diff --git a/vlib/net/http/http_proxy.v b/vlib/net/http/http_proxy.v
index 39cfa5f6908765..e2fd53334e73f4 100644
--- a/vlib/net/http/http_proxy.v
+++ b/vlib/net/http/http_proxy.v
@@ -38,10 +38,15 @@ pub fn new_http_proxy(raw_url string) !&HttpProxy {
 	if port == 0 {
 		if scheme == 'https' {
 			port = 443
+			host += ':' + port.str()
 		} else if scheme == 'http' {
 			port = 80
+			host += ':' + port.str()
 		}
 	}
+	if port == 0 {
+		return error("Unknown port")
+	}
 
 	return &HttpProxy{
 		scheme: scheme
@@ -73,17 +78,19 @@ fn (pr &HttpProxy) build_proxy_headers(request &Request, host string, path strin
 		uheaders << '${key}: ${val}\r\n'
 	}
 	uheaders << request.build_request_cookies_header()
-	if pr.username != '' {
-		mut authinfo := ''
+	if ['http', 'https'].contains(pr.scheme) {
+		if pr.username != '' {
+			mut authinfo := ''
 
-		authinfo += pr.username
-		if pr.password != '' {
-			authinfo += ':${pr.password}'
-		}
+			authinfo += pr.username
+			if pr.password != '' {
+				authinfo += ':${pr.password}'
+			}
 
-		encoded_authinfo := base64.encode(authinfo.bytes())
+			encoded_authinfo := base64.encode(authinfo.bytes())
 
-		uheaders << 'Proxy-Authorization: Basic ${encoded_authinfo}\r\n'
+			uheaders << 'Proxy-Authorization: Basic ${encoded_authinfo}\r\n'
+		}
 	}
 
 	version := Version.v1_1