I am trying to implement a RESTful web API on ASP.Net.
To test this Web API I created a small client application, which uses HttpClient.PostAsync.
I add some parameters in a HttpContent object, but whatever I try, I cannot find these posted parameters at server side in my Web API.
Code at client side:
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var customer = new Customer() { FirstName = "test", LastName = "test" };
MediaTypeFormatter jsonFormatter = new JsonMediaTypeFormatter();
HttpContent content = new ObjectContent<Customer>(customer, jsonFormatter);
HttpResponseMessage response = await client.PostAsync(base_url, content);
Code at server side:
string httpMethod = Request.HttpMethod;
if (httpMethod == "POST")
{
string firstName = Request.QueryString["FirstName"];
string lastName = Request.QueryString["LastName"];
}
If I set a breakpoint at server side I see that Request.AcceptTypes is equal to "application/json", so probably the formatting type was received at server side.
However, Request.QueryString is empty all the time and I don't know how to retrieve the posted parameters...
Can anyone help me out?
Thanks in advance!
I found this useful link which helped me out:
http://www.asp.net/web-api/tutorials/hands-on-labs/build-restful-apis-with-aspnet-web-api
That works!
Related
I'm trying to integrate the OneDrive for Busines to a Web Form App.
For this I use the documentation given at this url
In web Form App I have two Pages:
First one is Login page which have a button for login
On login button click I create a GET Request to OneDrive for Business API using the following code:
HttpClient client = new HttpClient();
Redirecturi = Uri.EscapeDataString(Redirecturi);
string url = string.Format("https://login.windows.net/common/oauth2/authorize?response_type=code&client_id={0}&redirect_uri={1}", ClienId, Redirecturi);
var response = client.GetAsync(url);
var json = response.Result.Content.ReadAsStringAsync();
Label2.Text = json.Result;
When I click the login button it takes me to micorosoft login service and sends me back to callback.aspx page with access code (Redirect URI configured on azure)
I got the access code.
On the second page I redeem the access code and make a POST request to get the Authentication token.
Here is the code for the second page:
private string BaseUri="https://login.windows.net/common/oauth2/token";
public string Redirecturi = "http://localhost:51642/CallBack.aspx";
public string ResourcesId = "https://api.office.com/discovery/";
private string ClienId = "180c6ac4-5829-468e-.....-822405804862"; ///truncated//azure
private string ClientSecert = "G4TAQzD8d7C4...OE6m366afv8XKbTCcyXr4=";//truncated
protected void Page_Load(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(Request.QueryString[OAuthConstants.AccessToken]))
{
// There is a token available already. It should be the token flow. Ignore it.
return;
}
if (!string.IsNullOrEmpty(Request.QueryString[OAuthConstants.Code]))
{
string _accessCode = Request.QueryString[OAuthConstants.Code];
HttpClient client = new HttpClient();
// BaseUri = Uri.EscapeDataString(BaseUri);
Redirecturi = Uri.EscapeDataString(Redirecturi);
ResourcesId = Uri.EscapeDataString(ResourcesId);
string url = string.Format("{0}?client_id={1}&redirect_uri={2}&grant_type=authorization_code&client_secret={3}&code={4}&grant_type=authorization_code&resource={5}", BaseUri, ClienId, Redirecturi, ClientSecert, _accessCode, ResourcesId);
var response = client.PostAsync(url, null);
var json = response.Result.Content.ReadAsStringAsync();
Response.Write(json);
}
}
But instead of Response I am get the following error. Which say include the grant_type in url. I have already added (you can check in code).
I get same error the same error without including it.
Here is the error
{"error":"invalid_request","error_description":"AADSTS90014: The request body must contain the following parameter: 'grant_type'.\r\nTrace ID: 2adb3a7f-ceb1-4978-97c4-3dc2d3cc3ad4\r\nCorrelation ID: 29fb11a0-c602-4891-9299-b0b538d75b5f\r\nTimestamp: 2015-07-15 09:58:42Z","error_codes":[90014],"timestamp":"2015-07-15 09:58:42Z","trace_id":"2adb3a7f-ceb1-4978-97c4-3dc2d3cc3ad4","correlation_id":"29fb11a0-c602-4891-9299-b0b538d75b5f","submit_url":null,"context":null}
Please help to know where or what is getting wrong.
Any kind of help will be appreciable
You're adding the parameters to the request querystring. You have to post the data in the request body.
var content = new StringContent(
"grant_type=authorization_code" +
"&client_id=" + ClienId +
"&redirect_uri=" + Redirecturi +
"&client_secret=" + ClientSecert +
"&code=" + _accessCode +
"&resource=" + ResourcesId,
Encoding.UTF8,
"application/x-www-form-urlencoded");
var response = httpClient.PostAsync(BaseUri, content);
var result = response.Result.Content.ReadAsStringAsync();
use FormUrlEncodedContent instead of StringContent (form data post)
var formContent = new FormUrlEncodedContent(new Dictionary<string, string>
{
{ "client_id", clientId },
{ "client_secret", clientSecret },
{ "code", authCode },
{ "redirect_uri", redirectUri },
{ "grant_type", "authorization_code" }
});
var response = await httpClient.PostAsync("https://login.microsoftonline.com/common/oauth2/token", formContent);
Sharing for future readers because this error is not specific to OneDrive only but can arise in other Microsoft tools
I was getting this error when working with Microsoft Bot Framework's Skype bot. In my case the bot file the appId and appSecret was wrongly set to clientId and clientSecret
Changing the same to appId and appSecret fixed the issue.
I have a problem with httpclient in a universal windows phone 8.1 app.
I've been looking but i have not a valid solution in any post.
the problem is that, when i call to the web service first time runs correctly, but when i call it, second or third time, gives me an error 404.
Until you restart the application will not run again.
i need to send that data in a post function cause i want to send a xml formated to string.
my code is very simple:
var handler = new HttpClientHandler
{
Credentials = new
NetworkCredential("user", "pass", "domain")
};
using (var client = new HttpClient(handler))
{
var formContent = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("XMLText", XMLText),
new KeyValuePair<string, string>("param1", "textParam1")
});
HttpResponseMessage response = new HttpResponseMessage();
response = await client.PostAsync(URL, formContent);
var responseString = response.Content.ReadAsStringAsync().Result;
MessageDialog msgbox = new MessageDialog(responseString);
await msgbox.ShowAsync();
}
and my web service is even simpler:
[WebMethod]
public String SetEnvioXML(string XMLText, string param1)
{
return XMLText;
}
Any solution?
Sorry for my english and thaks for all!
Any help is welcome!
Try to use the below code may be this will works,
First try to run this on Google Rest Client or Post Man
HttpRequestMessage httpRequest = new HttpRequestMessage();
httpRequest.Method = HttpMethod.Post;
httpRequest.RequestUri = URL;
httpRequest.Content = formContent ;
response =await client.SendAsync(httpRequest);
Finally i found the solution, i changed the autentication from windows autentication, to basic autentication in IIS, setting the domain in it. Then i try that:
client = new HttpClient();
var authHeader = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes(string.Format("{0}:{1}", "usuario", "contraseña"))));
client.DefaultRequestHeaders.Authorization = authHeader;
And it rules. Thanks for all of your answers!
I am trying to get facebook page feed ( public posts) which does not require any access token.
here's the url
https://www.facebook.com/feeds/page.php?format=json&id=1393547494231876
when i run this in browser where id= any facebook page id. it returns first 25 public posts in json format.
but when i run this in my code to get json result facebook return a page saying "unsupported browser"
this is my method . i pass it facebook page id to get posts..
public static String GetPosts(string PageId)
{
string id = PageId;
string apilink = "https://www.facebook.com/feeds/page.php?format=json&id=";
HttpWebRequest request = WebRequest.Create(apilink + id) as HttpWebRequest;
request.Method = WebRequestMethods.Http.Get;
request.Accept = "application/json";
request.ContentType = "application/json; charset=utf-8";
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
String result = reader.ReadToEnd();
return result;
}
}
Here's the result that i get in return string
Result Image String
and so on remaining page returned.
Can somebody help me how to get it working??
Update
Found Answer...
I Have To Set User agent to make Facebook think i am a browser..
so just added
request.UserAgent = ".NET Framework";
and i worked.
Thanks to All.
Found Answer... I Have To Set User agent to make Facebook think i am a browser.. so just added request.UserAgent = ".NET Framework"; and i worked. Thanks to All.
Have a question I surpsisingly couldnt find an answer to when searching around.
If I request a users email from facebook like:
var scope = new List<string>();
scope.Add("email");
FbClient.RequestUserAuthorization(scope);
How do I retrieve it? I couldnt find a clear option for this in the FacebookGraph.
Near as I can tell, the FacebookGraph object that is in the examples from DotNetOpenAuth does not support changing the fields that you are receiving. However, since WebRequest that it is prompting is returning a JSON string, you can parse it yourself (or use another JSON parser). That's exactly what I did, using the NewtonSoft.Json.dll:
//as part of the uri for the webrequest, include all the fields you want to use
var request = WebRequest.Create("https://graph.facebook.com/me?fields=email,name&access_token=" + Uri.EscapeDataString(authorization.AccessToken));
using (var response = request.GetResponse())
{
using (var responseStream = response.GetResponseStream())
{
System.IO.StreamReader streamReader = new System.IO.StreamReader(responseStream, true);
string MyStr = streamReader.ReadToEnd();
JObject userInfo = JObject.Parse(MyStr);
//now you can access elements via:
// (string)userInfo["name"], userInfo["email"], userInfo["id"], etc.
}
}
Note that you specify what fields you want sent back as part of the WebRequest URI. The fields that are available can be found at https://developers.facebook.com/docs/reference/api/user/
Using DNOA This answer did it for me.
Just added the following:
var scope = new List<string>();
scope.Add("email");
client.RequestUserAuthorization(scope);
and the following to the facebook graph.
[DataMember(Name = "email")]
public string EMail { get; set; }
What you wrote above appears to be requsting authorization from the user to allow your app to get email back when you query the user's object. To query the user's object you do an HTTP Get on https://graph.facebook.com/me. Try it out in the Graph API explorer tool at https://developers.facebook.com/tools/explorer
I am looking to connect to a web service on a different domain in order to authenticate users. The Web Service itself is a RESTful service, written in Java. Data is passed to and from it in JSON.
I initially tried to connect using jQuery (see below)
function Login()
{
$.ajax({
url: "http://www.externaldomain.com/login/authenticate",
type: "POST",
dataType: "json",
contentType: "application/json",
data: "{'emailAddress':'bob#bob.com', 'password':'Password1'}",
success: LoadUsersSuccess,
error: LoadUsersError
});
}
function LoadUsersSuccess(){
alert(1);
}
function LoadUsersError(){
alert(2);
}
However, when checking on Firebug, this brought up a 405 Method Not Allowed error.
At this stage, as this is the first time I've really worked with web services, I really just wondered whether this was the best way to do things? Is it worth persevering with this method in order to find a solution, or am I best to maybe try and find a server-side answer to this issue? If so, does anyone have any examples they could post up?
Many thanks
Doing cross-domain web service calls in a browser is very tricky. Because it's a potential security vulnerability, browsers block these types of requests. However, there is a workaround called JSONP. If you use JSONP instead of plain JSON, you should be able to make the cross-domain request.
Right ok, to update where I am, I checked in firebug and on the external server and the reason why I'm getting a 405 error is because I'm doing a Get rather than a Post.
What I need to do is send the username and password, then receive a GUID back which will then be used for any future requests. I thought by having 'type:post' in the code would be enough but apparently not. Anyone know where I might be going wrong here? As I said, a novice to web services and nothing I have tried from looking online has had any effect. Many thanks
Ok, I got the problem solved, and I did it by going back to C# and doing it there instead of using jQuery or JSONP and I used Json.Net for handling the data received. Here is the code:
protected void uxLogin_Click(object sender, EventArgs e)
{
StringBuilder data = new StringBuilder();
data.Append("{");
data.Append("'emailAddress': '" + uxEmail.Text + "', ");
data.Append("'password': '" + uxPassword.Text + "'");
data.Append("}");
byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());
string url = System.Configuration.ConfigurationManager.AppSettings["AuthenticationURL"].ToString();
string JSONCallback = string.Empty;
Uri address = new Uri(url);
// Create the web request
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
// Set type to POST
request.Method = "POST";
request.ContentType = "application/json";
// Create a byte array of the data we want to send
// Set the content length in the request headers
request.ContentLength = byteData.Length;
// Write data
using (Stream postStream = request.GetRequestStream())
{
postStream.Write(byteData, 0, byteData.Length);
}
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
JSONCallback = reader.ReadToEnd().ToString();
}
if (!String.IsNullOrEmpty(JSONCallback))
{
JObject jObject = JObject.Parse(JSONCallback);
if ((bool)jObject["loginResult"] == false)
{
string errorMessage = jObject["errorMessage"].ToString();
int errorCode = (int)jObject["errorCode"];
}
else
{
string idToken = jObject["idToken"].ToString();
Session["Userid"] = idToken;
Response.Redirect("~/MyDetails.aspx");
}
}
else
{
uxReturnData.Text = "The web service request was not successful - no data was returned";
}
}
Thanks anyway :)