使用 JSON 的 POST 在 Postman 中有效，但在 Python 中无效

Question

使用 Json 数据发布失败，python（2.7 或 3.6）抛出错误“500 内部服务器错误”，但在 Postman 中有效。从 Windows 7 命令提示符运行 python 脚本。

#!/usr/bin/env python
import urllib
import urllib2

url = 'http://<server>:<port>/web/services/notes2'
cont_type = 'application/json; charset=utf-8'
user_agent = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36'
values = {
    "LK_IN_BRANCH": "00123",
    "LK_IN_ACCOUNT": "12345678",
    "LK_IN_ENTRY_DATE": "20190315",
    "LK_IN_ENTRY_TIME": "12300111",
    "LK_IN_HOLD_DATE": "20190331",
    "LK_IN_EMP_INITS": "QTC",
    "LK_IN_COMMENT": "Comment from py script-notes2",
    "LK_IN_USER_ID": "Hxxxxxxx",
    "LK_IN_NOTE_GROUP": " "}
headers = {
    "User-Agent": user_agent,
    "Content-Type": cont_type,
    "Accept": user_agent,
    "Accept-Encoding": "gzip, deflate"}

try:
    data = urllib.urlencode(values)
    req = urllib2.Request(url, data, headers)
    response = urllib2.urlopen(req)
    json = response.read()
    print json
except urllib2.URLError as e:
    if hasattr(e, 'reason'):
        print 'We failed to reach a server.'
        print 'Reason: ', e.reason
    if hasattr(e, 'code'):
        print 'The server couldn\'t fulfill the request.'
        print 'Error code: ', e.code

如果我添加“内容长度”与邮递员相同，则会收到“400 错误请求”错误。 POST request/response in Postman Console

POST 请求使用我机器上的“Requests”第 3 方包工作，但不幸的是实际环境无法安装“Requests”，因此需要它与标准的内置 python 模块一起使用。带有用于 GET 的内置模块的 python 脚本也可以正常工作。如有任何问题，我将不胜感激。

Answer 1

您将Content-Type 标头设置为application/json，但将数据发送为application/x-www-form-urlencoded。这可能是 HTTP 400 响应的原因。

尝试将您的数据作为 JSON 字符串发送：

#!/usr/bin/env python
import json
import urllib2

url = 'http://httpbin.org/post'
cont_type = 'application/json; charset=utf-8'
user_agent = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36'
values = {
    "LK_IN_BRANCH": "00123",
    "LK_IN_ACCOUNT": "12345678",
    "LK_IN_ENTRY_DATE": "20190315",
    "LK_IN_ENTRY_TIME": "12300111",
    "LK_IN_HOLD_DATE": "20190331",
    "LK_IN_EMP_INITS": "QTC",
    "LK_IN_COMMENT": "Comment from py script-notes2",
    "LK_IN_USER_ID": "Hxxxxxxx",
    "LK_IN_NOTE_GROUP": " ",
}
headers = {
    "User-Agent": user_agent,
    "Content-Type": cont_type,
    "Accept": user_agent,
}

try:
    data = json.dumps(values)
    req = urllib2.Request(url, data, headers)
    response = urllib2.urlopen(req)
    json = response.read()
    print json
except urllib2.URLError as e:
    if hasattr(e, 'reason'):
        print 'We failed to reach a server.'
        print 'Reason: ', e.reason
    if hasattr(e, 'code'):
        print 'The server couldn\'t fulfill the request.'
        print 'Error code: ', e.code