key fields headers in map are in lowercase

+ getters for this map are case insensitive
+ change request fiel 'path' for 'uri', 'query', and 'abs_path'

srcs/utils.hpp

@@ -6,6 +6,8 @@
 # include <string>
 # include <sstream>
 # include <cstdlib>		// atoi
+# include <cctype>		// tolower
+# include <algorithm>	// transform
 
 # define CR "\r"
 # define LF "\n"
@@ -46,5 +48,6 @@ std::string					trim(std::string str, char c);
 http_method					str_to_http_method(std::string &str);
 std::string					http_methods_to_str(unsigned int methods);
 void						replace_all_substr(std::string &str, const std::string &ori_substr, const std::string &new_substr);
+std::string					str_tolower(std::string str);
 
 #endif