diff --git a/Readme.md b/Readme.md
index fcbb97f..ec43763 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,21 +1,28 @@
 
 ### TODO
+- construct list for parse-csv in csvparse.cpp instead of ml.cpp
 - support for strings with " included
-- update openssl libs
 - documentation
 - add url of source/inspiration to clib/*.cpp
+- load std lib when starting
+- add more command line args
+- split into more files
+- prejmenovat ivaluize
+- add some debug support??
+- add instrumentation (time, nr of evals, debug info, debug environment etc)
 
 #### Functionality
 - readline
-- cvs read
-- url read
-- json
+- execute system command
 - printf
 - env
 - support for including lib
 - date support
 - file functions
+  - name it here
 - string funtions
+    - name it here
+- add hash datatype
 
 
 #### Performance
@@ -28,3 +35,20 @@
 time ./build/ml -c '(include "../example.lisp") (print (fact 1000))'
 ./build/ml -f debug.lisp
 ```
+
+### Links
+https://www.tutorialspoint.com/lisp/index.htm
+https://github.com/adam-mcdaniel/wisp
+
+https://github.com/dropbox/json11
+
+#### std::vector
+https://stackoverflow.com/questions/12271017/initial-capacity-of-vector-in-c
+https://baptiste-wicht.com/posts/2012/12/cpp-benchmark-vector-list-deque.html
+
+#### parse http headers in c++
+```
+^(?:((?:https?|s?ftp):)\/\/)([^:\/\s]+)(?::(\d*))?(?:\/([^\s?#]+)?([?][^?#]*)?(#.*)?)?
+```
+
+https://stackoverflow.com/questions/25896916/parse-http-headers-in-c
diff --git a/ml.cpp b/ml.cpp
index 1db1db1..626f444 100644
--- a/ml.cpp
+++ b/ml.cpp
@@ -117,20 +117,6 @@ bool is_symbol(char ch) {
     return (isalpha(ch) || ispunct(ch)) && ch != '(' && ch != ')' && ch != '"' && ch != '\'';
 }
 
-// std::regex int_underscored_regex("[0-9][0-9_]+[0-9]");
-std::regex int_regex("[0-9]+");
-std::regex double_regex("[0-9]+\\.[0-9]+");
-
-// Is string representing int value
-bool is_string_int(const std::string &str) {
-    return std::regex_match(str, int_regex);
-}
-
-// Is string representing float value
-bool is_string_float(const std::string &str) {
-    return std::regex_match(str, double_regex);
-}
-
 
 ////////////////////////////////////////////////////////////////////////////////
 /// LISP CONSTRUCTS ////////////////////////////////////////////////////////////
@@ -1148,30 +1134,7 @@ namespace builtin {
         std::vector<std::vector<std::string> > parsed_data; // TODO some default size here
         csv.parseCSV(args[0].as_string(), parsed_data);
 
-        int rows = parsed_data.size();
-        int cols = rows > 0 ? parsed_data[0].size() : 0;
-
-        std::vector<MlValue> result;
-
-        if (rows > 0 && cols > 0) {
-            for (int r = 0; r < rows; r++) {
-                std::vector<MlValue> row;
-                for (int c = 0; c < cols; c++) {
-                    std::string value = parsed_data[r][c];
-                    if (is_string_int(value)) {
-                        row.push_back(MlValue(stoi(value)));
-                    }
-                    if (is_string_float(value)) {
-                        row.push_back(MlValue(std::stod(value)));
-                    } else {
-                        row.push_back(MlValue::string(value));
-                    }
-                }
-                result.push_back(row);
-            }
-        }
-
-        return MlValue(result);
+        return csv.ivalualize(parsed_data);
     }
 
     // Get the contents of a file
@@ -1208,21 +1171,22 @@ namespace builtin {
         eval_args(args, env);
 
         // PERF optimize it for memory usage and performance
-        // TODO handle second parameter (headers)
-        if (args.size() != 1)
-            throw MlError(MlValue("read_url", read_url), env, args.size() > 1 ? TOO_MANY_ARGS : TOO_FEW_ARGS);
+        if (args.size() < 1 || args.size() > 2)
+            throw MlError(MlValue("read_url", read_url), env, args.size() < 1 ? TOO_FEW_ARGS : TOO_MANY_ARGS);
 
         std::unordered_map<std::string, std::string> headers = {};
         HttpClient client;
 
         if (args.size() == 2) {
-            // do magick here
-            // for (auto i = map.begin(); i != map.end(); ++i) {
-            //     headers[i->first] = i->second.getString();
-            // }
+            for(const auto& pair_list: args[1].as_list()[0].as_list()) {
+                // TODO check its 2 string elements list
+                const auto& pair = pair_list.as_list();
+                headers[pair[0].as_string()] = pair[1].as_string();
+            }
         }
 
         std::pair<int, std::string> result = client.doGetRequest(args[0].as_string(), headers);
+        // TODO add helper function for this
         std::vector<MlValue> lst;
         lst.push_back(MlValue(result.first));
         lst.push_back(MlValue::string(result.second));