Web API : always showing message content type must be application/json

Hi friends,

I am trying to get the data from API using post method.It has Http headers and json parameters.

Tested API in the postman it is working.

In the development, the response status is showing success and status code is 200 (ok) but the responsemessage always showing content type must be application/json.I tested with diiferent ways to get the data.

Please check the following code :

HttpClient client = new HttpClient();
client.BaseAddress = new Uri("apiurl");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json");
client.DefaultRequestHeaders.TryAddWithoutValidation("Cache-control", "no-cache");
var json = new person() { fromdate = "01/08/2020", todate = "20/08/2020", locationcode= "1234", accessKey= "12345" };
var request = new HttpRequestMessage(HttpMethod.Post, "apiurl")
{
Content = new StringContent(JsonConvert.SerializeObject(json), Encoding.UTF8, "application/json")
};
var response = client.SendAsync(request).Result;
if (response.ReasonPhrase == "OK")
{
var responseContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
}

I added header and parameters like this also

client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

I tried by adding headers to request also but result is not getting fron the API.

request.Content = new StringContent("{\"fromdate\":\"01/08/2020\",\"todate\":\"20/08/2020\",\"locationcode\":\"1234\",\"accessKey\":\"12345\"}",
Encoding.UTF8,
"application/json");

Always showing content type must be application/json.

Please help me on this how to get the data from API.

4 Replies

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prasanna p6y ago
yes Nisha Regil,I tested in Postman it is working properly in the postman and getting data from the API.
Nisha Regil6y ago
Then, I believe that it is because your API is getting called but not returning proper JSON value.
Have you tried executing it in Postman?
prasanna p6y ago
Hi Nisha Regil,

I did the same process but not working.It is showing success but data is not getting from the API.

I wrote like this
if (response.ReasonPhrase == "OK")
{
var responseContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
}

and I tried with : var responseContent =await response.Content.ReadAsStringAsync().Result
also.
Nisha Regil6y ago
Please refer to below link, May be it will help.
https://www.c-sharpcorner.com/article/calling-web-api-using-httpclient/