--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/goodjava/webserver/Response.java	Tue Sep 17 01:35:01 2019 -0400
@@ -0,0 +1,85 @@
+package goodjava.webserver;
+
+import java.io.InputStream;
+import java.io.PrintWriter;
+import java.util.Map;
+import java.util.LinkedHashMap;
+import java.util.Collections;
+import java.util.List;
+
+
+public class Response {
+	public final String protocol = "HTTP/1.1";
+	public volatile Status status = Status.OK;
+	public final Map<String,Object> headers = Collections.synchronizedMap(new LinkedHashMap<String,Object>());
+	{
+		headers.put("server","Goodjava");
+	}
+	private static final Body empty = new Body(0,new InputStream(){
+		public int read() { return -1; }
+	});
+	public volatile Body body = empty;
+
+	public static class Body {
+		public final long length;
+		public final InputStream content;
+	
+		public Body(long length,InputStream content) {
+			this.length = length;
+			this.content = content;
+		}
+	}
+
+
+	public void addHeader(String name,String value) {
+		Util.add(headers,name,value);
+	}
+
+	public void setCookie(String name,String value,Map<String,String> attributes) {
+		StringBuilder buf = new StringBuilder();
+		buf.append( Util.urlEncode(name) );
+		buf.append( '=' );
+		buf.append( Util.urlEncode(value) );
+		for( Map.Entry<String,String> entry : attributes.entrySet() ) {
+			buf.append( "; " );
+			buf.append( entry.getKey() );
+			buf.append( '=' );
+			buf.append( entry.getValue() );
+		}
+		addHeader( "Set-Cookie", buf.toString() );
+	}
+
+
+	public String toHeaderString() {
+		StringBuilder sb = new StringBuilder();
+		sb.append( protocol )
+			.append( ' ' ).append( status.code )
+			.append( ' ' ).append( status.reason )
+			.append( "\r\n" )
+		;
+		for( Map.Entry<String,Object> entry : headers.entrySet() ) {
+			String name = entry.getKey();
+			Object value = entry.getValue();
+			if( value instanceof List ) {
+				for( Object v : (List)value ) {
+					sb.append( name ).append( ": " ).append( v ).append( "\r\n" );
+				}
+			} else {
+				sb.append( name ).append( ": " ).append( value ).append( "\r\n" );
+			}
+		}
+		sb.append( "\r\n" );
+		return sb.toString();
+	}
+
+
+	public static Response errorResponse(Status status,String text) {
+		Response response = new Response();
+		response.status = status;
+		response.headers.put( "content-type", "text/plain; charset=utf-8" );
+		PrintWriter writer = new PrintWriter( new ResponseOutputStream(response) );
+		writer.write( text );
+		writer.close();
+		return response;
+	}
+}