I've created a simple API in ASP.NET Core using C#. Now, I want to call that API which has an endpoint that takes a long string containing the description, which can also have special characters, using the application/x-www-form-urlencoded POST method. Let's discuss how we can do that in ASP.NET Core.
Considering that our content-type is "application/x-www-form-urlencoded", we must ensure that the POST body is properly encoded, especially if it contains special characters like '&' or '+', which have a special meaning in a form.
We can achieve this by passing our string through HttpUtility.UrlEncode before writing it to the request stream, this function will encode special characters in a way that is safe for passing in a URL.
using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
public class HttpWebRequestExample
{
public void SendRequest()
{
// Create the request object
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.quickpickdeal.com/api/Employee/GetAllEmployee");
// Set the request method
request.Method = "POST";
// Set the content type
request.ContentType = "application/x-www-form-urlencoded";
// Create the data to be sent in the content body
string postData = "name=" + HttpUtility.UrlEncode("value1") + "&phonenumber=" + HttpUtility.UrlEncode("value2") + "&data_with_ampersand=" + HttpUtility.UrlEncode("value&with&ersand");
// Convert the string to a byte array
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the content length
request.ContentLength = byteArray.Length;
// Get the request stream and write the data to it
using (Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
// Get the response from the server
using (WebResponse response = request.GetResponse())
{
// Process the response
// Your code here...
}
}
}
Above code ensures that our POST body is properly encoded, making it safe for transmission in a URL and preventing any issues with special characters like '&', '+' or any special character.
Sending Passing Special Character in Content Body with C# HttpWebRequest
When using HttpWebRequest in C# to send data of type "application/x-www-form-urlencoded", we may encounter difficulties in sending the Special character in the content body, this is because the Special character like '&' character is a reserved character in URL encoding, and if not properly encoded, it can be misinterpreted as a separator between key-value pairs.
To properly send the '&' character in the content body, we need to URL encode it before adding it to the request.
using System;
using System.IO;
using System.Net;
using System.Text;
public class HttpWebRequestExample
{
public void SendRequest()
{
// Create the request object
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.quickpickdeal.com/);
// Set the request method
request.Method = "POST";
// Set the content type
request.ContentType = "application/x-www-form-urlencoded";
// Create the data to be sent in the content body
string postData = "id=value1&name=value2&data_with_ampersand=" + Uri.EscapeDataString("ashok&with&ersand");
// Convert the string to a byte array
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the content length
request.ContentLength = byteArray.Length;
// Get the request stream and write the data to it
using (Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
// Get the response from the server
using (WebResponse response = request.GetResponse())
{
}
}
}
In above code snippet, we properly encode the '&' character in the content body using Uri.EscapeDataString() method. This ensures that the '&' character is treated as part of the value and not as a separator between key-value pairs.With this approach, we can successfully send the '&' character in the content body of a HttpWebRequest with type "application/x-www-form-urlencoded".
Considering that our content-type is "application/x-www-form-urlencoded", we must ensure that the POST body is properly encoded, especially if it contains special characters like '&' which have a special meaning in a form.
This function allows you to post form data to a specified API endpoint and deserialize the response content into the specified TResult type.
First, install the "Microsoft ASP.NET Web API Client" NuGet package:PM > Install-Package Microsoft.AspNet.WebApi.Client
Then, you can use the following function to post your data:
public static async Task<TResult> PostFormData<TResult>(string apiUrl, IEnumerable<KeyValuePair<string, string>> formData)
{
using (var client = new HttpClient())
{
using (var content = new FormUrlEncodedContent(formData))
{
content.Headers.Clear();
content.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
HttpResponseMessage response = await client.PostAsync(apiUrl, content);
return await response.Content.ReadAsAsync<TResult>();
}
}
}
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