Stop using cv2pdb and improve HTTP handling a little

luprex/cpp/core/http.cpp

@@ -1143,6 +1143,24 @@ eng::string HttpParser::first_path_component(std::string_view defval) const {
     }
 }
 
+eng::string HttpParser::to_lua_identifier(std::string_view pathcomp) {
+    eng::ostringstream oss;
+    for (char c : pathcomp) {
+        if (sv::ascii_islower(c)) {
+            oss << c;
+        } else if (sv::ascii_isupper(c)) {
+            oss << char(c + 'a' - 'A');
+        } else if (sv::ascii_isdigit(c)) {
+            oss << c;
+        } else if ((c == '.') || (c == '_')) {
+            oss << '_';
+        } else {
+            return "";
+        }
+    }
+    return oss.str();
+}
+
 void HttpParser::fail(int code, std::string_view message) {
     status_ = code;
     error_ = message;