Basic web API usage

Steve Mason Finally got back to this and yes, if I change to use https in PoastMan, then it works. Yay!

But...

My program still fails at the same point as before. It's certainly something silly and obvious I'm doing wrong and I'm just blind to it. Here's my code:
 

        public static async Task<string> GetSessionTokenAsync(string server)
        {
            string port = "55293";
            string url = $"https://{server}:{port}/api/getSessionToken";
            string[] historians = new string[1];
            historians[0] = server;

            var requestBody = new
            {
                apiToken = CanaryApiToken,
                historians = historians,
                clientId = "WebServiceCollector"
            };

            string json = JsonSerializer.Serialize(requestBody);
            Console.WriteLine($"Request URL: {url}\n       Body: {json}");
            HttpContent content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

            HttpResponseMessage response = await client.PostAsync(url, content); // <-- This call fails
            response.EnsureSuccessStatusCode();

            Console.WriteLine($"Response: {response.StatusCode}");

            string responseBody = await response.Content.ReadAsStringAsync();
            var responseData = JsonSerializer.Deserialize<Dictionary<string, string>>(responseBody);

            return responseData["userToken"];
        }

Here's the output (with URLs and tokens x'd out):
 

Request URL: https://xxxx.xxxx.xxxx.com:55293/api/getSessionToken
       Body: {"apiToken":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx","historians":["xxxx.xxxx.xxxx.com"],"clientId":"WebServiceCollector"}
Unhandled exception. System.Net.Http.HttpRequestException: Response status code does not indicate success: 400 (Bad Request).
   at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
   at WebServiceCollector.CanaryService.GetSessionTokenAsync(String server) in C:\Users\alistair.frith\source\repos\WebServiceCollector\WebServiceCollector\CanaryService.cs:line 45
   at WebServiceCollector.Worker.PutData(WeatherData weatherData) in C:\Users\alistair.frith\source\repos\WebServiceCollector\WebServiceCollector\Worker.cs:line 83
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_1(Object state)
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

What's my silly mistake?

Steve Mason Fantastic, thank you, I knew it would be a silly mistake! I can now get a session token.

But...  when I then try to use that session token to write a value into Canary, I get a 400 (Bad Request) error.

Again, here's my code (I appreciate you are not a coder Steve but it might hlp someone else diagnose my latest silly mistake):

        public static async Task SendWeatherDataAsync(string server, string sessionToken, string path, WeatherData weatherData)
        {
            string port = "55293";
            string url = $"https://{server}:{port}/api/v1/sendData";
            var requestBody = new
            {
                apiToken = sessionToken,
                data = new[]
                {
                new
                {
                    tag = $"{path}.CloudCover",
                    timestamp = DateTime.UtcNow.ToString("o"),
                    value = weatherData.Clouds.All
                }
            }
            };

            string json = JsonSerializer.Serialize(requestBody);
            Console.WriteLine($"Request URL: {url}\n       Body: {json}");
            HttpContent content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

            HttpResponseMessage response = await client.PostAsync(url, content);
            Console.WriteLine($"Response: {response.StatusCode}");
            response.EnsureSuccessStatusCode();
        }

And here's the output:

Request URL: https://xxxx.xxxx.xxxx.com:55293/api/v1/sendData
       Body: {"apiToken":"20250218152449402_xxxxxxxxxxxx","data":[{"tag":"WeatherData.MyCompany.CloudCover","timestamp":"2025-02-18T15:24:49.4112972Z","value":19}]}
Response: BadRequest
Unhandled exception. System.Net.Http.HttpRequestException: Response status code does not indicate success: 400 (Bad Request).
   at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
   at WebServiceCollector.CanaryService.SendWeatherDataAsync(String server, String sessionToken, String path, WeatherData weatherData) in C:\Users\alistair.frith\source\repos\WebServiceCollector\WebServiceCollector\CanaryService.cs:line 88
   at WebServiceCollector.Worker.PutData(WeatherData weatherData) in C:\Users\alistair.frith\source\repos\WebServiceCollector\WebServiceCollector\Worker.cs:line 90
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_1(Object state)
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

I've got the "v1" in the URL and I'm using https. Maybe the tag path is wrong? or the whole "data" serialisation? Do I need the "servers" in there again? 
 

alistair. frith Hmm, looking at the API reference at Canary Labs | Store and Forward Web API Documentation I should be using storeData, not sendData. Not sure where I got sendData from! 

alistair. frith Ok, I've got data being written to Canary from my C# app through the web API. But I now have 2 more issues:
1. Unless I leave several minutes between writes, canary gives me a 400 (Bad Request) error. If I only store new values every 10 minutes then it's fine but at 5 minutes I get this error. What can cause that?
2.  When I write a new value to a tag, another value, the same as the previous value but with a "No Data (0x8000)" status gets written to the tag with a timestamp a fraction of a second after the previous value. What can cause that?