Tried to address awkward API issue when append query parameters.

Author: glynos

test/uri_builder_test.cpp

@@ -758,3 +758,25 @@ TEST(builder_test, non_const_non_array_string_literals_should_work) {
     ;
   ASSERT_EQ("http://example.com/foo", builder.uri());
 }
+
+TEST(builder_test, set_multiple_query_with_encoding) {
+  network::uri_builder builder;
+  builder
+    .scheme("http")
+    .host("example.com")
+    .append_query("q1=foo bar")
+    .append_query("q2=biz baz")
+    ;
+  ASSERT_EQ("http://example.com?q1=foo%20bar&q2=biz%20baz", builder.uri().string());
+}
+
+TEST(builder_test, set_multiple_query_with_encoding_2) {
+  network::uri_builder builder;
+  builder
+    .scheme("http")
+    .host("example.com")
+    .append_query_key_value_pair("q1", "foo bar")
+    .append_query_key_value_pair("q2", "biz baz")
+    ;
+  ASSERT_EQ("http://example.com?q1=foo%20bar&q2=biz%20baz", builder.uri().string());
+}