From 69a207d029d8f6391caca4848d787a5c47ced4d7 Mon Sep 17 00:00:00 2001
From: XieHan <XieHan@sogou-inc.com>
Date: Thu, 28 Jan 2021 23:25:14 +0800
Subject: [PATCH 1/2] Http redirect supports relative URI. (RFC 7231)

---
 src/factory/HttpTaskImpl.cc | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/factory/HttpTaskImpl.cc b/src/factory/HttpTaskImpl.cc
index bb0aae56..43c2d56a 100644
--- a/src/factory/HttpTaskImpl.cc
+++ b/src/factory/HttpTaskImpl.cc
@@ -277,6 +277,24 @@ bool ComplexHttpTask::redirect_url(HttpResponse *client_resp)
 			return false;
 		}
 
+		if (url[0] == '/')
+		{
+			if (url[1] != '/')
+			{
+				if (uri_.port)
+				{
+					url = uri_.port + url;
+					url = ":" + url;
+				}
+
+				url = uri_.host + url;
+				url = "//" + url;
+			}
+
+			url = ":" + url;
+			url = uri_.scheme + url;
+		}
+
 		URIParser::parse(url, uri_);
 		return true;
 	}

From eb5ff6d443f19ac961338b1576164ea7ccf81d2c Mon Sep 17 00:00:00 2001
From: XieHan <XieHan@sogou-inc.com>
Date: Thu, 28 Jan 2021 23:37:54 +0800
Subject: [PATCH 2/2] simplify code

---
 src/factory/HttpTaskImpl.cc | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/src/factory/HttpTaskImpl.cc b/src/factory/HttpTaskImpl.cc
index 43c2d56a..8baba64c 100644
--- a/src/factory/HttpTaskImpl.cc
+++ b/src/factory/HttpTaskImpl.cc
@@ -282,17 +282,12 @@ bool ComplexHttpTask::redirect_url(HttpResponse *client_resp)
 			if (url[1] != '/')
 			{
 				if (uri_.port)
-				{
-					url = uri_.port + url;
-					url = ":" + url;
-				}
+					url = ':' + (uri_.port + url);
 
-				url = uri_.host + url;
-				url = "//" + url;
+				url = "//" + (uri_.host + url);
 			}
 
-			url = ":" + url;
-			url = uri_.scheme + url;
+			url = uri_.scheme + (':' + url);
 		}
 
 		URIParser::parse(url, uri_);