HttpResponseMessage.Content.ReasAsString返回一个空字符串

Question

I have a WS that I call like this:

HttpResponseMessage response = await client.PostAsync(url, new StringContent(json));

the WS will throw an Exception (Forbidden) and in my Blazor application that made the PostAsync call, I will get an HttpResponseMessage with response code 405, not sure why its 405, it should be 403 (Postman returns 403).

I have enabled CORS ( ServiceStack code):

Plugins.Add(new CorsFeature(allowedOrigins: "*",
  allowedMethods: "GET, POST, PUT, DELETE, OPTIONS",
  allowedHeaders: "*",
  allowCredentials: true));

This is some Console.Writeline I did, just before the PostAsync:

Failed to load resource: the server responded with a status of 405 ()

** UPDATED **

This are the two methods:

    public async Task<TResponse> PostAsync<TResponse, TRequest>(string requestUri, TRequest request)
    {
        string url = GetUrl(requestUri);
        Console.WriteLine("URI: " + url);
        string json = JsonConvert.SerializeObject(request);
        Console.WriteLine($"{url} | {json}");
        HttpResponseMessage response = await client.PostAsync(url, new StringContent(json));
        return await GetResponseOrThrowHttpException<TResponse>(response);
    }


    private async Task<T> GetResponseOrThrowHttpException<T>(HttpResponseMessage response)
    {
        Console.WriteLine($"GetResponseOrThrowHttpException: {response.StatusCode}");
        string responseString = await response.Content.ReadAsStringAsync();
        Console.WriteLine($"GetResponseOrThrowHttpException ContentStringResult: |{responseString}|");
        if (!response.IsSuccessStatusCode)
        {
            Newtonsoft.Json.Linq.JObject jsonObject = Newtonsoft.Json.Linq.JObject.Parse(responseString);
            string responseStatusString = jsonObject["ResponseStatus"].ToString();

            Console.WriteLine($"GetResponseOrThrowHttpException 4: {responseStatusString}");
            ResponseStatus responseStatus = JsonConvert.DeserializeObject<ResponseStatus>(responseStatusString);
            Console.WriteLine($"Throwing HttpException: {response.StatusCode} {responseStatus.Message}");
            throw new HttpException(response.StatusCode, responseStatus.Message);
        }
        return JsonConvert.DeserializeObject<T>(responseString);
    }

When I try to get the string value of the response, it is empty:

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

and the responseString is an empty (length 0) string.

If I run the exact same request in Postman, I get a valid response:

So, the response JSON, seen at the bottom in the image above, is what I want to work with in the Blazor app, and parse it as a JSON object and move on from there. I also note that I get here a 403 error, which I expected, and in the Blazor app, I get a 405.

Is this a CORS issue even though I have enabled CORS on the WS side?

Answer 1

I guess your content should be posted like that:

new StringContent(json, Encoding.UTF8, "application/json")

Even if this is not the cause of your suffering, it's better to use this so...

Hope this helps...

Answer 2

Verify that you have setup proper CORS configuration for the domain. Looks like you made call to another domain:port combination from your Blazor application. Even if this C#, all security rules inside browser still applies.