it is below:
public async Task<string> SendJSONData(string urlToCall, string JSONData)
{
// server to POST to
string url = urlToCall;
// HTTP web request
var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentType = "action";
httpWebRequest.Method = "POST";
// Write the request Asynchronously
using (var stream = await Task.Factory.FromAsync<Stream>(httpWebRequest.BeginGetRequestStream,
httpWebRequest.EndGetRequestStream, null))
{
//create some json string
string json = JSONData;
// convert json to byte array
byte[] jsonAsBytes = Encoding.UTF8.GetBytes(json);
// Write the bytes to the stream
await stream.WriteAsync(jsonAsBytes, 0, jsonAsBytes.Length);
}
WebResponse response = await httpWebRequest.GetResponseAsync();
StreamReader requestReader = new StreamReader(response.GetResponseStream());
String webResponse = requestReader.ReadToEnd();
return webResponse;
}
I've sniffed what is being sent to the server, using Fiddler:
POST http://server.appspot.com/method HTTP/1.1
Accept: */*
Content-Length: 85
Accept-Encoding: identity
Content-Type: action
User-Agent: NativeHost
Host: server.appspot.com
Connection: Keep-Alive
Cache-Control: no-cache
Pragma: no-cache
{"param2":50.0,"param1":50.0,"additionalParams":{"param3":"123","userID":"1234561"}}
Please mind that I've expeimented with "Content-Type" parameter, setting it to both "text/plain" and "application/json".
Still the answer from the server looks like this:
HTTP/1.1 500 Internal Server Error
Date: Wed, 20 Feb 2013 18:54:34 GMT
Content-Type: text/html; charset=UTF-8
Server: Google Frontend
Content-Length: 466
<html><head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>500 Server Error</title>
</head>
<body text=#000000 bgcolor=#ffffff>
<h1>Error: Server Error</h1>
<h2>The server encountered an error and could not complete your request.<p>If the problem persists, please report your problem and mention this error message and the query that caused it.</h2>
What should I do, to receive the desired "OK" response?
Ok so the problem was the lack of "action" parameter in my POST.
Workaround looks like this:
// Write the request Asynchronously
using (var stream = await Task.Factory.FromAsync<Stream>
(httpWebRequest.BeginGetRequestStream,httpWebRequest.EndGetRequestStream, null))
{
//create some json string
string json = "action="+JSONData;
// convert json to byte array
byte[] jsonAsBytes = Encoding.UTF8.GetBytes(json);
// Write the bytes to the stream
await stream.WriteAsync(jsonAsBytes, 0, jsonAsBytes.Length);
}