TEMPORARY: fix at the sync HTTP client to reduce the memory pressure

src/http/Client.cc

@@ -97,15 +97,17 @@ void Client::read(CallbackType const& onDataRead) {
     assert(onDataRead != nullptr);  // no callback function provided
     string const context = "Client::" + string(__func__) + " ";
     _onDataRead = onDataRead;
+#if 0
     _errorChecked("curl_easy_setopt(CURLOPT_HTTP_VERSION)",
                   curl_easy_setopt(_hcurl, CURLOPT_HTTP_VERSION, (long)CURL_HTTP_VERSION_1_1));
-#if 0
-    _errorChecked("curl_easy_setopt(CURLOPT_FORBID_REUSE)",
-                  curl_easy_setopt(_hcurl, CURLOPT_FORBID_REUSE, 1L));
 #endif
     _errorChecked("curl_easy_setopt(CURLOPT_SOCKOPTFUNCTION)",
                   curl_easy_setopt(_hcurl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback));
-
+#if 1
+    // NOTE: This option invalidates the alternative.
+    _errorChecked("curl_easy_setopt(CURLOPT_FORBID_REUSE)",
+                  curl_easy_setopt(_hcurl, CURLOPT_FORBID_REUSE, 1L));
+#else
     long const maxCachedConnections = 512;
     _errorChecked("curl_easy_setopt(CURLOPT_MAXCONNECTS)",
                   curl_easy_setopt(_hcurl, CURLOPT_MAXCONNECTS, maxCachedConnections));
@@ -115,6 +117,7 @@ void Client::read(CallbackType const& onDataRead) {
                   curl_easy_setopt(_hcurl, CURLOPT_TCP_KEEPIDLE, 3L));
     _errorChecked("curl_easy_setopt(CURLOPT_TCP_KEEPINTVL)",
                   curl_easy_setopt(_hcurl, CURLOPT_TCP_KEEPINTVL, 3L));
+#endif
 #if 0
     // DISABLED: the large buffer size may consume too much kernel memory(?)
     // CURL_MAX_READ_SIZE is 10 MB since version 7.88.0.