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HttpClient post returns bad request in c#, works in postman

I'm trying to access a rest endpoint, https://api.planet.com/auth/v1/experimental/public/users/authenticate. It is expecting json in the request body.
I can get the request to work in Postman but not using c#. Using postman I get the expected invalid email or password message but with my code I get "Bad Request" no matter I try.
Here is the code that makes the request
private void Login()
{
try
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri("https://api.planet.com/");
client.DefaultRequestHeaders.Accept.Clear();
//ClientDefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*"));
Data.User user = new Data.User
{
email = "myemail#company.com",
password = "sdosadf"
};
var requestMessage = JsonConvert.SerializeObject(user);
var content = new StringContent(requestMessage, Encoding.UTF8, "application/json");
var response = client.PostAsync("auth/v1/experimental/public/users/authenticate", content).Result;
Console.WriteLine(response.ToString());
}
catch (WebException wex )
{
MessageBox.Show(wex.Message) ;
}
}
class User
{
public string email;
public string password;
}
Here are screen grabs form Postman that are working

The way to get this to work was to alter the content header "content-type". By default HTTPClient was creating content-type: application/json;characterset= UTF8. I dropped and recreated the content header without the characterset section and it worked.
content.Headers.Remove("Content-Type");
content.Headers.Add("Content-Type", "application/json");

The issue is you are trying to call an async method without waiting for the response using await method or var task = method; task.Wait() Therefore, when you end up doing response.ToString() it returns the text you are seeing.
One way to handle this within a non-async method would be to do the following:
var task = client.PostAsync("auth/v1/experimental/public/users/authenticate", content);
task.Wait();
var responseTask = task.Content.ReadAsStringAsync();
responseTask.Wait();
Console.WriteLine(responseTask.Result);
Another way is to make the current method async by doing private async void Login() and then do:
var postResp = await client.PostAsync("auth/v1/experimental/public/users/authenticate", content);
var response = await postResp.Content.ReadAsStringAsync();
Console.WriteLine(response);

Create a Method Like this...
static async Task<string> PostURI(Uri u, HttpContent c)
{
var response = string.Empty;
var msg = "";
using (var client = new HttpClient())
{
HttpResponseMessage result = await client.PostAsync(u, c);
msg = await result.Content.ReadAsStringAsync();
if (result.IsSuccessStatusCode)
{
response = result.StatusCode.ToString();
}
}
return response;
}
call In your Method
public void Login()
{
string postData ="{\"email\":\"your_email\",\"password\":\"your_password\"}";
Uri u = new Uri("yoururl");
var payload = postData;
HttpContent c = new StringContent(payload, Encoding.UTF8,"application/json");
var t = Task.Run(() => PostURI(u, c));
t.Wait();
Response.Write(t.Result);
}

Even with a successful access Token I get a 401 unauthorized in my Get() async method?

Currently I have to async methods Post() & Get(). For my Post() method is returning a access token and if you look at the bottom of my post method I am calling my Get() in there also, for the simple reason of being able to call string result in my get. but even with a successful access token I Keep getting a 401 unauthorized Status code, why?
Click to view error in VS
namespace APICredential.Controllers
{
[RoutePrefix("api")]
public class ValuesController : ApiController
{
[HttpGet, Route("values")]
public async Task<string> Post()
{
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri("https://api.elliemae.com/oauth2/");
var parameters = new Dictionary<string, string>()
{
{"grant_type", "password"}, //Gran_type Identified here
{"username", "admin#encompass:BE11200822"},
{"password", "Shmmar****"},
{"client_id", "gpq4sdh"},
{"client_secret", "dcZ42Ps0lyU0XRgpDyg0yXxxXVm9#A5Z4ICK3NUN&DgzR7G2tCOW6VC#HVoZPBwU"},
{"scope", "lp"}
};
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "v1/token")
{
Content = new FormUrlEncodedContent(parameters)
};
HttpResponseMessage response = await client.SendAsync(request);
string resulted = await response.Content.ReadAsStringAsync();
await Get(resulted);
return resulted;
}
}
[HttpGet, Route("values/get")]
public async Task<string> Get(string resulted)
{
string res = "";
using (var client = new HttpClient())
{
// HTTP POST
client.BaseAddress = new Uri("https://api.elliemae.com/");
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var response = client.GetAsync("/encompass/v1/loans/{ea7c29a6-ee08-4816-99d2-fbcc7d15731d}?Authorization=Bearer "+resulted+"&Content-Type=application/json").Result;
using (HttpContent content = response.Content)
{
// ... Read the string.
Task<string> result = content.ReadAsStringAsync();
res = result.Result;
}
}
return res;
}

The following is missing:
client.DefaultRequestHeaders.Add("Authorization", "Bearer " + Accesstoken);
This is your default header once you insert this then you have premission to getstring data from whatever your URL is...
code will look like this:
public async Task<string> Get(string Accesstoken)
{
string res = "";
using (var client = new HttpClient())
{
Accesstoken = Accesstoken.Substring(17, 28);
client.BaseAddress = new Uri("https://api.elliemae.com/");
client.DefaultRequestHeaders.Add("Authorization", "Bearer " + Accesstoken);
var response = client.GetAsync("encompass/v1/loans/ea7c29a6-ee08-4816-99d2-fbcc7d15731d").Result;
using (HttpContent content = response.Content)
{
// ... Read the string.
Task<string> result = content.ReadAsStringAsync();
res = result.Result;
}

JSON data not shown in DataGridView

My application uses a list like this :
async Task<object> GetBanktAsync(string path)
{
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync(path);
object result;
if (response.IsSuccessStatusCode)
{
result = response.Content.ReadAsAsync<object>().Result;
}
var deserializeObject = Newtonsoft.Json.JsonConvert.DeserializeObject<result>(resultString);
dataGridViewBank.DataSource = deserializeObject;
}
Using the GET method to show banks from the DB in the DataGridview but it doesn't show anything. Why?

c# convert html content into string with utf8 encoding in win 10 universal app

I want to encode the HTML content with UTF-8.
The Code I already have:
public async Task<string> MakeWebRequest()
{
HttpClient http = new HttpClient();
HttpResponseMessage response = await http.GetAsync(**URL**);
return await response.Content.ReadAsStringAsync();
}
Thanks for your help and time.
Dieter

I don't know in which encoding the original string comes but try the following code:
public async Task<string> MakeWebRequest()
{
var http = new HttpClient();
var buffer = await http.GetBufferAsync(**URL**);
var responseString = Encoding.UTF8.GetString(buffer.ToArray(), 0, (int)(buffer.Length- 1));
return responseString;
}
or
public async Task<string> MakeWebRequest()
{
var http = new HttpClient();
var response = await http.GetByteArrayAsync(**URL**);
var responseString = Encoding.UTF8.GetString(response, 0, response.Length - 1);
return responseString;
}

How do I set up HttpContent for my HttpClient PostAsync second parameter?

public static async Task<string> GetData(string url, string data)
{
UriBuilder fullUri = new UriBuilder(url);
if (!string.IsNullOrEmpty(data))
fullUri.Query = data;
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.PostAsync(new Uri(url), /*expects HttpContent*/);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
return responseBody;
}
The PostAsync takes another parameter that needs to be HttpContent.
How do I set up an HttpContent? There Is no documentation anywhere that works for Windows Phone 8.
If I do GetAsync, it works great! but it needs to be POST with the content of key="bla", something="yay"
//EDIT
Thanks so much for the answer... This works well, but still a few unsures here:
public static async Task<string> GetData(string url, string data)
{
data = "test=something";
HttpClient client = new HttpClient();
StringContent queryString = new StringContent(data);
HttpResponseMessage response = await client.PostAsync(new Uri(url), queryString );
//response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
return responseBody;
}
The data "test=something" I assumed would pick up on the api side as post data "test", evidently it does not. On another matter, I may need to post entire objects/arrays through post data, so I assume json will be best to do so. Any thoughts on how I get post data through?
Perhaps something like:
class SomeSubData
{
public string line1 { get; set; }
public string line2 { get; set; }
}
class PostData
{
public string test { get; set; }
public SomeSubData lines { get; set; }
}
PostData data = new PostData {
test = "something",
lines = new SomeSubData {
line1 = "a line",
line2 = "a second line"
}
}
StringContent queryString = new StringContent(data); // But obviously that won't work

This is answered in some of the answers to Can't find how to use HttpContent as well as in this blog post.
In summary, you can't directly set up an instance of HttpContent because it is an abstract class. You need to use one the classes derived from it depending on your need. Most likely StringContent, which lets you set the string value of the response, the encoding, and the media type in the constructor. See: http://msdn.microsoft.com/en-us/library/system.net.http.stringcontent.aspx

To add to Preston's answer, here's the complete list of the HttpContent derived classes available in the standard library:
Credit: https://pfelix.wordpress.com/2012/01/16/the-new-system-net-http-classes-message-content/
There's also a supposed ObjectContent but I was unable to find it in ASP.NET Core.
Of course, you could skip the whole HttpContent thing all together with Microsoft.AspNet.WebApi.Client extensions (you'll have to do an import to get it to work in ASP.NET Core for now: https://github.com/aspnet/Home/issues/1558) and then you can do things like:
var response = await client.PostAsJsonAsync("AddNewArticle", new Article
{
Title = "New Article Title",
Body = "New Article Body"
});
Update:
For framework versions 5+, via:
using System.Net.Http.Json
Without any imports, you can just use use:
await client.PostAsJsonAsync("url", new { });

public async Task<ActionResult> Index()
{
apiTable table = new apiTable();
table.Name = "Asma Nadeem";
table.Roll = "6655";
string str = "";
string str2 = "";
HttpClient client = new HttpClient();
string json = JsonConvert.SerializeObject(table);
StringContent httpContent = new StringContent(json, System.Text.Encoding.UTF8, "application/json");
var response = await client.PostAsync("http://YourSite.com/api/apiTables", httpContent);
str = "" + response.Content + " : " + response.StatusCode;
if (response.IsSuccessStatusCode)
{
str2 = "Data Posted";
}
return View();
}