docs: protected static Map<String, HttpString> httpStrings() {
          final Map<String, HttpString> results = new HashMap<>();
          final Class[] classs = {Headers.class, Methods.class, Protocols.class};
  
          for (Class<?> c : classs) {
              for (Field field : c.getDeclaredFields()) {
                  if (field.getType().equals(HttpString.class)) {
                      field.setAccessible(true);
                      HttpString result = null;
                      try {
                          result = (HttpString) field.get(null);
                          results.put(result.toString(), result);
                      } catch (IllegalAccessException e) {
                          throw new RuntimeException(e);
                      }
                  }
              }
          }
          return results;
  
      }