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[3.9] gh-87497: Document that urllib.request sends headers in camel case (GH-24661) #91518

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Apr 14, 2022
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[3.9] gh-87497: Document that urllib.request sends headers in camel case (GH-24661) #91518

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1 change: 1 addition & 0 deletions Doc/library/urllib.request.rst
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Expand Up @@ -213,6 +213,7 @@ The following classes are provided:
(X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11"``, while
:mod:`urllib`'s default user agent string is
``"Python-urllib/2.6"`` (on Python 2.6).
All header keys are sent in camel case.

An appropriate ``Content-Type`` header should be included if the *data*
argument is present. If this header has not been provided and *data*
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9 changes: 9 additions & 0 deletions Lib/test/test_urllib2_localnet.py
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Expand Up @@ -613,6 +613,15 @@ def test_sending_headers(self):
pass
self.assertEqual(handler.headers_received["Range"], "bytes=20-39")

def test_sending_headers_camel(self):
handler = self.start_server()
req = urllib.request.Request("http://localhost:%s/" % handler.port,
headers={"X-SoMe-hEader": "foobar"})
with urllib.request.urlopen(req):
pass
self.assertIn("X-Some-Header", handler.headers_received.keys())
self.assertNotIn("X-SoMe-hEader", handler.headers_received.keys())

def test_basic(self):
handler = self.start_server()
with urllib.request.urlopen("http://localhost:%s" % handler.port) as open_url:
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