Unhandled Exception In HttpClient web api call in asp.net core

Sujeet Raman

5y2.1kLearn iOS Programming

In postman I issue a request with the following body against `http://localhost:2000/api/ProductQuality/Check`:

```json

{

"productid": "2274",

"productcorenumber": "1321",

"value": "AE1C1F-0363-D6F-B3D-AE0029A8",

"contacts": [

15998,

1012

"ispassed": "0",

"isok": "0",

"isgood": "false"

}

```

and this will come to here(I have one method in my controller)

```cs

[HttpPost("api/ProductQuality/Check")]

public async Task Check([FromBody] CheckInput input)

{

var result = await _Checker.Checkercall(input);

}

```

in `Checkercall` implementation I am calling another API(as of now calling the same for testing purposes)

```cs

public async Task Checkercall(CheckInput input)

{

QualityCheckResults QualityCheckInputResult = new QualityCheckResults();

using (var httpClient = new HttpClient())

{

var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");

using (var response = await httpClient.PostAsync("https://localhost:2001/api/ProductQuality/Check", content))

//hope i have to give https here

{

string apiResponse = await response.Content.ReadAsStringAsync();

QualityCheckInputResult = JsonConvert.DeserializeObject(apiResponse);

}

return QualityCheckInputResult;

}

```

I am getting Unhandled Exception here but I couldn't understand the issue.

8 Replies

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Rijwan Ansari5y ago
Always use try - catch and handle exception

sample:
try
{
    HttpResponseMessage response = await client.GetAsync("http://www.ajshdgasjhdgajdhgasjhdgasjdhgasjdhgas.tk/");
    response.EnsureSuccessStatusCode();    // Throw if not a success code.

    // ...
}
catch (HttpRequestException e)
{
    // Handle exception capture.
return new HttpResponseMessage(HttpStatusCode.InternalServerError);
}
Sujeet Raman5y ago
I tried your all methode but i am getting the same error bad request..let me explain what i was trying..I am in asp.net core 3.1

I have 2 solutions here with having diffrent port numbers..

in 1st solution i have a method
[HttpPost("api/Product/Check1st")]
public async Task Check([FromBody] CheckInput input)
{
var result = await _productqualityChecker.CheckQualityAsync(input);
return new JsonResult(result);
}
I will keep running this solution . the url here api/Product/Check1st" i will trying to call using httpclient in 2nd solution.so this url i am not giving in postman .

In my 2nd solution I have a methode [HttpPost("api/ProductQuality/Checkin2nd")]{}

this url i will give to postman and getting the input and then it will call the httpclient as shown as below

In postman I issue a request with the following body against `http://localhost:2000/api/ProductQuality/Check`:

JSON

{
"productid": "2274",
"productcorenumber": "1321",
"value": "AE1C1F-0363-D6F-B3D-AE0029A8",
"contacts": [
15998,
1012
],
"ispassed": "0",
"isok": "0",
"isgood": "false"
}

and this will come to here(I have one method in my controller)
[HttpPost("api/ProductQuality/Checkin2nd")]
public async Task Check([FromBody] CheckInput input)
{
var result = await _Checker.Checkercall(input);
}
in `Checkercall` implementation I am calling another API(as of now calling the same for testing purposes)
public async Task Checkercall(CheckInput input)
{
QualityCheckResults QualityCheckInputResult = new QualityCheckResults();
using (var httpClient = new HttpClient())
{
var content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");
using (var response = await httpClient.PostAsync("https://localhost:2001/api/ProductQuality/Check1st", content))
//hope i have to give https here
{
string apiResponse = await response.Content.ReadAsStringAsync();
QualityCheckInputResult = JsonConvert.DeserializeObject(apiResponse);
}
}
return QualityCheckInputResult;
}
This is what i am trying to do. in httpclient mtd CheckInput is the class i have created .

QualityCheckResults QualityCheckInputResult = new QualityCheckResults(); is the response class.So i can assign to this object only..May be that is the issue? i dont know

Is there anything wrong in my 2 solution call? as i am doing in .net 5,3.1 most of your code are not supporting like request.create response..
Sachin Singh5y ago
haha , no difference , it was just mistake.
Sujeet Raman5y ago
how can i give var response 2 time? what is the diffrence
Sachin Singh5y ago
if you have to return the response then create method as
public HttpResponseMessage Checkercall(Root root)
{
  try
{
using (var httpClient = new HttpClient())
{
var response = httpClient .PostAsync("https://localhost:2001/api/ProductQuality/Check", root);.Result;
  if (response.IsSuccessStatusCode)
                    {
                     return Request.CreateResponse(HttpStatusCode.OK, response);
                    }

               return Request.CreateErrorResponse(HttpStatusCode.NotFound,"No result found");
           }
            }
            catch{
                return new HttpResponseMessage(HttpStatusCode.InternalServerError);
            }

}

}
Salman Beg5y ago
Hey. Share exactly what exception you are getting. Thanks.
Sujeet Raman5y ago
if i do it in a post man

https://localhost:2001/api/ProductQuality/Check with my parameters i am getting some json values as result.input is an argument which will return some json results..i should get that also by doing this in httpclient?
Sachin Singh5y ago
step 1. create a class
public class Root    {
        public string productid { get; set; }
        public string productcorenumber { get; set; }
        public string value { get; set; }
        public List<int> contacts { get; set; }
        public string ispassed { get; set; }
        public string isok { get; set; }
        public string isgood { get; set; }
    }
step 2.create the method as
public int Checkercall(Root root)
{

using (var httpClient = new HttpClient())
{

var response = await httpClient.PostAsync("https://localhost:2001/api/ProductQuality/Check", root);

var response = httpClient .PostAsync("https://localhost:2001/api/ProductQuality/Check", root);.Result;
                    if (response.IsSuccessStatusCode)
                    {
                        return 1;
                    }
return 0;
}
return 0;
}
If this work then your method is returning inappropriate type. BTW , task doesn't return anything.