And back to HTTP 403 for Bad URI (we are refusing to fulfill the request)

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPClient.java

@@ -163,7 +163,7 @@ public class I2PTunnelHTTPClient extends I2PTunnelHTTPClientBase implements Runn
             "The request uses a bad protocol. " +
             "The I2P HTTP Proxy supports http:// requests ONLY. Other protocols such as https:// and ftp:// are not allowed.<BR>").getBytes();
     private final static byte[] ERR_BAD_URI =
-                                ("HTTP/1.1 404 Bad URI\r\n" +
+                                ("HTTP/1.1 403 Bad URI\r\n" +
             "Content-Type: text/html; charset=iso-8859-1\r\n" +
             "Cache-control: no-cache\r\n" +
             "\r\n" +

installer/resources/proxy/baduri-header.ht

@@ -1,4 +1,4 @@
-HTTP/1.1 404 Bad URI
+HTTP/1.1 403 Bad URI
 Content-Type: text/html; charset=UTF-8
 Cache-control: no-cache
 Connection: close