import requests

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url = 'https://w3schools.com/python/demopage.asp'

myobj = {'somekey': 'somevalue'}

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#use the 'headers' parameter to set the HTTP headers:

x = requests.post(url, data = myobj, headers = {"HTTP_HOST": "MyVeryOwnHost"})

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print(x.text)

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#the 'demopage.asp' prints all HTTP Headers

​

​