http: add referrer

HTTP/HttpContent.cs

@@ -24,7 +24,7 @@ public struct HttpContent
     public byte[] Content;
 
     /// <summary>
-    /// Converts the contents to a UTF8 string.
+    /// Converts the contents to a UTF-8 string.
     /// </summary>
     public string AsText => Encoding.UTF8.GetString(Content);
 

HTTP/HttpFields.cs

@@ -25,6 +25,8 @@ public record HttpFields
 
     public string? Location { get; set; }
 
+    public string? Referrer { get; set; }
+
     public int? ContentLength { get; set; }
 
     public MIMEType? ContentType { get; set; }
@@ -32,7 +34,7 @@ public record HttpFields
     /// <summary>
     /// Extra fields to include.
     /// </summary>
-    public Dictionary<string, string>? Misc;
+    public readonly Dictionary<string, string> Misc = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
 
     /// <summary>
     /// Sets a field. The string will be parsed for non-string fields like Accept.
@@ -86,6 +88,11 @@ public record HttpFields
                     Location = value;
                     return;
 
+                case "referer":
+                case "referrer":
+                    Referrer = value;
+                    return;
+
                 case "content-length":
                     {
                         if (value == null)
@@ -107,14 +114,9 @@ public record HttpFields
 
                 default:
                     if (value == null)
-                    {
                         Misc?.Remove(key);
-                    }
                     else
-                    {
-                        Misc ??= new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
                         Misc[key] = value;
-                    }
                     return;
             }
         }
@@ -158,6 +160,9 @@ public record HttpFields
         if (Location != null)
             callback("Location", Location);
 
+        if (Referrer != null)
+            callback("Referer", Referrer);
+
         if (WebSocketKey != null)
             callback("Sec-WebSocket-Key", WebSocketKey);
 

HTTP/HttpResponse.cs

@@ -80,14 +80,6 @@ public class HttpResponse
 
         StringBuilder sb = new StringBuilder();
 
-        void writeField(string name, string value)
-        {
-            sb.Append(name);
-            sb.Append(": ");
-            sb.Append(value);
-            sb.Append("\r\n");
-        }
-
         sb.Append("HTTP/1.1 ");
         sb.Append(StatusCode);
         sb.Append(' ');
@@ -105,7 +97,13 @@ public class HttpResponse
             Fields.ContentType = null;
         }
 
-        Fields.EmitAll(writeField);
+        Fields.EmitAll((string name, string value) =>
+        {
+            sb.Append(name);
+            sb.Append(": ");
+            sb.Append(value);
+            sb.Append("\r\n");
+        });
         sb.Append("\r\n");
 
         await stream.Write(Encoding.ASCII.GetBytes(sb.ToString()));