我正在尝试刮擦网站ASP.NET WebForm。查看源页面显示，该表单每当页面加载时从服务器接收 varssessessionId 。当单击继续按钮时，表单将AJAX请求发送给ASMX Weberivce。Web服务将重定向返回到显示搜索结果的新URL。
我已经将我的零工蜘蛛实施到提交Ajax Post请求的点，如下所示：
import scrapy
from scrapy.http import *
from scrapy.selector import Selector
import json
from scrapy.utils.response import open_in_browser
class TestSpider(scrapy.Spider):
name = "test"
allowed_domains = ['customer2.videcom.com']
start_urls = ['http://customer2.videcom.com/med-
view/VARS/Public/CustomerPanels/requirements.aspx?country=ng&lang=en']
def parse(self, response):
form_data = {
'VarsSessionID': '',
'__VIEWSTATE': '/wEPDwULLTE4MTk4NDM5NjEPZBYCAgMPZBYCAgMPFgIeB1Zpc2libGVoZGSNuC4VK36MoPTmce49gcH1j2nxAPDYsLXii0G/syddwQ=='}
yield FormRequest.from_response(response,
formid='frmChangePage',
formdata=form_data,
method='POST',
callback=self.after_parse,
url='http://customer2.videcom.com/med-view/VARS/Public/CustomerPanels/requirements.aspx?country=ng&lang=en',
)
def after_parse(self, response):
print "====RESPONSE==="
print response.headers
print "=========="
print response.request.headers
print "=========="
VarsSessionID = Selector(response=response).xpath("//*[@id='VarsSessionID']/@value").extract()[0]
viewstate = Selector(response=response).xpath("//*[@id='__VIEWSTATE']/@value").extract()[0]
print "VarsSessionID: " + VarsSessionID
print "__VIEWSTATE: " + viewstate
url = "http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?VarsSessionID="+VarsSessionID
payload = {
"FormData":
{
'Origin': ['LOS'],
'VarsSessionID': VarsSessionID,
'Destination': ['ABV'],
'DepartureDate': ['05-May-2017'],
'ReturnDate': '',
'Adults': '1',
'Children': '0',
'SmallChildren': '0',
"Seniors": '0',
"Students": '0',
"Infants": '0',
"Youths": '0',
"Teachers": '0',
"SeatedInfants": '0',
"EVoucher": '',
"recaptcha": 'SHOW',
"SearchUser": 'PUBLIC',
"SearchSource": "requirements"
}, "IsMMBChangeFlightMode": 'false'
}
headers = {
'Accept': 'application/json, text/javascript, */*',
'Accept-Encoding': 'gzip, deflate, br',
'accept-language': 'en_US',
'Connection': 'keep-alive',
'content-type': 'application/json',
'Cookie': {'VarsSessionID':''},
'User-Agent': "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36"
}
yield Request(url,
callback=self.after_search,
method='POST',
body=json.dumps(payload),
headers=headers)
def after_search(self, response):
print "========SEARCH HEADERS========"
print response.headers
print response.request.headers
open_in_browser(response)
我使用Chrome开发人员工具检查了标题(请求和响应(，以确保Cookie和其他标头详细信息。
在运行上面的代码时，我一直在获得Internal Server Error 500，如下所示：
2017-05-02 11:52:47 [scrapy.downloadermiddlewares.cookies] DEBUG:
Sending cookies to: <POST http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b>
Cookie: ASP.NET_SessionId=v2kipt3kr2elvkat5buyajhs
2017-05-02 11:52:49 [scrapy.downloadermiddlewares.retry] DEBUG:
Retrying <POST http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b> (failed 1 times): 500
Internal Server Error
2017-05-02 11:52:49 [scrapy.downloadermiddlewares.cookies] DEBUG:
Sending cookies to: <POST http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?
VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b>
Cookie: ASP.NET_SessionId=v2kipt3kr2elvkat5buyajhs
2017-05-02 11:52:52 [scrapy.downloadermiddlewares.retry] DEBUG:
Retrying <POST http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?
VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b> (failed 2 times):
500 Internal Server Error
2017-05-02 11:52:52 [scrapy.downloadermiddlewares.cookies] DEBUG:
Sending cookies to: <POST http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?
VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b>
Cookie: ASP.NET_SessionId=v2kipt3kr2elvkat5buyajhs
2017-05-02 11:52:54 [scrapy.downloadermiddlewares.retry] DEBUG: Gave up retrying <POST http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?
VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b> (failed 3 times):
500 Internal Server Error
2017-05-02 11:52:54 [scrapy.core.engine] DEBUG: Crawled (500) <POST
http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?
VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b> (referer:
http://customer2.videcom.com/med-view/VARS/Public/CustomerPanels/requirements.aspx?country=ng&lang=en)
2017-05-02 11:52:54 [scrapy.spidermiddlewares.httperror] INFO:
Ignoring response <500 http://customer2.videcom.com/med-view/VARS/Public/WebServices/AvailabilityWS.asmx/GetFlightAvailability?
VarsSessionID=3d2048c4-2af5-4065-999f-8df6f162737b>: HTTP status code is not handled or not allowed
2017-05-02 11:52:54 [scrapy.core.engine] INFO: Closing spider
(finished)
我需要帮助找出如何发布数据并接收搜索结果的帮助，例如当我使用浏览器搜索时。谢谢
用'Fresh'''中替换请求中的硬编码__VIEWSTATE参数。
ViewState绑定到某个复杂的状态，一段时间后变得无效。
有时在ASP网站上FormRequest.from_response无法正确捕获此参数，因此您可能必须检查响应。Body要查看如何提取__VIEWSTATE。
一个很好的例子在此处显示：https：//blog.scrapinghub.com/2016/04/20/scrapy-tips-tips-from-theprom-the-pros-the-pros-april-2016-edition/