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How to replicate Postman POST request in C#

I'm fairly new to .NET's HTTPClient class, hence kindly excuse if I sounded noob. I'm tryin to replicate Postman's POST request in C# .Net and written following code. However I'm not getting any response but StatusCode: 404. Could someone assist understanding where I'm going wrong?
Also I'd like to understand, how do set Body in following code.
var httpClient = new HttpClient
{
BaseAddress = new Uri("https://testURL.com"),
Timeout = TimeSpan.FromMinutes(10)
};
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("audio/wav"));
httpClient.DefaultRequestHeaders.Add("Authorization", "Basic ldjfdljfdlfjdsjfdsl");
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("model", "Test"),
});
var result = httpClient.PostAsync("api/v1/recognize", content).Result;
Here is what I'm doing in Postman and it works:

"Params" in Postman refers to query parameters which are appended to the URL. You'll see that the URL in Postman contains the parameters you added in the "Params" tab:
However, it seems those are just dummy values you've entered so perhaps you don't need them? In any case, the way you add query parameters to the request for HttpClient is a little different as it needs to be added to the URL.
After that you also need to add the audio file as content to your request. At the moment you're setting the "Accept" header to "audio/wav" but you probably want to set the "Content-Type" header instead (or are you expecting a WAV file to be returned in the response too?).
As far as I can see this is what you're missing:
using (var httpClient = new HttpClient())
{
httpClient.Timeout = TimeSpan.FromMinutes(10);
// Set request headers
httpClient.DefaultRequestHeaders.Add("Authorization", "Basic ldjfdljfdlfjdsjfdsl");
// Set query parameters
var uriBuilder = new UriBuilder("https://testURL.com/api/v1/recognize");
uriBuilder.Query = "model=Test";
// Build request body
// Read bytes from the file being uploaded
var fileBytes = File.ReadAllBytes(wavFilePath);
// Create request content with metadata/headers to tell the
// backend which type of data (media type) is being uploaded
var byteArrayContent = new ByteArrayContent(fileBytes);
byteArrayContent.Headers.ContentType = MediaTypeHeaderValue.Parse("audio/wav");
// Wrap/encode the content as "multipart/form-data"
// See example of how the output/request looks here:
// https://dotnetfiddle.net/qDMwFh
var requestContent = new MultipartFormDataContent
{
{byteArrayContent, "audio", "filename.wav"}
};
var response = await httpClient.PostAsync(uriBuilder.Uri, requestContent);
}
I haven't tested this of course against your application, but it should be something along the lines of this. It might be that the backend doesn't expect "multipart/form-data" and just needs the "audio/wav". I can't see the output headers in your Postman screenshots, but if so, you can use byteArrayContent directly instead of wrapping it in MultipartFormDataContent.
Note: Don't use httpClient.PostAsync(...).Result. If you want to use the asynchronous method, you should await it. Depending on your code, using Result might give you problems if you're not careful. And remember to dispose the HttpClient after use (easiest solution is to use a using statement). If you plan on reusing the HttpClient for more requests, you can avoid disposing it until you're done.

"Pass through" controller action (gets and returns JSON) in .NET Core 3.1

Someone's probably done this before but I can't seem to formulate the question properly to find results. I want to make AJAX calls from a view, but I can't directly call the external API from javascript because there's a key that I can't expose. My idea is to have another controller action that I call from the page that calls the actual external REST API I want to get data from and just passes it on as a JSON. I see lots of examples of getting a JSON through C# and deserializing it but not many where you get a JSON and then return it and consume it from the view. Any help appreciated.
public JsonResult GetStuff()
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(URL);
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = client.GetAsync("Stuff/?Id=" + id).Result;
*code to take response and pass it on as a JSON that I can consume from Javascript
}

Here is what I recommend.
[HttpGet("myapi/{id}");
public async Task MyApi(int id) {
// Replace these lines as needed to make your API call properly.
using HttpClient client = new() {
BaseAddress = REMOTE_SERVER_BASE
}
// Make sure to properly encode url parameters if needed
using HttpResponseMessage response = await client.GetAsync($"myapi/{id}");
this.HttpContext.Response.StatusCode = (int)response.StatusCode;
foreach (KeyValuePair<string, IEnumerable<string>> header in response.Headers) {
this.HttpContext.Response.Headers[header.Key] = new StringValues(header.Value.ToArray());
}
await response.Content.CopyToAsync(this.HttpContext.Response.Body);
}
This will copy all the common response fields such as status code, headers, and body content, over to your response.
This code isn't tested so you might have to tweak it a bit but it should be enough to get you started.

ACUMATICA: I want to invoke a simple API when a field is updated

I am trying to invoke a simple web request (restful API) when a specific field is updated in Acumatica (when one field in Contact entity is updated on the screen), I know where exactly to put the code, I guess here:
protected void Contact_RowUpdated(PXCache cache, PXRowUpdatedEventArgs e)
{
var row = (Contact)e.Row;
}
How do I invoke this web request, and how can I access the value of a certain custom field from the contact entity?
I tried the following code:
System.Net.Http.HttpClient client = new System.Net.Http.HttpClient();
client.BaseAddress = new System.Uri("....");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(
new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
var res = await client.PostAsync(
"", new System.Net.Http.StringContent("...", System.Text.Encoding.UTF8, "application/json"));
But I've got an error that HttpClient doesn't exist in System.Net.Http namespace.

using (var client = new HttpClient(new HttpClientHandler())

I used System.Net.WebClient instead at the end.

Can JSON be sent with HttpClient in C# using the PATCH verb?

I am working with an API that requires a call with the PATCH verb. I am trying to issue a request using the HttpClient object in C#. The request sends, however the JSON is not present in the body. Instead it is blank. Relevant code below.
var patch = new HttpMethod("PATCH");
var http = new HttpRequestMessage(patch, "https://apiendpoint");
var content = new StringContent(json, Encoding.UTF8, "application/json");
http.Content = content;
var result = client.SendAsync(http).Result;
This is my first time using SendAsync, so perhaps I am missing something else that needs to be set on the HttpRequestMessage?

Delete email using mailinator API

I am creating application to access public emails in mailinator. I can view emails but I have difficulties when I am trying to delete them.
https://mailinator.com/apidocs.jsp all examples from documentacion worked except this one.
I have code to POST Http request:
using (var client = new HttpClient())
{
var values = new Dictionary<string, string>
{
{ "msgid", id}
};
var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync("https://api.mailinator.com/api/delete?", content);
var responseString = await response.Content.ReadAsStringAsync();
}
Only error it throws is (405) Method Not Allowed. or Method is not supported by this URL.
So I guess either my url that I'm sending is bad, either my code.
I need some help to figure it out.

According to the API docs you need to pass a valid token with every call. The delete API example looks like this:
curl "https://api.mailinator.com/api/delete?id=1373143878-0-test22&token=..."
The elipsis (...) there needs to be a valid token. So, add the token to your values dictionary.