Can't download HTML data from https URL using htmlagilitypack

c# html html-agility-pack https web-scraping

Question

I have a "small" problem htmlagilitypack(HAP). When I tried to get data from a website I get this error:

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll

Additional information: 'gzip' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.

I'm using this piece of code to get the data from the website:

HtmlWeb page = new HtmlWeb();
var url = "https://kat.cr/";
var data = page.Load(url);

After this code i get that error. I tried everything from the google but nothing helped.

Can someone tell me how to resolve this problem ?

Thank you

Accepted Answer

HtmlWeb doesn't support downloading from https. So instead, you can use WebClient with a bit of modification to automatically decompress GZip :

class MyWebClient : WebClient
{
    protected override WebRequest GetWebRequest(Uri address)
    {
        HttpWebRequest request = base.GetWebRequest(address) as HttpWebRequest;
        request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
        return request;
    }
}

Then use HtmlDocument.LoadHtml() to populate your HtmlDocument instance from HTML string :

var url = "https://kat.cr/";
var data = new MyWebClient().DownloadString(url);
var doc = new HtmlDocument();
doc.LoadHtml(data);

Popular Answer

You can intercept the request when using HtmlWeb to modify it based on your requirements.

var page = new HtmlWeb()
{
  PreRequest = request =>
  {
    // Make any changes to the request object that will be used.
    request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
    return true;
  }
};

var url = "https://kat.cr/";
var data = page.Load(url);


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