code: static Map<String, String> resolveParamHeaders(Method method, Object[] args) {
      if (args == null) {
        return Collections.emptyMap();
      }
      Parameter[] parameters = method.getParameters();
      Map<String, String> headerMap = new HashMap<>(args.length);
      for (int i = 0; i < parameters.length; i++) {
        Parameter parameter = parameters[i];
        if (!parameter.isAnnotationPresent(ParamHeader.class)) {
          continue;
        }
        ParamHeader header = parameter.getAnnotation(ParamHeader.class);
        headerMap.put(header.name(), String.valueOf(args[i]));
      }
      return headerMap;
    }
docs: 解析参数中的请求头