Custom Headers

If you’d like to add HTTP headers to a request, simply pass in a dict to the headers parameter.

For example, we didn’t specify our user-agent in the previous example:

>>> url = 'https://api.github.com/some/endpoint'
>>> headers = {'user-agent': 'my-app/0.0.1'}
>>> r = requests.get(url, headers=headers)

Note: Custom headers are given less precedence than more specific sources of information. For instance:

• 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.