Fixed: Parsing of URLs with double slashes in the path

Closes #4005

src/NzbDrone.Common.Test/Http/HttpUriFixture.cs

@@ -8,6 +8,8 @@ namespace NzbDrone.Common.Test.Http
     public class HttpUriFixture : TestBase
     {
         [TestCase("abc://my_host.com:8080/root/api/")]
+        [TestCase("abc://my_host.com:8080//root/api/")]
+        [TestCase("abc://my_host.com:8080/root//api/")]
         public void should_parse(string uri)
         {
             var newUri = new HttpUri(uri);

src/NzbDrone.Common/Http/HttpUri.cs

@@ -8,7 +8,7 @@ namespace NzbDrone.Common.Http
 {
     public class HttpUri : IEquatable<HttpUri>
     {
-        private static readonly Regex RegexUri = new Regex(@"^(?:(?<scheme>[a-z]+):)?(?://(?<host>[-_A-Z0-9.]+)(?::(?<port>[0-9]{1,5}))?)?(?<path>(?:(?:(?<=^)|/)[^/?#\r\n]+)+/?|/)?(?:\?(?<query>[^#\r\n]*))?(?:\#(?<fragment>.*))?$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex RegexUri = new Regex(@"^(?:(?<scheme>[a-z]+):)?(?://(?<host>[-_A-Z0-9.]+)(?::(?<port>[0-9]{1,5}))?)?(?<path>(?:(?:(?<=^)|/+)[^/?#\r\n]+)+/*|/+)?(?:\?(?<query>[^#\r\n]*))?(?:\#(?<fragment>.*))?$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         private readonly string _uri;
         public string FullUri => _uri;