Access a HTML Page Using GET and POST HTTP Methods

Winnovative HTML to PDF Converter allows you to access a HTML page using both GET and POST HTTP Methods. By default the GET method is used by converter to access the HTML page. When you access the page using GET method you can transmit the parameters in query string. When you access the page using the POST method you transmit the parameters in HTTP request form.

When you add one or more items to HtmlToPdfConverterHttpPostFields collection the converter will automatically use the POST HTTP method to access the HTML page to convert.

Code Sample - Access a HTML Page Using GET and POST HTTP Methods

C#
using System;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc;
using Winnovative_Next_AspNetDemo.Models; 
using Winnovative_Next_AspNetDemo.Models.HTML_to_PDF;

// Use Winnovative Namespace
using Winnovative.Pdf.Next;

namespace Winnovative_Next_AspNetDemo.Controllers.HTML_to_PDF
{
    public class GET_and_POST_HTTP_MethodsController : Controller
    {
        public IActionResult Index()
        {
            var model = new GET_and_POST_HTTP_Methods_ViewModel();
            return View(model);
        }

        [HttpPost]
        public ActionResult ConvertHtmlToPdf(GET_and_POST_HTTP_Methods_ViewModel model)
        {
            if (!ModelState.IsValid)
            {
                var errorMessage = ModelStateHelper.GetModelErrors(ModelState);
                throw new ValidationException(errorMessage);
            }

            // Set the license key received after purchase to use the library in licensed mode; leave it commented for demo mode
            // Licensing.LicenseKey = "your-license-key";

            // Create a HTML to PDF converter object with default settings
            HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

            // The POST field names and values are automatically form-urlencoded by the converter
            // Set the EncodeHttpPostFields property to false if they are already encoded by the caller
            // The parameters transmitted in query string when using the GET method must be URL-encoded by the caller

            string param1Name = !string.IsNullOrEmpty(model.Param1Name) ? model.Param1Name : "param1";
            string param1Value = !string.IsNullOrEmpty(model.Param1Value) ? model.Param1Value : "Value1";

            string param2Name = !string.IsNullOrEmpty(model.Param2Name) ? model.Param2Name : "param2";
            string param2Value = !string.IsNullOrEmpty(model.Param2Value) ? model.Param2Value : "Value2";

            string param3Name = !string.IsNullOrEmpty(model.Param3Name) ? model.Param3Name : "param3";
            string param3Value = !string.IsNullOrEmpty(model.Param3Value) ? model.Param3Value : "Value3";

            string param4Name = !string.IsNullOrEmpty(model.Param4Name) ? model.Param4Name : "param4";
            string param4Value = !string.IsNullOrEmpty(model.Param4Value) ? model.Param4Value : "Value4";

            string param5Name = !string.IsNullOrEmpty(model.Param5Name) ? model.Param5Name : "param5";
            string param5Value = !string.IsNullOrEmpty(model.Param5Value) ? model.Param5Value : "Value5";

            string urlToConvert = model.Url;

            if (model.HttpMethod == "Post")
            {
                htmlToPdfConverter.HttpPostFields.Add(param1Name, param1Value);
                htmlToPdfConverter.HttpPostFields.Add(param2Name, param2Value);
                htmlToPdfConverter.HttpPostFields.Add(param3Name, param3Value);
                htmlToPdfConverter.HttpPostFields.Add(param4Name, param4Value);
                htmlToPdfConverter.HttpPostFields.Add(param5Name, param5Value);
            }
            else
            {
                Uri getMethodUri = new Uri(model.Url);

                string query = (getMethodUri.Query.Length > 0 ? "&" : "?") + String.Format("{0}={1}", param1Name, param1Value);
                query += String.Format("&{0}={1}", param2Name, param2Value);
                query += String.Format("&{0}={1}", param3Name, param3Value);
                query += String.Format("&{0}={1}", param4Name, param4Value);
                query += String.Format("&{0}={1}", param5Name, param5Value);

                urlToConvert = model.Url + query;
            }

            // Convert the HTML page to a PDF document in a memory buffer
            byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlToConvert);

            // Send the PDF file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            fileResult.FileDownloadName = "GET_and_POST.pdf";

            return fileResult;
        }
    }
}

See Also