使用Python requests获取CBP清算通知表单结果时持续返回500状态码的问题求助

阿华AIGC实验室

2026-4-14

看起来你第一次用requests调用CBP的清算通知搜索接口就碰到了服务器内部错误，我帮你梳理几个大概率的问题点和解决方案：

1. 请求体序列化方式错误

你现在直接把Python字典传给data参数，requests会默认把它编码成表单格式（application/x-www-form-urlencoded），但接口要求的是JSON格式的请求体。你应该把data=payload改成json=payload，这样requests会自动帮你把字典序列化为JSON字符串，也能保证Content-Type头的匹配（虽然你手动设置了，但用json参数更稳妥）。

2. 缺失会话Cookie或关键请求头

政府类接口通常会校验会话状态，你可能需要先访问主页面获取会话Cookie，再带着Cookie发起POST请求。另外，浏览器请求时会自动携带Referer头，部分接口会校验这个字段，建议也加上。可以用requests.Session()来自动管理Cookie：

# 用会话保持Cookie
session = requests.Session()
# 先访问主页面获取会话标识
session.get(url)
# 再发起POST请求
response = session.post(searchUrl, headers=headers, json=payload)

3. Payload中的布尔值类型错误

看你payload里的"searchable": "true"是字符串类型的布尔值，但很多JSON接口期望的是原生布尔值（true/false，不是字符串）。你需要把这些字符串改成Python的布尔值True/False，让requests序列化成正确的JSON格式。比如把"searchable": "true"改成"searchable": True，"regex": "false"改成"regex": False。

4. 对比浏览器请求，补全缺失参数

你可以打开浏览器开发者工具的Network面板，抓一次手动提交的请求，对比你的请求头和payload是否和浏览器完全一致：

检查是否有X-CSRF-Token这类的校验头需要携带
确认draw参数是否需要和页面会话匹配
查看是否有其他隐藏的请求参数你没包含

修改后的示例代码

import requests

headers = {
    'Accept': 'application/json, text/javascript, */*; q=0.01',
    'Content-Type': 'application/json; charset=UTF-8',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36',
    'X-Requested-With': 'XMLHttpRequest',
    'Referer': 'https://trade.cbp.dhs.gov/ace/liquidation/LBNotice/'
}

payload = {
    "dtPageVars": {
        "draw": 1,
        "columns": [
            {"data": "postedDate", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "eventDate", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "voidedDate", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "event", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "basis", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "action", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "entryNumber", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "portOfEntry", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "entryDate", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "entryType", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}},
            {"data": "teamNumber", "name": "", "searchable": True, "orderable": False, "search": {"value": "", "regex": False}}
        ],
        "order": [],
        "start": 0,
        "length": 100,
        "search": {
            "value": "",
            "regex": False
        }
    },
    "searchFields": {
        "portOfEntry": "0101",
        "entryType": "01"
    }
}

url = 'https://trade.cbp.dhs.gov/ace/liquidation/LBNotice/'
searchUrl = 'https://trade.cbp.dhs.gov/ace/liquidation/LBNotice/search'

session = requests.Session()
session.get(url)
response = session.post(searchUrl, headers=headers, json=payload)

print(response.status_code)
# 打印响应内容，服务器可能会返回错误详情
print(response.text)