python 爬虫 post请求返回的数据不全，和postman模拟的不一样，关键内容是个空列表

本人小白用爬虫爬取辽宁省政府招标信息的代码如下：

import requests
import datetime
agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36"
head={
    "User-Agent":agent,
    }
url = "http://www.ccgp-liaoning.gov.cn/portalindex.do"
params = {
    "method": "getPubInfoList",
    "t_k": None,
    }
data = {  
    "current": 1,
    "rowCount": 10,
    "searchPhrase": None,
    "district": None,
    "releaseDateStart": (datetime.datetime.now() + datetime.timedelta(days=-60)).strftime('%Y-%m-%d'),
    "releaseDateEnd": datetime.datetime.now().strftime('%Y-%m-%d'),
    "infoTypeCode": 1001,
    "year": None,
    "title": "柴油",
    "privateOrCity": 1,
        }
try:
    response = requests.post(url, params=params, data=data, headers=head, timeout=10)
    print(response.text)

返回结果为，rows中没有数据

{"current":1,"rowCount":10,"rows":[],"total":0}

用postman模拟相同参数请返回有数据

尝试过headers中加入Cookie，然而并没有用

经过实际测试，该站对 refer和 origin 没有验证，却验证了 content-type，你在header里加上content-type就可以了

import requests
import datetime
agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36"
head={
    "User-Agent":agent,
    "content-type":'application/x-www-form-urlencoded; charset=UTF-8'
    }
url = "http://www.ccgp-liaoning.gov.cn/portalindex.do?method=getPubInfoList&t_k=null"
params = {
    "method": "getPubInfoList",
    "t_k": None,
    }
data = {  
    "current": 1,
    "rowCount": 10,
    "searchPhrase": '',
    "district": '',
    "releaseDateStart": '',
    "releaseDateEnd":'',
    "infoTypeCode": 1001,
    "year": '',
    "title": "柴油",
    "privateOrCity": 1,
    }
try:
    response = requests.post(url, params=params, data=data, headers=head, timeout=10)
    print(response.text)
except:
    print('err')

你看看你的链接是否经过处理，有些网站会需要refer来验证是不是机器在访问