scrapy-splash returns 它自己的 headers 而不是来自网站的原始 headers

Question

我使用 scrapy-splash 构建我的蜘蛛。现在我需要的是维护 session，所以我使用 scrapy.downloadermiddlewares.cookies.CookiesMiddleware 并且它处理 set-cookie header。我知道它处理 set-cookie header 因为我设置了 COOKIES_DEBUG=True 并且这导致 CookeMiddleware 打印输出关于 set-cookie header。

问题：当我也将 Splash 添加到图片时，set-cookie 打印输出消失了，实际上我得到的响应是 headers {'Date': ['Sun, 25 Sep 2016 12:09:55 GMT'], 'Content-Type': ['text/html; charset=utf-8'], 'Server': ['TwistedWeb/16.1.1']} 这与使用 TwistedWeb 的启动渲染引擎有关。

有没有指令让splash也给我原回复headers？

Answer 1

要获得原始响应 headers，您可以在 scrapy-splash 自述文件中写入 Splash Lua script; see examples：

Use a Lua script to get an HTML response with cookies, headers, body and method set to correct values; lua_source argument value is cached on Splash server and is not sent with each request (it requires Splash 2.1+):

import scrapy
from scrapy_splash import SplashRequest

script = """
function main(splash)
  splash:init_cookies(splash.args.cookies)
  assert(splash:go{
    splash.args.url,
    headers=splash.args.headers,
    http_method=splash.args.http_method,
    body=splash.args.body,
    })
  assert(splash:wait(0.5))

  local entries = splash:history()
  local last_response = entries[#entries].response
  return {
    url = splash:url(),
    headers = last_response.headers,
    http_status = last_response.status,
    cookies = splash:get_cookies(),
    html = splash:html(),
  }
end
"""

class MySpider(scrapy.Spider):


    # ...
        yield SplashRequest(url, self.parse_result,
            endpoint='execute',
            cache_args=['lua_source'],
            args={'lua_source': script},
            headers={'X-My-Header': 'value'},
        )

    def parse_result(self, response):
        # here response.body contains result HTML;
        # response.headers are filled with headers from last
        # web page loaded to Splash;
        # cookies from all responses and from JavaScript are collected
        # and put into Set-Cookie response header, so that Scrapy
        # can remember them.

scrapy-splash 还提供 built-in helpers for cookie handling; they are enabled in this example as soon as scrapy-splash is configured，如自述文件中所述。

scrapy-splash returns 它自己的 headers 而不是来自网站的原始 headers

scrapy-splash returns its own headers and not the original headers from the site

python

scrapy

scrapy-splash

splash-js-render