diff --git a/include/ircd/resource/response.h b/include/ircd/resource/response.h
index 60736b918..42114f807 100644
--- a/include/ircd/resource/response.h
+++ b/include/ircd/resource/response.h
@@ -72,7 +72,7 @@ struct ircd::resource::response
 /// something like json::stack, which streams chunks of JSON. To facilitate
 /// this type of pairing and real world use, instances of this object contain
 /// a simple buffered flush-callback system.
-//
+///
 /// By default this object allocates a buffer to facilitate the chunked
 /// response and to satisfy the majority pattern of allocating this same
 /// buffer immediately preceding construction. A function pointer can also
@@ -102,8 +102,9 @@ struct ircd::resource::response::chunked
 
 	std::function<const_buffer (const const_buffer &)> flusher();
 
-	chunked(client &, const http::code &, const string_view &content_type, const string_view &headers = {}, const size_t &buffer_size = default_buffer_size, const mutable_buffer & = {});
+	chunked(client &, const http::code &, const string_view &content_type, const string_view &headers, const size_t &buffer_size = default_buffer_size, const mutable_buffer & = {});
 	chunked(client &, const http::code &, const string_view &content_type, const vector_view<const http::header> &, const size_t &buffer_size = default_buffer_size, const mutable_buffer & = {});
+	chunked(client &, const http::code &, const string_view &content_type, const size_t &buffer_size = default_buffer_size, const mutable_buffer & = {});
 	chunked(client &, const http::code &, const vector_view<const http::header> &, const size_t &buffer_size = default_buffer_size, const mutable_buffer & = {});
 	chunked(client &, const http::code &, const size_t &buffer_size = default_buffer_size, const mutable_buffer & = {});
 	chunked() = default;
diff --git a/ircd/resource.cc b/ircd/resource.cc
index 9e46e1bff..a680a9707 100644
--- a/ircd/resource.cc
+++ b/ircd/resource.cc
@@ -852,6 +852,23 @@ ircd::resource::response::chunked::chunked(client &client,
 {
 }
 
+ircd::resource::response::chunked::chunked(client &client,
+                                           const http::code &code,
+                                           const string_view &content_type,
+                                           const size_t &buffer_size,
+                                           const mutable_buffer &buf)
+:chunked
+{
+	client,
+	code,
+	content_type,
+	string_view{}, // headers
+	buffer_size,
+	buf,
+}
+{
+}
+
 ircd::resource::response::chunked::chunked(client &client,
                                            const http::code &code,
                                            const string_view &content_type,