我还没明白原理不过这代码可以实现 可以用 有时间再看原理
import requests
def get_content_length(data):
length = len(data.keys()) * 2 - 1
total = ''.join(list(data.keys()) + list(data.values()))
length += len(total)
return length
data ={}
data['search[city1]'] = '19'
data['search[city2]'] = '291'
data['search[city3]'] = '0'
data['b1']='查询'
req = requests.post('http://httpbin/post', data)
print('实际的Content-Length为', req.json()['headers']['Content-Length'])
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