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Send HTTP POST request in .NET
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Closed 9 years ago.
How do you do a Remote HTTP Post (request) in C#?
This is code from a small app I wrote once to post a form with values to a URL. It should be pretty robust.
_formValues is a Dictionary<string,string> containing the variables to post and their values.
// encode form data
StringBuilder postString = new StringBuilder();
bool first=true;
foreach (KeyValuePair pair in _formValues)
{
if(first)
first=false;
else
postString.Append("&");
postString.AppendFormat("{0}={1}", pair.Key, System.Web.HttpUtility.UrlEncode(pair.Value));
}
ASCIIEncoding ascii = new ASCIIEncoding();
byte[] postBytes = ascii.GetBytes(postString.ToString());
// set up request object
HttpWebRequest request;
try
{
request = WebRequest.Create(url) as HttpWebRequest;
}
catch (UriFormatException)
{
request = null;
}
if (request == null)
throw new ApplicationException("Invalid URL: " + url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postBytes.Length;
// add post data to request
Stream postStream = request.GetRequestStream();
postStream.Write(postBytes, 0, postBytes.Length);
postStream.Close();
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
I use this very simple class:
public class RemotePost{
private System.Collections.Specialized.NameValueCollection Inputs
= new System.Collections.Specialized.NameValueCollection() ;
public string Url = "" ;
public string Method = "post" ;
public string FormName = "form1" ;
public void Add( string name, string value ){
Inputs.Add(name, value ) ;
}
public void Post(){
System.Web.HttpContext.Current.Response.Clear() ;
System.Web.HttpContext.Current.Response.Write( "<html><head>" ) ;
System.Web.HttpContext.Current.Response.Write( string .Format( "</head><body onload=\"document.{0}.submit()\">" ,FormName)) ;
System.Web.HttpContext.Current.Response.Write( string .Format( "<form name=\"{0}\" method=\"{1}\" action=\"{2}\" >" ,
FormName,Method,Url)) ;
for ( int i = 0 ; i< Inputs.Keys.Count ; i++){
System.Web.HttpContext.Current.Response.Write( string .Format( "<input name=\"{0}\" type=\"hidden\" value=\"{1}\">" ,Inputs.Keys[i],Inputs[Inputs.Keys[i]])) ;
}
System.Web.HttpContext.Current.Response.Write( "</form>" ) ;
System.Web.HttpContext.Current.Response.Write( "</body></html>" ) ;
System.Web.HttpContext.Current.Response.End() ;
}
}
And you use it thusly:
RemotePost myremotepost = new RemotePost() ;
myremotepost.Url = "http://www.jigar.net/demo/HttpRequestDemoServer.aspx" ;
myremotepost.Add( "field1" , "Huckleberry" ) ;
myremotepost.Add( "field2" , "Finn" ) ;
myremotepost.Post() ;
Very clean, easy to use and encapsulates all the muck. I prefer this to using the HttpWebRequest and so forth directly.
You can use WCF or create a WebRequest
var httpRequest = (HttpWebRequest)WebRequest.Create("http://localhost/service.svc");
var httpRequest.Method = "POST";
using (var outputStream = httpRequest.GetRequestStream())
{
// some complicated logic to create the message
}
var response = httpRequest.GetResponse();
using (var stream = response.GetResponseStream())
{
// some complicated logic to handle the response message.
}
Also System.Net.WebClient
Use the WebRequest.Create() and set the Method property.
Im using the following piece of code for calling webservices using the httpwebrequest class:
internal static string CallWebServiceDetail(string url, string soapbody,
int timeout) {
return CallWebServiceDetail(url, soapbody, null, null, null, null,
null, timeout);
}
internal static string CallWebServiceDetail(string url, string soapbody,
string proxy, string contenttype, string method, string action,
string accept, int timeoutMilisecs) {
var req = (HttpWebRequest) WebRequest.Create(url);
if (action != null) {
req.Headers.Add("SOAPAction", action);
}
req.ContentType = contenttype ?? "text/xml;charset=\"utf-8\"";
req.Accept = accept ?? "text/xml";
req.Method = method ?? "POST";
req.Timeout = timeoutMilisecs;
if (proxy != null) {
req.Proxy = new WebProxy(proxy, true);
}
using(var stm = req.GetRequestStream()) {
XmlDocument doc = new XmlDocument();
doc.LoadXml(soapbody);
doc.Save(stm);
}
using(var resp = req.GetResponse()) {
using(var responseStream = resp.GetResponseStream()) {
using(var reader = new StreamReader(responseStream)) {
return reader.ReadToEnd();
}
}
}
}
This can be easily used to call a webservice
public void TestWebCall() {
const string url =
"http://www.ecubicle.net/whois_service.asmx/HelloWorld";
const string soap =
#"<soap:Envelope xmlns:soap='about:envelope'>
<soap:Body><HelloWorld /></soap:Body>
</soap:Envelope>";
string responseDoc = CallWebServiceDetail(url, soap, 1000);
XmlDocument doc = new XmlDocument();
doc.LoadXml(responseDoc);
string response = doc.DocumentElement.InnerText;
}
HttpWebRequest HttpWReq =
(HttpWebRequest)WebRequest.Create("http://www.google.com");
HttpWebResponse HttpWResp = (HttpWebResponse)HttpWReq.GetResponse();
Console.WriteLine(HttpWResp.StatusCode);
HttpWResp.Close();
Should print "OK" (200) if the request was successful
The problem when beginning with high-level language like C#, Java or PHP is that people may have never known how simple the underground is in reality. So here’s a short introduction:
http://reboltutorial.com/blog/raw-http-request/
Related
I have an ASP.NET Web API 2 Project. I am trying to read Google Captcha from the form.
I tried this Code:
public string Post(FoundingRequest model)
{
var response = Request["g-recaptcha-response"];
string secretKey = "my key";
var client = new WebClient();
var result = client.DownloadString(
$"https://www.google.com/recaptcha/api/siteverify?secret={secretKey}&response={response}");
var obj = JObject.Parse(result);
model.Captcha = (bool)obj.SelectToken("success");
....
}
but I am receiving an Error on the first line:
Cannot apply indexing with [] to an expression of type
'HttpRequestMessage'
why? and how to solve it? thank you
That method's body for me works fine:
const string secretKey = "YOUR KEY";
string responseFromServer = "";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://www.google.com/recaptcha/api/siteverify?secret=" + secretKey + "&response=" + response);
using (WebResponse resp = req.GetResponse())
using (Stream dataStream = resp.GetResponseStream())
{
if (dataStream != null)
{
using (StreamReader reader = new StreamReader(dataStream))
{
// Read the content.
responseFromServer = reader.ReadToEnd();
}
}
}
dynamic jsonResponse = new JavaScriptSerializer().DeserializeObject(responseFromServer);
return jsonResponse == null || bool.Parse(jsonResponse["success"].ToString());
Update
Regarding the comment, it can be checked on the client side
var response = window.grecaptcha.getResponse()
And then pass this variable to Web API
This is part of my client script:
if (typeof window.grecaptcha != 'undefined') {
var capResponse = window.grecaptcha.getResponse();
if (!capResponse || capResponse.length === 0) {
user.isCaptchaPassed = false;
//alert("Captcha not Passed");
return false;
}
user.gReCaptcha = capResponse;
}
"user" is JS object created before, which passed through JS to server. (AJAX call)
Here's how I did it. I don't use the ChallangeTs so I didn't bother
trying to figure out why it wasn't converting to DateTime properly.
Maybe someone else has that solved.
public class ReCaptchaResponse
{
public bool Success;
public string ChallengeTs;
public string Hostname;
public object[] ErrorCodes;
}
[HttpPost]
[Route("captcha")]
public bool Captcha([FromBody] string token)
{
bool isHuman = true;
try
{
string secretKey = ConfigurationManager.AppSettings["reCaptchaPrivateKey"];
Uri uri = new Uri("https://www.google.com/recaptcha/api/siteverify" +
$"?secret={secretKey}&response={token}");
HttpWebRequest request = WebRequest.CreateHttp(uri);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = 0;
HttpWebResponse response = (HttpWebResponse) request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader streamReader = new StreamReader(responseStream);
string result = streamReader.ReadToEnd();
ReCaptchaResponse reCaptchaResponse = JsonConvert.DeserializeObject<ReCaptchaResponse>(result);
isHuman = reCaptchaResponse.Success;
}
catch (Exception ex)
{
Trace.WriteLine("reCaptcha error: " + ex);
}
return isHuman;
}
I found the answer, I created a hidden input with a certain name and updated its value on Captcha call back. Code:
<input type="hidden" value="" id="recaptcha" name="recaptcha" />
<div class="g-recaptcha" data-callback="imNotARobot" data-sitekey="key"></div>
and the Javascript is:
<script type="text/javascript">
var imNotARobot = function () {
$("#recaptcha").val(grecaptcha.getResponse());
};
</script>
server side:
public string Recaptcha { get; set; }
and the model binder does all the work.
I assume this request is coming from a form, change this:
var response = Request["g-recaptcha-response"];
To this:
var response = Request.Form["g-Recaptcha-Response"];
Also Change this:
var result = client.DownloadString($"https://www.google.com/recaptcha/api/siteverify?secret={secretKey}&response={response}");
To this:
var result = client.DownloadString(string.Format("https://www.google.com/recaptcha/api/siteverify?secret={0}&response={1}", secretKey, response));
I am trying to use C# to create a Journal entry in Quickbooks Online V3 API.
Things I have done:
Check JSON Values and format
Checked Header and accept.
Header info:
Accept : application/json
Authorization : OAuth oauth_token="************",oauth_nonce="cfc36792-8f9a-4202-9fec-be0a610eed8e",oauth_consumer_key="************",oauth_signature_method="HMAC-SHA1",oauth_timestamp="1435189421",oauth_version="1.0",oauth_signature="***"
Content-Length : 642
Content-Type : application/json
Host : qb.sbfinance.intuit.com
//till here everything is fine not sure about last two lines..
//not sure should i add this to my header or not..
X-NewRelic-ID : UQMAU15RGwcAUllSDwc=
X-NewRelic-Transaction : PxQAVVRUCgMIUiRXdHMBICETGlUDChAHHEAPVgoPBgILU3xUciMFJCEUG0MDUwFVAV1WVBVs
My code:
public static void Main()
{
// JournalEndPoint lnew = new JournalEndPoint();
// string Json=lnew.CreateJournal();
string consumerKey = "***";
string consec = "***";
string appkeysec1 = "***";
string appkey1 = "***";
string returnvalue = ExecuteV3Query(consumerKey, consec, appkey1, appkeysec1, "1397754725", "select * from employee where active=TRUE");
}
public static string ExecuteV3Query(string consumerKey, string consumerSecret, string accessToken, string accessTokenSecret, string CompanyId, string query)
{
string encodedQuery = RestSharp.Contrib.HttpUtility.UrlEncode(query);
string uri = string.Format("https://quickbooks.api.intuit.com/v3/company/{0}/journalentry", CompanyId, encodedQuery);
HttpWebRequest httpWebRequest = WebRequest.Create(uri) as HttpWebRequest;
httpWebRequest.Method = "POST";
string JSonvalue = CreateUserJson();
httpWebRequest.ContentType = "application/json";
httpWebRequest.Accept = "application/json";
httpWebRequest.Headers.Add("Authorization", GetDevDefinedOAuthHeader(consumerKey, consumerSecret, accessToken, accessTokenSecret, httpWebRequest, null));
//HttpWebResponse httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse;
/*
* using (Stream data = httpWebResponse.GetResponseStream())
{
//return XML response
return new StreamReader(data).ReadToEnd();
}
*/
var result = "";
HttpWebResponse httpResponse;
try
{
httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
result = streamReader.ReadToEnd();
}
}
catch (WebException e)
{
Console.WriteLine("This program is expected to throw WebException on successful run." +
"\n\nException Message :" + e.Message);
if (e.Status == WebExceptionStatus.ProtocolError)
{
Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
using (Stream data = e.Response.GetResponseStream())
using (var reader = new StreamReader(data))
{
string text = reader.ReadToEnd();
Console.WriteLine(text);
result = text;
}
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
return result;
}
GetDevDefineHeader() will create header and return type is string.
In your url, I do not see the use of encoded query and why are you passing it?
Please check the docs for correct endpoints for CRUD and query operations-
https://developer.intuit.com/docs/api/accounting/JournalEntry
See this example for GET using dev defined-
https://gist.github.com/IntuitDeveloperRelations/0913b4c224de758fde0a
Similarly there is a post example here, you can write similarly for JE-
//string res = CreateV3Customer(consumerKey, consumerSecret, accessToken, accessTokenSecret, realmId);
public string CreateV3Customer(string consumerKey, string consumerSecret, string accessToken, string accessTokenSecret, string realmId)
{
StringBuilder request = new StringBuilder();
StringBuilder response = new StringBuilder();
var requestBody = "{\"FamilyName\":\"Jack\"}";
HttpWebRequest httpWebRequest = WebRequest.Create("https://quickbooks.api.intuit.com/v3/company/"+realmId+"/customer") as HttpWebRequest;
httpWebRequest.Method = "POST";
httpWebRequest.ContentType = "application/json";
httpWebRequest.Headers.Add("Authorization", GetDevDefinedOAuthHeader(consumerKey, consumerSecret, accessToken,accessTokenSecret,httpWebRequest, requestBody));
request.Append(requestBody);
UTF8Encoding encoding = new UTF8Encoding();
byte[] content = encoding.GetBytes(request.ToString());
using (var stream = httpWebRequest.GetRequestStream())
{
stream.Write(content, 0, content.Length);
}
HttpWebResponse httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse;
using (Stream data = httpWebResponse.GetResponseStream())
{
string customerr = new StreamReader(data).ReadToEnd();
return customerr;
}
}
I'm trying to get Google APi's access_token using c# and always getting error message invalid_request. There is my code:
var Params = new Dictionary<string, string>();
Params["client_id"] = GoogleApplicationAPI.CLIENT_ID;
Params["client_secret"] = GoogleApplicationAPI.CLIENT_SECRET;
Params["code"] = "4/08Z_Us0a_blkMlXihlixR1579TYu.smV5ucbI8U4VOl05ti8ZT3ZD4CgMcgI";
Params["redirect_uri"] = GoogleApplicationAPI.RETURN_URL;
Params["grant_type"] = "authorization_code";
var RequestData = "";
foreach (var Item in Params)
{
RequestData += Item.Key + "=" + HttpUtility.UrlEncode(Item.Value) + "&";
}
string Url = "https://accounts.google.com/o/oauth2/token";
var request = (HttpWebRequest) WebRequest.Create(Url);
request.Method = HttpMethod.Post.ToString();
request.ContentType = "application/x-www-form-urlencoded";
var SendData = Encoding.UTF8.GetBytes(RequestData);
try
{
request.ContentLength = SendData.Length;
Stream OutputStream = request.GetRequestStream();
OutputStream.Write(SendData, 0, SendData.Length);
} catch {}
try
{
using (var response = (HttpWebResponse) request.GetResponse())
{
var stream = response.GetResponseStream();
var sr = new StreamReader(stream);
string JSON = sr.ReadToEnd();
}
} catch {}
I use https://developers.google.com/accounts/docs/OAuth2WebServer#offline
Try removing the call to HttpUtility.UrlEncode on each item in the request data. You shouldn't need to do this as the data is not going into the url it's being POSTed. This is no doubt diluting the information being sent which is resulting in your Invalid Request response.
I need to programatically send a form over POST. I have 4 fields, one checkbox and a submit button. how can i go about it?
I use these functions assuming your question is about a forms application.
You can call
HttpPost(
post_url,
"field_name_1", value_1,
"field_name_2", value_2,
...);
Here they are:
public static string HttpPost(string url, params object[] postData)
{
StringBuilder post = new StringBuilder();
for (int i = 0; i < postData.Length; i += 2)
post.Append(string.Format("{0}{1}={2}", i == 0 ? "" : "&", postData[i], postData[i + 1]));
return HttpPost(url, post.ToString());
}
public static string HttpPost(string url, string postData)
{
postData = postData.Replace("\r\n", "");
try
{
WebRequest req = WebRequest.Create(url);
byte[] send = Encoding.Default.GetBytes(postData);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = send.Length;
Stream sout = req.GetRequestStream();
sout.Write(send, 0, send.Length);
sout.Flush();
sout.Close();
WebResponse res = req.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream());
string returnvalue = sr.ReadToEnd();
return returnvalue;
}
catch (Exception ex)
{
Debug.WriteLine("POST Error on {0}\n {1}", url, ex.Message);
return "";
}
}
This should do the trick:
NameValueCollection formData = new NameValueCollection();
formData.Add("field1", "value1");
formData.Add("field2", "value2");
// ... and so on ...
WebClient client = new WebClient();
byte[] result = client.UploadValues("http://www.example.com", formData);
The information, that you have checkboxes or submit buttons is not transferred. It's always name and value.
JQuery $.Post() does exactly that.
I have searched everywhere and have not found an answer to my question. Let me get straight to the point. I have developed an android messaging app for the purpose of experimenting with C2DM. My app get's the registration ID and it gets displayed in my Log correctly. I then send that key through to my C# web service.
The C# Web service then applies for an auth token, which works fine. No problem so far. But, as soon as I POST my body items (registration_id, collapse_key, data.<key>, delay_while_idle) with my header(GoogleLogin auth=[AUTH_TOKEN]) I get the response: "Error=InvalidRegistration".
There is no reason for this not to work. And yes, I have tried every solution available here in stack overflow, but remained unsuccessful. Here is my main code for my server side:
WebRequest theRequest;
HttpWebResponse theResponse;
ArrayList theQueryData;
theRequest = WebRequest.Create("https://www.google.com/accounts/ClientLogin");
theRequest.Method = "POST";
theQueryData = new ArrayList();
String [] test = new String[5];
test[0] = "accountType=HOSTED_OR_GOOGLE";
test[1] = "Email=XXXXXXXXXXXXXXXXX";
test[2] = "Passwd=XXXXXXXXXXXXXXXX";
test[3] = "Source=Domokun";
test[4] = "service=ac2dm";
// Set the encoding type
theRequest.ContentType = "application/x-www-form-urlencoded";
// Build a string containing all the parameters
string Parameters = String.Join("&", (String[])test);
theRequest.ContentLength = Parameters.Length;
// We write the parameters into the request
StreamWriter sw = new StreamWriter(theRequest.GetRequestStream());
sw.Write(Parameters);
sw.Close();
// Execute the query
theResponse = (HttpWebResponse)theRequest.GetResponse();
StreamReader sr = new StreamReader(theResponse.GetResponseStream());
String value = sr.ReadToEnd();
String token = ParseForAuthTokenKey(value);
String value2 = "";
if (value != null)
{
WebRequest theRequest2;
HttpWebResponse theResponse2;
ArrayList theQueryData2;
theRequest2 = WebRequest.Create("http://android.clients.google.com/c2dm/send");
theRequest2.Method = "POST";
theQueryData2 = new ArrayList();
String[] test2 = new String[4];
test[0] = "registration_id=" + registerid;
test[1] = "collapse_key=0";
test[2] = "data.payload=Jannik was hier";
test[3] = "delay_while_idle=0";
// Set the encoding type
theRequest2.ContentType = "application/x-www-form-urlencoded";
// Build a string containing all the parameters
string Parameters2 = String.Join("&", (String[])test2);
theRequest2.ContentLength = Parameters2.Length;
theRequest2.Headers.Add(HttpRequestHeader.Authorization, "GoogleLogin auth=" + token);
// We write the parameters into the request
StreamWriter sw2 = new StreamWriter(theRequest2.GetRequestStream());
sw2.Write(Parameters2);
sw2.Close();
// Execute the query
theResponse2 = (HttpWebResponse)theRequest2.GetResponse();
StreamReader sr2= new StreamReader(theResponse2.GetResponseStream());
value2 = sr2.ReadToEnd();
public static bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true;
}
private static string ParseForAuthTokenKey(string webResponse)
{
string tokenKey = String.Empty;
if (webResponse.Contains(AuthTokenHeader))
{
tokenKey = webResponse.Substring(webResponse.IndexOf(AuthTokenHeader) + AuthTokenHeader.Length);
if (tokenKey.Contains(Environment.NewLine))
{
tokenKey.Substring(0, tokenKey.IndexOf(Environment.NewLine));
}
}
return tokenKey.Trim();
}
All I can think is that my C2DM account isn't registered correctly. Could this be it? Or are there an error in my code that I'm missing?
OK. I've found the solution.
string requestBody = string.Format("registration_id={0}&collapse_key{1}&data.key=value",
HttpUtility.UrlEncode(registrationId), "collapse");
string responseBody = null;
WebHeaderCollection requestHeaders = new WebHeaderCollection();
WebHeaderCollection responseHeaders = null;
requestHeaders.Add(HttpRequestHeader.Authorization, string.Format("GoogleLogin auth={0}", authToken));
httpClient.DoPostWithHeaders(c2dmPushUrl,
requestBody,
"application/x-www-form-urlencoded",
out responseBody,
out responseHeaders,
requestHeaders);
public bool DoPostWithHeaders(string url,
string requestBody,
string contextType,
out string responseBody,
out WebHeaderCollection responseHeaders,
WebHeaderCollection requestHeaders = null)
{
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
// FIRST SET REQUEST HEADERS
httpWebRequest.Headers = requestHeaders;
httpWebRequest.Method = "POST";
// THEN SET CONTENT TYPE - THE ORDER IS IMPORTANT
httpWebRequest.ContentType = contextType;
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] data = encoding.GetBytes(requestBody);
httpWebRequest.ContentLength = data.Length;
stream = httpWebRequest.GetRequestStream();
stream.Write(data, 0, data.Length);
....
....
....
}