esp8266在OTA的时候，连接http服务器如何打印返回的响应头

esp8266在HTTP——ota的时候，想要打印接收头，但是http_parser_execute（）这个函数处理完了，不知道如何打印出响应头

用代码块功能插入代码，请勿粘贴截图

bool bParsed = false;
int parsed=0;

http_parser httpParser;
   http_parser_settings httpSettings;

   // 初使化解析器及回调函数
   http_parser_init(&httpParser, HTTP_REQUEST);
  http_parser_settings_init(&httpSettings);




if (client->state < HTTP_STATE_REQ_COMPLETE_HEADER) {
    return ESP_FAIL;
}

client->state = HTTP_STATE_REQ_COMPLETE_DATA;
esp_http_buffer_t *buffer = client->response->buffer;
client->response->status_code = -1;
//char *p;
//p=(char *)(&(client->response->headers));
//ESP_LOGI(TAG, "client_response_headers_sizeof = %d",sizeof(client->response->headers));
//for(int i=0;i<400;i++)
//{
//    ESP_LOGI("", "%02x",*p++);
    //putchar(*p++);
//}

while (client->state < HTTP_STATE_RES_COMPLETE_HEADER) {
    buffer->len = esp_transport_read(client->transport, buffer->data, client->buffer_size, client->timeout_ms);
    if (buffer->len < 0) {
        return ESP_FAIL;
    }
  parsed=  http_parser_execute(client->parser, client->parser_settings, buffer->data, buffer->len);
}
 printf("http_parser_execute => parsebytes:[%d] parseok:[%d] \n", parsed, bParsed);

// if(bParsed)
// {
// printf("url: [%s] \n", client.connection_info.url);
//printf("status: [%s] \n", client->);
// printf("heads: \n");
/* for (std::map::iterator iter = mapHeadField.begin(); iter != mapHeadField.end(); ++iter)
{
printf("\t %s : %s \n", iter->first.c_str(), iter->second.c_str());
}
printf("body: [%s] \n", strBody.c_str());*/
// }
ESP_LOGD(TAG, "content_length = %d", client->response->content_length);
ESP_LOGI(TAG, "content_length = %d", client->response->content_length);
if (client->response->content_length <= 0) {
client->response->is_chunked = true;
return 0;
}
return client->response->content_length;