C# HTTP 发布 Curl 问题

Question

I am trying to post a specific HTTP Post however i am not understanding the conversion for C# to do this correctly, I feel like I am most of the way there but getting stuck along the way

This is what I am trying to send:

curl -i -X POST -H 'Content-Type: application/json' -d '{"text": " Some text or a string in my case a string :tada:"}' http://example.com/hooks/KEYDATA

Should look something like this...

POST /hooks/KEYDATA HTTP/1.1
Host: http://example.com
Content-Type: application/json
Content-Length: 63

Here is what I have....

           async Task sendRequest()
            {
                using var httpClient = new HttpClient();
                using var request = new HttpRequestMessage(new HttpMethod("POST"), 
"https://example.com/hooks/KEYDETAIL");
                request.Headers.TryAddWithoutValidation("Content-Type", "application/json");
                request.Content = new StringContent("{\"text\":\" " + questionCreated + "\" :tada:\"}", 
Encoding.UTF8, "application/json");

                var response = await httpClient.SendAsync(request);
                MessageBox.Show(request.ToString());
            }

Answer 1

You are trying to display the request instead of the response.

The response is of type HttpResponseMessage

You are displaying the request in the message box, not the response. Assuming you want to see the actual response stream, try the following, it reads the content as string:

MessageBox.Show(await response.Content.ReadAsStringAsync());

See also: https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpcontent?view=netcore-3.1

With the HttpResponseMessage you're able to read multiple properties like the headers or status code.

---

In order to debug such things, try to read the responses content and statuscode properties.

Another tip: I noticed you mannualy constructing a JSON string; using NewtonSoft you should be able to do just this:

string jsonstring = JsonConvert.SerializeObject(new { text = "tada" } ); 

---

Another tip, for me usualy the following suffies:

using (var client = new HttpClient())
{
    //no need to set header
    var request = new HttpRequestMessage(new HttpMethod("POST"), "https://example.com/hooks/KEYDETAIL")
    {
        Content = new StringContent(JsonConvert.SerializeObject(yourobject),
                                    Encoding.UTF8, "application/json")
    };

     var response = await httpClient.SendAsync(request);
} 

Answer 2

Your C# code generates a different/invalid json string than you provided in the curl call.

If you take

request.Content = new StringContent("{\"text\":\" " + questionCreated + "\" :tada:\"}", 
    Encoding.UTF8, "application/json");

The resulting string will be (look at the additional " before :tata: ).

{"text":" Some text or a string in my case a string" :tada:"}

instead of

{"text": " Some text or a string in my case a string :tada:"}

Replace it with

request.Content = new StringContent("{\"text\":\" " + questionCreated + " :tada:\"}", 
    Encoding.UTF8, "application/json");