Sure! Here's an updated version of the web API code that uses HTTP POST instead of GET:

using System;
using System.Net;
using System.Net.Http;
using System.Web.Http;

namespace CalculatorAPI
{
    public class CalculatorController : ApiController
    {
        [HttpPost]
        [Route("api/calculator/add")]
        public IHttpActionResult Add([FromBody] CalculationRequest request)
        {
            int result = request.Num1 + request.Num2;
            return Ok(result);
        }

        [HttpPost]
        [Route("api/calculator/subtract")]
        public IHttpActionResult Subtract([FromBody] CalculationRequest request)
        {
            int result = request.Num1 - request.Num2;
            return Ok(result);
        }

        [HttpPost]
        [Route("api/calculator/divide")]
        public IHttpActionResult Divide([FromBody] CalculationRequest request)
        {
            if (request.Num2 == 0)
            {
                return BadRequest("Cannot divide by zero.");
            }

            int result = request.Num1 / request.Num2;
            return Ok(result);
        }
    }

    public class CalculationRequest
    {
        public int Num1 { get; set; }
        public int Num2 { get; set; }
    }
}
In this updated code, the methods are decorated with the [HttpPost] attribute instead of [HttpGet]. The calculation parameters are now passed in the request body using the [FromBody] attribute and are deserialized into a CalculationRequest object.

To use this API, you can send HTTP POST requests to the respective endpoints (api/calculator/add, api/calculator/subtract, api/calculator/divide) with the calculation parameters in the request body as JSON. For example:

POST /api/calculator/add
Content-Type: application/json

{
    "num1": 5,
    "num2": 3
}
This will perform the addition operation and return the result.

Remember to set up a web server and configure routing to run this web API. You can use frameworks like ASP.NET Web API or ASP.NET Core for building and hosting the API.
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