Data not being saved when using the Post method in a Web API

I built a straightforward Web API application that allows users to GET or POST data. The data consists of a simple array of Strings like ["foo", "bar"]. However, when I try to send data using the POST method to the Web API and then make another call to retrieve the data, the previously posted data is no longer there.

How can I retain the data on the server after each POST request?

This is the relevant code snippet from my server:

[HttpPost]
public HttpResponseMessage Post([FromBody]string value)
{
    data.Add(value);
    var msg = Request.CreateResponse(HttpStatusCode.Created, "Added element");
    msg.Headers.Location = new Uri(Request.RequestUri + "/" + (data.Count - 1).ToString());
    return msg;
}

When sending a POST request with data = John Doe, it gets added to a List<String> named data, but it does not persist once I return to the server.

This is how I am making the call to the server:

$.ajax({
    url: url,
    type: 'POST',
    contentType: 'application/json',
    data: JSON.stringify(data), // data = "John Doe"
    success: function (data) {
        console.log(data);
    },
    error: function (data) {
        console.log(data);
    }
});

In essence, how do I ensure that "John Doe" remains stored on the server after sending a POST request, so that the

List<String> data = ["foo", "bar", "John Doe"]
is maintained?

Answer №1

Attempting to use List<String> data =
will not have the desired persistence because this list is instantiated in your API controller and gets destroyed after each request, as a new controller instance is created with every request made.

If you truly want to maintain persistence, consider caching the data using a caching mechanism such as a distributed cache like Redis or a non-distributed one.

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