Reorder complete_headers call to avoid race condition

Author: HerbSears-OANDA

Release/src/http/client/http_client_asio.cpp

@@ -1207,11 +1207,11 @@ class asio_context : public request_context, public std::enable_shared_from_this
                 m_response.headers().add(std::move(name), std::move(value));
             }
         }
-        complete_headers();
-
         m_content_length = std::numeric_limits<size_t>::max(); // Without Content-Length header, size should be same as TCP stream - set it size_t max.
         m_response.headers().match(header_names::content_length, m_content_length);
 
+        complete_headers();
+
         // note: need to check for 'chunked' here as well, azure storage sends both
         // transfer-encoding:chunked and content-length:0 (although HTTP says not to)
         if (m_request.method() == U("HEAD") || (!needChunked && m_content_length == 0))