Add explicit Referer Header

Author: mythz

src/ServiceStack.Text/HttpRequestConfig.cs

@@ -11,6 +11,7 @@ public class HttpRequestConfig
     public string? Accept { get; set; } 
     public string? UserAgent { get; set; } 
     public string? ContentType { get; set; }
+    public string? Referer { get; set; }
     public NameValue? Authorization { get; set; }
     public LongRange? Range { get; set; }
     public List<NameValue> Headers { get; set; } = new();

src/ServiceStack.Text/HttpUtils.HttpClient.cs

@@ -1058,6 +1058,10 @@ public static HttpRequestMessage WithHeader(this HttpRequestMessage httpReq, str
                 throw new NotSupportedException("Can't set ContentType before Content is populated");
             httpReq.Content.Headers.ContentType = new MediaTypeHeaderValue(value);
         }
+        else if (name.Equals(HttpHeaders.Referer, StringComparison.OrdinalIgnoreCase))
+        {
+            httpReq.Headers.Referrer = new Uri(value);
+        }
         else if (name.Equals(HttpHeaders.UserAgent, StringComparison.OrdinalIgnoreCase))
         {
             if (value.IndexOf('/') >= 0)
@@ -1097,6 +1101,8 @@ public static HttpRequestMessage With(this HttpRequestMessage httpReq, Action<Ht
             headers.Add(new(HttpHeaders.UserAgent, config.UserAgent));
         if (config.ContentType != null)
             headers.Add(new(HttpHeaders.ContentType, config.ContentType));
+        if (config.Referer != null)
+            httpReq.Headers.Referrer = new Uri(config.Referer);
         if (config.Authorization != null)
             httpReq.Headers.Authorization =
                 new AuthenticationHeaderValue(config.Authorization.Name, config.Authorization.Value);

src/ServiceStack.Text/HttpUtils.WebRequest.cs

@@ -1126,6 +1126,9 @@ public static HttpWebRequest With(this HttpWebRequest httpReq, Action<HttpReques
         if (config.ContentType != null)
             httpReq.ContentType = config.ContentType;
 
+        if (config.Referer != null)
+            httpReq.Referer = config.Referer;
+
         if (config.Authorization != null)
             httpReq.Headers[HttpHeaders.Authorization] = 
                 config.Authorization.Name + " " + config.Authorization.Value;