Add unit test for a redirect to an url with query parameters that contain a '+'

Author: JoeMylinn

test/test.cc

@@ -9942,6 +9942,37 @@ TEST(RedirectTest, RedirectToUrlWithQueryParameters) {
   }
 }
 
+TEST(RedirectTest, RedirectToUrlWithPlusInQueryParameters) {
+  Server svr;
+
+  svr.Get("/", [](const Request & /*req*/, Response &res) {
+    res.set_redirect(R"(/hello?key=AByz09+~-._%20%26%3F%C3%BC%2B)");
+  });
+
+  svr.Get("/hello", [](const Request &req, Response &res) {
+    res.set_content(req.get_param_value("key"), "text/plain");
+  });
+
+  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
+  auto se = detail::scope_exit([&] {
+    svr.stop();
+    thread.join();
+    ASSERT_FALSE(svr.is_running());
+  });
+
+  svr.wait_until_ready();
+
+  {
+    Client cli(HOST, PORT);
+    cli.set_follow_location(true);
+
+    auto res = cli.Get("/");
+    ASSERT_TRUE(res);
+    EXPECT_EQ(StatusCode::OK_200, res->status);
+    EXPECT_EQ("AByz09 ~-._ &?ü+", res->body);
+  }
+}
+
 TEST(VulnerabilityTest, CRLFInjection) {
   Server svr;