StreamReader reads \u00fc but Postman reads OK - unicode

Question

Probably duplicate question but I couldn't find an answer for my problem. I have this code to call a web service:
var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://172.21.122.1:5001/autocomplete");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
//tried this too: httpWebRequest.Accept = "gzip, deflate";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
streamWriter.Write("{ \"message\" : \"mü\" }");
streamWriter.Flush();
streamWriter.Close();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
response = "";
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
response = streamReader.ReadToEnd();
}
But no matter what Encoding I tried with StreamReader() c'tor, I get this response or worse: {"words":["m\u00fc\u015fteri","m\u00fc\u015fterisiyim""]}
When I use Postman or SoapUI to call the same service with the same request: {"message": "mü"},
response looks ok: {"words": ["müşteri","müşterisiyim"]}
Strange thing is: The same code works OK with many other services. It is only this specific service that the reponse is not correctly encoded. We believe there is a programming error with the service, but what I wonder is how Postman or SoapUI handles this. There should be a control in their code and if the response contains "\uxxxx", then Postman or SoapUI decodes it again.
I've checked all request / response headers in Postman and SoapUI with no luck. What can be the reason?

Answer 1

You have to make sure that your request is encoded correctly:
Set the Content Type to:
httpWebRequest.ContentType = "application/json;charset=UTF-8";
Check if request body is also UTF-8 encoded. Set the StreamWriter encoding to UTF-8 as well:
...
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream(), Encoding.UTF8))
...
If you are getting the request content from other source, make sure to read it also using UTF-8 encoding.

Answer 2

Regex.Unescape(response) worked like a charm, thanks JosefZ!