我使用scrapy-splash来构建我的蜘蛛。现在我需要的是维护会话,所以我使用scrapy.downloadermiddlewares.cookies.CookiesMiddleware并处理set-cookie标头。我知道它处理set-cookie标头,因为我设置了COOKIES_DEBUG = True,这导致CookeMiddleware关于set-cookie标头的打印输出。
问题:当我还在图片中添加Splash时,set-cookie打印输出消失了,实际上我得到的响应头是 {'日期':[' Sun,2016年9月25日12:09:55 GMT'],'内容类型':[' text / html ; charset = utf-8'],' Server':[' TwistedWeb / 16.1.1']} 这与使用TwistedWeb的splash渲染引擎有关。
是否有任何指示告诉启动也给我原始的响应标题?
答案 0 :(得分:5)
要获得原始回复标题,您可以撰写Splash Lua script;请参阅scrapy-splash自述文件中的examples:
使用Lua脚本获取HTML响应,并将Cookie,标题,正文和方法设置为正确的值; lua_source参数值缓存在Splash服务器上,不会随每个请求一起发送(它需要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用于cookie处理;如自述文件中所述,只要scrapy-splash为configured,就会在此示例中启用它们。