Python请求如何正确使用发布请求的有效负载

Question

我做错了什么？我以前曾抓过网站，但这个有效载荷对我来说很难。

from requests import session
from bs4 import BeautifulSoup as bs

payload = {
    "p_flow_id" : 838 ,
    "p_flow_step_id": 4 ,
    "p_instance" :1282563643133 ,
    "p_page_submission_id" :4990502617229,
    "p_request" : ""
 }


with session() as c:
     c.post('http://nid.usace.army.mil/cm_apex/f?p=838:4:0::NO/wwv_flow.accept', data=payload)
     url = c.get('http://nid.usace.army.mil/cm_apex/f?p=838:4:0::NO/wwv_flow.accept')
     html = url.content 
     soup = bs(html)

Answer 1

您的第一个请求返回404错误：

from bs4 import BeautifulSoup as bs

payload = {
    "p_flow_id" : 838 ,
    "p_flow_step_id": 4 ,
    "p_instance" :1282563643133 ,
    "p_page_submission_id" :4990502617229,
    "p_request" : ""
    }


with session() as c:
     print 'in' 
     r1 = c.post('http://nid.usace.army.mil/cm_apex/f?p=838:4:0::NO/wwv_flow.accept', data=payload)
     print r1.status_code  # 404
     url = c.get('http://nid.usace.army.mil/cm_apex/f?p=838:4:0::NO/wwv_flow.accept')
     html = url.content 
     soup = bs(html,'lxml')
     print soup