前言

requests 响应头部在转json时，想格式化输出，结果报错TypeError: Object of type CaseInsensitiveDict is not JSON serializable

报错详情

示例代码

import requests
import json
# 上海悠悠 wx:283340479
# blog:https://www.cnblogs.com/yoyoketang/


r = requests.get('http://httpbin.org/get')
print(r.headers)
print(json.dumps(r.headers, indent=4))

运行后报错

{'Date': 'Mon, 25 Sep 2023 11:32:31 GMT', 'Content-Type': 'application/json', 'Content-Length': '307', 'Connection': 'keep-alive', 'Server': 'gunicorn/19.9.0', 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Credentials': 'true'}
Traceback (most recent call last):
  File "D:/demo/untitled1/a0_xue/__init__.py", line 7, in <module>
    print(json.dumps(r.headers, indent=4))
  File "D:\python3.8\lib\json\__init__.py", line 234, in dumps
    return cls(
  File "D:\python3.8\lib\json\encoder.py", line 201, in encode
    chunks = list(chunks)
  File "D:\python3.8\lib\json\encoder.py", line 438, in _iterencode
    o = _default(o)
  File "D:\python3.8\lib\json\encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type CaseInsensitiveDict is not JSON serializable

虽然r.headers 打印出来看到的是字典类型，其实并不是真正的字典，它是CaseInsensitiveDict 类型

import requests
# 上海悠悠 wx:283340479
# blog:https://www.cnblogs.com/yoyoketang/

r = requests.get('http://httpbin.org/get')
print(type(r.headers))  # <class 'requests.structures.CaseInsensitiveDict'>

所以是没法通过json.dupms() 转成json数据。

解决方法

知道报错原因解决就很简单了，只需转成 dict 类型即可

import requests
import json
# 上海悠悠 wx:283340479
# blog:https://www.cnblogs.com/yoyoketang/

r = requests.get('http://httpbin.org/get')

# 响应头部
response_header = json.dumps(dict(r.headers), indent=4)
print(f'响应头部: {response_header}')

# 请求头部
request_header = json.dumps(dict(r.request.headers), indent=4)
print(f'请求头部: {request_header}')

运行结果

响应头部: {
    "Date": "Mon, 25 Sep 2023 11:38:01 GMT",
    "Content-Type": "application/json",
    "Content-Length": "307",
    "Connection": "keep-alive",
    "Server": "gunicorn/19.9.0",
    "Access-Control-Allow-Origin": "*",
    "Access-Control-Allow-Credentials": "true"
}
请求头部: {
    "User-Agent": "python-requests/2.28.2",
    "Accept-Encoding": "gzip, deflate",
    "Accept": "*/*",
    "Connection": "keep-alive"
}