Access a HTML Page Using GET and POST HTTP Methods

EVO PDF Client for .NET Core

EVO 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

Copy

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

// Use EVO PDF Namespace
using EvoPdfClient;

namespace EvoHtmlToPdfDemo.Controllers
{
    public class GET_and_POST_HTTP_MethodsController : Controller
    {
        // GET: GET_and_POST_HTTP_Methods
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult ConvertHtmlToPdf(IFormCollection collection)
        {
            // Get the server options
            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string servicePassword = collection["textBoxServicePassword"];
            bool useServicePassword = servicePassword.Length > 0;
            bool useTcpService = collection["ServerType"] == "radioButtonUseTcpService";
            string webServiceUrl = collection["textBoxWebServiceUrl"];

            // Create the HTML to PDF converter object
            HtmlToPdfConverter htmlToPdfConverter = null;
            if (useTcpService)
                htmlToPdfConverter = new HtmlToPdfConverter(serverIP, serverPort);
            else
                htmlToPdfConverter = new HtmlToPdfConverter(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                htmlToPdfConverter.ServicePassword = servicePassword;

            // Set license key received after purchase to use the converter in licensed mode
            // Leave it not set to use the converter in demo mode
            htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

            // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
            // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
            htmlToPdfConverter.ConversionDelay = 2;

            string param1Name = collection["param1NameTextBox"][0].Length > 0 ? collection["param1NameTextBox"][0] : "param1";
            string param1Value = collection["param1ValueTextBox"][0].Length > 0 ? collection["param1ValueTextBox"][0] : "Value 1";

            string param2Name = collection["param2NameTextBox"][0].Length > 0 ? collection["param2NameTextBox"][0] : "param2";
            string param2Value = collection["param2ValueTextBox"][0].Length > 0 ? collection["param2ValueTextBox"][0] : "Value 2";

            string param3Name = collection["param3NameTextBox"][0].Length > 0 ? collection["param3NameTextBox"][0] : "param3";
            string param3Value = collection["param3ValueTextBox"][0].Length > 0 ? collection["param3ValueTextBox"][0] : "Value 3";

            string param4Name = collection["param4NameTextBox"][0].Length > 0 ? collection["param4NameTextBox"][0] : "param4";
            string param4Value = collection["param4ValueTextBox"][0].Length > 0 ? collection["param4ValueTextBox"][0] : "Value 4";

            string param5Name = collection["param5NameTextBox"][0].Length > 0 ? collection["param5NameTextBox"][0] : "param5";
            string param5Value = collection["param5ValueTextBox"][0].Length > 0 ? collection["param5ValueTextBox"][0] : "Value 5";

            string urlToConvert = collection["urlTextBox"];

            if (collection["HttpMethod"] == "postMethodRadioButton")
                {
                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(collection["urlTextBox"]);

                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 = collection["urlTextBox"] + 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;
        }
    }
}