handling duplicate keys in HTTP post in order to specify multiple values

问题

Background

python 2.7
requests module
http post with duplicate keys to specify multiple values

Problem

Trevor is using python requests with a website that takes duplicate keys to specify multiple values. The problem is, JSON and Python dictionaries do not allow duplicate keys, so only one of the keys makes it through.

Goal

The goal is to use python requests to create an HTTP post with duplicate keys for duplicate names in the POST name-value pairs.

Failed attempts

## sample code
payload = {'fname': 'homer', 'lname': 'simpson'
         , 'favefood': 'raw donuts'
         , 'favefood': 'free donuts'
         , 'favefood': 'cold donuts'
         , 'favefood': 'hot donuts'
         }
rtt = requests.post("http://httpbin.org/post", data=payload)

Question

How can Trevor accomplish this task using python requests?

回答1:

You can composite payload in this way:

payload = [
    ('fname', 'homer'), ('lname', 'simpson'),
    ('favefood', 'raw donuts'), ('favefood', 'free donuts'),
]
rtt = requests.post("http://httpbin.org/post", data=payload)

But if your case allows, I prefer POST a JSON with all 'favefoood' in a list:

payload = {'fname': 'homer', 'lname': 'simpson', 
    'favefood': ['raw donuts', 'free donuts']
}
# 'json' param is supported from requests v2.4.2
rtt = requests.post("http://httpbin.org/post", json=payload)

Or if JSON is not preferred, combine all 'favefood' into a string (choose separator carefully):

payload = {'fname': 'homer', 'lname': 'simpson',
    'favefood': '|'.join(['raw donuts', 'free donuts']
}
rtt = requests.post("http://httpbin.org/post", data=payload)

来源：https://stackoverflow.com/questions/27116424/handling-duplicate-keys-in-http-post-in-order-to-specify-multiple-values

标签

python

http-post

python-requests