How to remove PROTOCOL from URI

Question

how can I remove the protocol from URI? i.e. remove HTTP

Answer 1

You can use this the System.Uri class like this:

System.Uri uri = new Uri("http://stackoverflow.com/search?q=something");
string uriWithoutScheme = uri.Host + uri.PathAndQuery + uri.Fragment;

This will give you stackoverflow.com/search?q=something

Edit: this also works for about:blank :-)

Answer 2

The best (and to me most beautiful) way is to use the Uri class for parsing the string to an absolute URI and then use the GetComponents method with the correct UriComponents enumeration to remove the scheme:

Uri uri;
if (Uri.TryCreate("http://stackoverflow.com/...", UriKind.Absolute, out uri))
{
    return uri.GetComponents(UriComponents.AbsoluteUri &~ UriComponents.Scheme, UriFormat.UriEscaped);
}

For further reference: the UriComponents enumeration is a decorated with the FlagsAttribute, so bitwise operations (eg. & and |) can be used on it. In this case the &~ removes the bits for UriComponents.Scheme from UriComponents.AbsoluteUri using the AND operator in combination with the bitwise complement operator.

Answer 3

In the general sense (not limiting to http/https), an (absolute) uri is always a scheme followed by a colon, followed by scheme-specific data. So the only safe thing to do is cut at the scheme:

    string s = "http://stackoverflow.com/questions/4517240/";
    int i = s.IndexOf(':');
    if (i > 0) s = s.Substring(i + 1);

In the case of http and a few others you may also want to .TrimStart('/'), but this is not part of the scheme, and is not guaranteed to exist. Trivial example: about:blank.

Answer 4

You could use the RegEx for this. The below sample would meet your need.

    using System;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      string txt="http://www.google.com";

      string re1="((?:http|https)(?::\\/{2}[\\w]+)(?:[\\/|\\.]?)(?:[^\\s\"]*))";    // HTTP URL 1

      Regex r = new Regex(re1,RegexOptions.IgnoreCase|RegexOptions.Singleline);
      Match m = r.Match(txt);
      if (m.Success)
      {
            String httpurl1=m.Groups[1].ToString();
            Console.Write("("+httpurl1.ToString()+")"+"\n");
      }
      Console.ReadLine();
    }
  }
}

Let me know if this helps

Answer 5

It's not the most beautiful way, but try something like this:

var uri = new Uri("http://www.example.com");
var scheme = uri.Scheme;
var result = uri.ToString().SubString(scheme.Length + 3);