How to set large string inside HttpContent when using HttpClient?

Question

So, I created a HttpClient and am posting data using HttpClient.PostAsync().

I set the HttpContent using

HttpCo

Answer 1

FormUrlEncodedContent internally uses Uri.EscapeDataString : from reflection, I can see that this method has constants limiting the size of request length.

A possible solution is to create a new implementation of FormUrlEncodedContent by using System.Net.WebUtility.UrlEncode (.net 4.5) to bypass this limitation.

public class MyFormUrlEncodedContent : ByteArrayContent
{
    public MyFormUrlEncodedContent(IEnumerable> nameValueCollection)
        : base(MyFormUrlEncodedContent.GetContentByteArray(nameValueCollection))
    {
        base.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
    }
    private static byte[] GetContentByteArray(IEnumerable> nameValueCollection)
    {
        if (nameValueCollection == null)
        {
            throw new ArgumentNullException("nameValueCollection");
        }
        StringBuilder stringBuilder = new StringBuilder();
        foreach (KeyValuePair current in nameValueCollection)
        {
            if (stringBuilder.Length > 0)
            {
                stringBuilder.Append('&');
            }

            stringBuilder.Append(MyFormUrlEncodedContent.Encode(current.Key));
            stringBuilder.Append('=');
            stringBuilder.Append(MyFormUrlEncodedContent.Encode(current.Value));
        }
        return Encoding.Default.GetBytes(stringBuilder.ToString());
    }
    private static string Encode(string data)
    {
        if (string.IsNullOrEmpty(data))
        {
            return string.Empty;
        }
        return System.Net.WebUtility.UrlEncode(data).Replace("%20", "+");
    }
}

To send large content, it's better to use StreamContent.