Requests Documentation, Release 2.18.4
• Authorization headers set with headers= will be overridden if credentials are specified in .netrc, which in
turn will be overridden by the auth= parameter.
• Authorization headers will be removed if you get redirected off-host.
• Proxy-Authorization headers will be overridden by proxy credentials provided in the URL.
• Content-Length headers will be overridden when we can determine the length of the content.
Furthermore, Requests does not change its behavior at all based on which custom headers are specified. The headers
are simply passed on into the final request.
Note: All header values must be a string, bytestring, or unicode. While permitted, it’s advised to avoid passing
unicode header values.
More complicated POST requests
Typically, you want to send some form-encoded data — much like an HTML form. To do this, simply pass a dictionary
to the data argument. Your dictionary of data will automatically be form-encoded when the request is made:
>>> payload = {'key1': 'value1', 'key2': 'value2'}
>>> r = requests.post("http://httpbin.org/post", data=payload)
>>> print(r.text)
{
...
"form": {
"key2": "value2",
"key1": "value1"
},
...
}
You can also pass a list of tuples to the data argument. This is particularly useful when the form has multiple elements
that use the same key:
>>> payload = (('key1', 'value1'), ('key1', 'value2'))
>>> r = requests.post('http://httpbin.org/post', data=payload)
>>> print(r.text)
{
...
"form": {
"key1": [
"value1",
"value2"
]
},
...
}
There are times that you may want to send data that is not form-encoded. If you pass in a string instead of a dict,
that data will be posted directly.
For example, the GitHub API v3 accepts JSON-Encoded POST/PATCH data:
>>> import json
>>> url = 'https://api.github.com/some/endpoint'
>>> payload = {'some': 'data'}
12 Chapter 3. The User Guide
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