scrapy采集时伪装成 HTTP/1.1的方法

 DOWNLOADER_HTTPCLIENTFACTORY = 'myproject.downloader.HTTPClientFactory'
 ```
保存以下代码到单独的.py文件
```python
from scrapy.core.downloader.webclient import ScrapyHTTPClientFactory, ScrapyHTTPPageGetter
class PageGetter(ScrapyHTTPPageGetter):
    def sendCommand(self, command, path):
        self.transport.write('%s %s HTTP/1.1\r\n' % (command, path))
class HTTPClientFactory(ScrapyHTTPClientFactory):
     protocol = PageGetter