[core] Process header cookies on loading

4 files changed, 357 insertions, 33 deletions

diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index 60780b8a7..6cf555827 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -10,14 +10,30 @@ import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 import copy
+import json
 
-from test.helper import FakeYDL, assertRegexpMatches
+from test.helper import (
+    FakeYDL,
+    assertRegexpMatches,
+    try_rm,
+)
 from youtube_dl import YoutubeDL
-from youtube_dl.compat import compat_str, compat_urllib_error
+from youtube_dl.compat import (
+    compat_http_cookiejar_Cookie,
+    compat_http_cookies_SimpleCookie,
+    compat_kwargs,
+    compat_str,
+    compat_urllib_error,
+)
+
 from youtube_dl.extractor import YoutubeIE
 from youtube_dl.extractor.common import InfoExtractor
 from youtube_dl.postprocessor.common import PostProcessor
-from youtube_dl.utils import ExtractorError, match_filter_func
+from youtube_dl.utils import (
+    ExtractorError,
+    match_filter_func,
+    traverse_obj,
+)
 
 TEST_URL = 'http://localhost/sample.mp4'
 
@@ -29,11 +45,14 @@ class YDL(FakeYDL):
         self.msgs = []
 
     def process_info(self, info_dict):
-        self.downloaded_info_dicts.append(info_dict)
+        self.downloaded_info_dicts.append(info_dict.copy())
 
     def to_screen(self, msg):
         self.msgs.append(msg)
 
+    def dl(self, *args, **kwargs):
+        assert False, 'Downloader must not be invoked for test_YoutubeDL'
+
 
 def _make_result(formats, **kwargs):
     res = {
@@ -42,8 +61,9 @@ def _make_result(formats, **kwargs):
         'title': 'testttitle',
         'extractor': 'testex',
         'extractor_key': 'TestEx',
+        'webpage_url': 'http://example.com/watch?v=shenanigans',
     }
-    res.update(**kwargs)
+    res.update(**compat_kwargs(kwargs))
     return res
 
 
@@ -1011,5 +1031,160 @@ class TestYoutubeDL(unittest.TestCase):
         self.assertEqual(out_info['release_date'], '20210930')
 
 
+class TestYoutubeDLCookies(unittest.TestCase):
+
+    @staticmethod
+    def encode_cookie(cookie):
+        if not isinstance(cookie, dict):
+            cookie = vars(cookie)
+        for name, value in cookie.items():
+            yield name, compat_str(value)
+
+    @classmethod
+    def comparable_cookies(cls, cookies):
+        # Work around cookiejar cookies not being unicode strings
+        return sorted(map(tuple, map(sorted, map(cls.encode_cookie, cookies))))
+
+    def assertSameCookies(self, c1, c2, msg=None):
+        return self.assertEqual(
+            *map(self.comparable_cookies, (c1, c2)),
+            msg=msg)
+
+    def assertSameCookieStrings(self, c1, c2, msg=None):
+        return self.assertSameCookies(
+            *map(lambda c: compat_http_cookies_SimpleCookie(c).values(), (c1, c2)),
+            msg=msg)
+
+    def test_header_cookies(self):
+
+        ydl = FakeYDL()
+        ydl.report_warning = lambda *_, **__: None
+
+        def cookie(name, value, version=None, domain='', path='', secure=False, expires=None):
+            return compat_http_cookiejar_Cookie(
+                version or 0, name, value, None, False,
+                domain, bool(domain), bool(domain), path, bool(path),
+                secure, expires, False, None, None, rest={})
+
+        test_url, test_domain = (t % ('yt.dl',) for t in ('https://%s/test', '.%s'))
+
+        def test(encoded_cookies, cookies, headers=False, round_trip=None, error_re=None):
+            def _test():
+                ydl.cookiejar.clear()
+                ydl._load_cookies(encoded_cookies, autoscope=headers)
+                if headers:
+                    ydl._apply_header_cookies(test_url)
+                data = {'url': test_url}
+                ydl._calc_headers(data)
+                self.assertSameCookies(
+                    cookies, ydl.cookiejar,
+                    'Extracted cookiejar.Cookie is not the same')
+                if not headers:
+                    self.assertSameCookieStrings(
+                        data.get('cookies'), round_trip or encoded_cookies,
+                        msg='Cookie is not the same as round trip')
+                ydl.__dict__['_YoutubeDL__header_cookies'] = []
+
+            try:
+                _test()
+            except AssertionError:
+                raise
+            except Exception as e:
+                if not error_re:
+                    raise
+                assertRegexpMatches(self, e.args[0], error_re.join(('.*',) * 2))
+
+        test('test=value; Domain=' + test_domain, [cookie('test', 'value', domain=test_domain)])
+        test('test=value', [cookie('test', 'value')], error_re='Unscoped cookies are not allowed')
+        test('cookie1=value1; Domain={0}; Path=/test; cookie2=value2; Domain={0}; Path=/'.format(test_domain), [
+            cookie('cookie1', 'value1', domain=test_domain, path='/test'),
+            cookie('cookie2', 'value2', domain=test_domain, path='/')])
+        cookie_kw = compat_kwargs(
+            {'domain': test_domain, 'path': '/test', 'secure': True, 'expires': '9999999999', })
+        test('test=value; Domain={domain}; Path={path}; Secure; Expires={expires}'.format(**cookie_kw), [
+            cookie('test', 'value', **cookie_kw)])
+        test('test="value; "; path=/test; domain=' + test_domain, [
+            cookie('test', 'value; ', domain=test_domain, path='/test')],
+            round_trip='test="value\\073 "; Domain={0}; Path=/test'.format(test_domain))
+        test('name=; Domain=' + test_domain, [cookie('name', '', domain=test_domain)],
+             round_trip='name=""; Domain=' + test_domain)
+        test('test=value', [cookie('test', 'value', domain=test_domain)], headers=True)
+        test('cookie1=value; Domain={0}; cookie2=value'.format(test_domain), [],
+             headers=True, error_re='Invalid syntax')
+        ydl.report_warning = ydl.report_error
+        test('test=value', [], headers=True, error_re='Passing cookies as a header is a potential security risk')
+
+    def test_infojson_cookies(self):
+        TEST_FILE = 'test_infojson_cookies.info.json'
+        TEST_URL = 'https://example.com/example.mp4'
+        COOKIES = 'a=b; Domain=.example.com; c=d; Domain=.example.com'
+        COOKIE_HEADER = {'Cookie': 'a=b; c=d'}
+
+        ydl = FakeYDL()
+        ydl.process_info = lambda x: ydl._write_info_json('test', x, TEST_FILE)
+
+        def make_info(info_header_cookies=False, fmts_header_cookies=False, cookies_field=False):
+            fmt = {'url': TEST_URL}
+            if fmts_header_cookies:
+                fmt['http_headers'] = COOKIE_HEADER
+            if cookies_field:
+                fmt['cookies'] = COOKIES
+            return _make_result([fmt], http_headers=COOKIE_HEADER if info_header_cookies else None)
+
+        def test(initial_info, note):
+
+            def failure_msg(why):
+                return ' when '.join((why, note))
+
+            result = {}
+            result['processed'] = ydl.process_ie_result(initial_info)
+            self.assertTrue(ydl.cookiejar.get_cookies_for_url(TEST_URL),
+                            msg=failure_msg('No cookies set in cookiejar after initial process'))
+            ydl.cookiejar.clear()
+            with open(TEST_FILE) as infojson:
+                result['loaded'] = ydl.sanitize_info(json.load(infojson), True)
+            result['final'] = ydl.process_ie_result(result['loaded'].copy(), download=False)
+            self.assertTrue(ydl.cookiejar.get_cookies_for_url(TEST_URL),
+                            msg=failure_msg('No cookies set in cookiejar after final process'))
+            ydl.cookiejar.clear()
+            for key in ('processed', 'loaded', 'final'):
+                info = result[key]
+                self.assertIsNone(
+                    traverse_obj(info, ((None, ('formats', 0)), 'http_headers', 'Cookie'), casesense=False, get_all=False),
+                    msg=failure_msg('Cookie header not removed in {0} result'.format(key)))
+                self.assertSameCookieStrings(
+                    traverse_obj(info, ((None, ('formats', 0)), 'cookies'), get_all=False), COOKIES,
+                    msg=failure_msg('No cookies field found in {0} result'.format(key)))
+
+        test({'url': TEST_URL, 'http_headers': COOKIE_HEADER, 'id': '1', 'title': 'x'}, 'no formats field')
+        test(make_info(info_header_cookies=True), 'info_dict header cokies')
+        test(make_info(fmts_header_cookies=True), 'format header cookies')
+        test(make_info(info_header_cookies=True, fmts_header_cookies=True), 'info_dict and format header cookies')
+        test(make_info(info_header_cookies=True, fmts_header_cookies=True, cookies_field=True), 'all cookies fields')
+        test(make_info(cookies_field=True), 'cookies format field')
+        test({'url': TEST_URL, 'cookies': COOKIES, 'id': '1', 'title': 'x'}, 'info_dict cookies field only')
+
+        try_rm(TEST_FILE)
+
+    def test_add_headers_cookie(self):
+        def check_for_cookie_header(result):
+            return traverse_obj(result, ((None, ('formats', 0)), 'http_headers', 'Cookie'), casesense=False, get_all=False)
+
+        ydl = FakeYDL({'http_headers': {'Cookie': 'a=b'}})
+        ydl._apply_header_cookies(_make_result([])['webpage_url'])  # Scope to input webpage URL: .example.com
+
+        fmt = {'url': 'https://example.com/video.mp4'}
+        result = ydl.process_ie_result(_make_result([fmt]), download=False)
+        self.assertIsNone(check_for_cookie_header(result), msg='http_headers cookies in result info_dict')
+        self.assertEqual(result.get('cookies'), 'a=b; Domain=.example.com', msg='No cookies were set in cookies field')
+        self.assertIn('a=b', ydl.cookiejar.get_cookie_header(fmt['url']), msg='No cookies were set in cookiejar')
+
+        fmt = {'url': 'https://wrong.com/video.mp4'}
+        result = ydl.process_ie_result(_make_result([fmt]), download=False)
+        self.assertIsNone(check_for_cookie_header(result), msg='http_headers cookies for wrong domain')
+        self.assertFalse(result.get('cookies'), msg='Cookies set in cookies field for wrong domain')
+        self.assertFalse(ydl.cookiejar.get_cookie_header(fmt['url']), msg='Cookies set in cookiejar for wrong domain')
+
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/test/test_YoutubeDLCookieJar.py b/test/test_YoutubeDLCookieJar.py
index 05f48bd74..4f9dd71ae 100644
--- a/test/test_YoutubeDLCookieJar.py
+++ b/test/test_YoutubeDLCookieJar.py
@@ -46,6 +46,20 @@ class TestYoutubeDLCookieJar(unittest.TestCase):
         # will be ignored
         self.assertFalse(cookiejar._cookies)
 
+    def test_get_cookie_header(self):
+        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/httponly_cookies.txt')
+        cookiejar.load(ignore_discard=True, ignore_expires=True)
+        header = cookiejar.get_cookie_header('https://www.foobar.foobar')
+        self.assertIn('HTTPONLY_COOKIE', header)
+
+    def test_get_cookies_for_url(self):
+        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/session_cookies.txt')
+        cookiejar.load(ignore_discard=True, ignore_expires=True)
+        cookies = cookiejar.get_cookies_for_url('https://www.foobar.foobar/')
+        self.assertEqual(len(cookies), 2)
+        cookies = cookiejar.get_cookies_for_url('https://foobar.foobar/')
+        self.assertFalse(cookies)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 1435754c2..98d080f43 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -5,6 +5,7 @@ from __future__ import absolute_import, unicode_literals
 
 import collections
 import contextlib
+import copy
 import datetime
 import errno
 import fileinput
@@ -34,10 +35,12 @@ from string import ascii_letters
 
 from .compat import (
     compat_basestring,
-    compat_cookiejar,
+    compat_collections_chain_map as ChainMap,
     compat_filter as filter,
     compat_get_terminal_size,
     compat_http_client,
+    compat_http_cookiejar_Cookie,
+    compat_http_cookies_SimpleCookie,
     compat_integer_types,
     compat_kwargs,
     compat_map as map,
@@ -53,6 +56,7 @@ from .compat import (
 from .utils import (
     age_restricted,
     args_to_str,
+    bug_reports_message,
     ContentTooShortError,
     date_from_str,
     DateRange,
@@ -97,6 +101,7 @@ from .utils import (
     std_headers,
     str_or_none,
     subtitles_filename,
+    traverse_obj,
     UnavailableVideoError,
     url_basename,
     version_tuple,
@@ -376,6 +381,9 @@ class YoutubeDL(object):
         self.params.update(params)
         self.cache = Cache(self)
 
+        self._header_cookies = []
+        self._load_cookies_from_headers(self.params.get('http_headers'))
+
         def check_deprecated(param, option, suggestion):
             if self.params.get(param) is not None:
                 self.report_warning(
@@ -870,8 +878,83 @@ class YoutubeDL(object):
                     raise
         return wrapper
 
+    def _remove_cookie_header(self, http_headers):
+        """Filters out `Cookie` header from an `http_headers` dict
+        The `Cookie` header is removed to prevent leaks as a result of unscoped cookies.
+        See: https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-v8mc-9377-rwjj
+
+        @param http_headers     An `http_headers` dict from which any `Cookie` header
+                                should be removed, or None
+        """
+        return dict(filter(lambda pair: pair[0].lower() != 'cookie', (http_headers or {}).items()))
+
+    def _load_cookies(self, data, **kwargs):
+        """Loads cookies from a `Cookie` header
+
+        This tries to work around the security vulnerability of passing cookies to every domain.
+
+        @param data         The Cookie header as a string to load the cookies from
+        @param autoscope    If `False`, scope cookies using Set-Cookie syntax and error for cookie without domains
+                            If `True`, save cookies for later to be stored in the jar with a limited scope
+                            If a URL, save cookies in the jar with the domain of the URL
+        """
+        # autoscope=True (kw-only)
+        autoscope = kwargs.get('autoscope', True)
+
+        for cookie in compat_http_cookies_SimpleCookie(data).values() if data else []:
+            if autoscope and any(cookie.values()):
+                raise ValueError('Invalid syntax in Cookie Header')
+
+            domain = cookie.get('domain') or ''
+            expiry = cookie.get('expires')
+            if expiry == '':  # 0 is valid so we check for `''` explicitly
+                expiry = None
+            prepared_cookie = compat_http_cookiejar_Cookie(
+                cookie.get('version') or 0, cookie.key, cookie.value, None, False,
+                domain, True, True, cookie.get('path') or '', bool(cookie.get('path')),
+                bool(cookie.get('secure')), expiry, False, None, None, {})
+
+            if domain:
+                self.cookiejar.set_cookie(prepared_cookie)
+            elif autoscope is True:
+                self.report_warning(
+                    'Passing cookies as a header is a potential security risk; '
+                    'they will be scoped to the domain of the downloaded urls. '
+                    'Please consider loading cookies from a file or browser instead.',
+                    only_once=True)
+                self._header_cookies.append(prepared_cookie)
+            elif autoscope:
+                self.report_warning(
+                    'The extractor result contains an unscoped cookie as an HTTP header. '
+                    'If you are specifying an input URL, ' + bug_reports_message(),
+                    only_once=True)
+                self._apply_header_cookies(autoscope, [prepared_cookie])
+            else:
+                self.report_unscoped_cookies()
+
+    def _load_cookies_from_headers(self, headers):
+        self._load_cookies(traverse_obj(headers, 'cookie', casesense=False))
+
+    def _apply_header_cookies(self, url, cookies=None):
+        """This method applies stray header cookies to the provided url
+
+        This loads header cookies and scopes them to the domain provided in `url`.
+        While this is not ideal, it helps reduce the risk of them being sent to
+        an unintended destination.
+        """
+        parsed = compat_urllib_parse.urlparse(url)
+        if not parsed.hostname:
+            return
+
+        for cookie in map(copy.copy, cookies or self._header_cookies):
+            cookie.domain = '.' + parsed.hostname
+            self.cookiejar.set_cookie(cookie)
+
     @__handle_extraction_exceptions
     def __extract_info(self, url, ie, download, extra_info, process):
+        # Compat with passing cookies in http headers
+        self._apply_header_cookies(url)
+
         ie_result = ie.extract(url)
         if ie_result is None:  # Finished already (backwards compatibility; listformats and friends should be moved here)
             return
@@ -897,7 +980,7 @@ class YoutubeDL(object):
 
     def process_ie_result(self, ie_result, download=True, extra_info={}):
         """
-        Take the result of the ie(may be modified) and resolve all unresolved
+        Take the result of the ie (may be modified) and resolve all unresolved
         references (URLs, playlist items).
 
         It will also download the videos if 'download'.
@@ -1468,23 +1551,45 @@ class YoutubeDL(object):
         parsed_selector = _parse_format_selection(iter(TokenIterator(tokens)))
         return _build_selector_function(parsed_selector)
 
-    def _calc_headers(self, info_dict):
-        res = std_headers.copy()
-
-        add_headers = info_dict.get('http_headers')
-        if add_headers:
-            res.update(add_headers)
+    def _calc_headers(self, info_dict, load_cookies=False):
+        if load_cookies:  # For --load-info-json
+            # load cookies from http_headers in legacy info.json
+            self._load_cookies(traverse_obj(info_dict, ('http_headers', 'Cookie'), casesense=False),
+                               autoscope=info_dict['url'])
+            # load scoped cookies from info.json
+            self._load_cookies(info_dict.get('cookies'), autoscope=False)
 
-        cookies = self._calc_cookies(info_dict)
+        cookies = self.cookiejar.get_cookies_for_url(info_dict['url'])
         if cookies:
-            res['Cookie'] = cookies
+            # Make a string like name1=val1; attr1=a_val1; ...name2=val2; ...
+            # By convention a cookie name can't be a well-known attribute name
+            # so this syntax is unambiguous and can be parsed by (eg) SimpleCookie
+            encoder = compat_http_cookies_SimpleCookie()
+            values = []
+            attributes = (('Domain', '='), ('Path', '='), ('Secure',), ('Expires', '='), ('Version', '='))
+            attributes = tuple([x[0].lower()] + list(x) for x in attributes)
+            for cookie in cookies:
+                _, value = encoder.value_encode(cookie.value)
+                # Py 2 '' --> '', Py 3 '' --> '""'
+                if value == '':
+                    value = '""'
+                values.append('='.join((cookie.name, value)))
+                for attr in attributes:
+                    value = getattr(cookie, attr[0], None)
+                    if value:
+                        values.append('%s%s' % (''.join(attr[1:]), value if len(attr) == 3 else ''))
+            info_dict['cookies'] = '; '.join(values)
+
+        res = std_headers.copy()
+        res.update(info_dict.get('http_headers') or {})
+        res = self._remove_cookie_header(res)
 
         if 'X-Forwarded-For' not in res:
             x_forwarded_for_ip = info_dict.get('__x_forwarded_for_ip')
             if x_forwarded_for_ip:
                 res['X-Forwarded-For'] = x_forwarded_for_ip
 
-        return res
+        return res or None
 
     def _calc_cookies(self, info_dict):
         pr = sanitized_Request(info_dict['url'])
@@ -1663,10 +1768,13 @@ class YoutubeDL(object):
                 format['protocol'] = determine_protocol(format)
             # Add HTTP headers, so that external programs can use them from the
             # json output
-            full_format_info = info_dict.copy()
-            full_format_info.update(format)
-            format['http_headers'] = self._calc_headers(full_format_info)
-        # Remove private housekeeping stuff
+            format['http_headers'] = self._calc_headers(ChainMap(format, info_dict), load_cookies=True)
+
+        # Safeguard against old/insecure infojson when using --load-info-json
+        info_dict['http_headers'] = self._remove_cookie_header(
+            info_dict.get('http_headers') or {}) or None
+
+        # Remove private housekeeping stuff (copied to http_headers in _calc_headers())
         if '__x_forwarded_for_ip' in info_dict:
             del info_dict['__x_forwarded_for_ip']
 
@@ -1927,17 +2035,9 @@ class YoutubeDL(object):
                                                 (sub_lang, error_to_compat_str(err)))
                             continue
 
-        if self.params.get('writeinfojson', False):
-            infofn = replace_extension(filename, 'info.json', info_dict.get('ext'))
-            if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(infofn)):
-                self.to_screen('[info] Video description metadata is already present')
-            else:
-                self.to_screen('[info] Writing video description metadata as JSON to: ' + infofn)
-                try:
-                    write_json_file(self.filter_requested_info(info_dict), infofn)
-                except (OSError, IOError):
-                    self.report_error('Cannot write metadata to JSON file ' + infofn)
-                    return
+        self._write_info_json(
+            'video description', info_dict,
+            replace_extension(filename, 'info.json', info_dict.get('ext')))
 
         self._write_thumbnails(info_dict, filename)
 
@@ -1958,7 +2058,11 @@ class YoutubeDL(object):
                         fd.add_progress_hook(ph)
                     if self.params.get('verbose'):
                         self.to_screen('[debug] Invoking downloader on %r' % info.get('url'))
-                    return fd.download(name, info)
+
+                    new_info = dict((k, v) for k, v in info.items() if not k.startswith('__p'))
+                    new_info['http_headers'] = self._calc_headers(new_info)
+
+                    return fd.download(name, new_info)
 
                 if info_dict.get('requested_formats') is not None:
                     downloaded = []
@@ -2484,7 +2588,7 @@ class YoutubeDL(object):
         opts_proxy = self.params.get('proxy')
 
         if opts_cookiefile is None:
-            self.cookiejar = compat_cookiejar.CookieJar()
+            self.cookiejar = YoutubeDLCookieJar()
         else:
             opts_cookiefile = expand_path(opts_cookiefile)
             self.cookiejar = YoutubeDLCookieJar(opts_cookiefile)
@@ -2545,6 +2649,28 @@ class YoutubeDL(object):
             encoding = preferredencoding()
         return encoding
 
+    def _write_info_json(self, label, info_dict, infofn, overwrite=None):
+        if not self.params.get('writeinfojson', False):
+            return False
+
+        def msg(fmt, lbl):
+            return fmt % (lbl + ' metadata',)
+
+        if overwrite is None:
+            overwrite = not self.params.get('nooverwrites', False)
+
+        if not overwrite and os.path.exists(encodeFilename(infofn)):
+            self.to_screen(msg('[info] %s is already present', label.title()))
+            return 'exists'
+        else:
+            self.to_screen(msg('[info] Writing %s as JSON to: ' + infofn, label))
+            try:
+                write_json_file(self.filter_requested_info(info_dict), infofn)
+                return True
+            except (OSError, IOError):
+                self.report_error(msg('Cannot write %s to JSON file ' + infofn, label))
+                return
+
     def _write_thumbnails(self, info_dict, filename):
         if self.params.get('writethumbnail', False):
             thumbnails = info_dict.get('thumbnails')
diff --git a/youtube_dl/downloader/common.py b/youtube_dl/downloader/common.py
index c86ce2aa5..08c98b336 100644
--- a/youtube_dl/downloader/common.py
+++ b/youtube_dl/downloader/common.py
@@ -13,7 +13,9 @@ from ..utils import (
     error_to_compat_str,
     format_bytes,
     shell_quote,
+    T,
     timeconvert,
+    traverse_obj,
 )
 
 
@@ -339,6 +341,10 @@ class FileDownloader(object):
     def download(self, filename, info_dict):
         """Download to a filename using the info from info_dict
         Return True on success and False otherwise
+
+        This method filters the `Cookie` header from the info_dict to prevent leaks.
+        Downloaders have their own way of handling cookies.
+        See: https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-v8mc-9377-rwjj
         """
 
         nooverwrites_and_exists = (
@@ -373,6 +379,9 @@ class FileDownloader(object):
                     else '%.2f' % sleep_interval))
             time.sleep(sleep_interval)
 
+        info_dict['http_headers'] = dict(traverse_obj(info_dict, (
+            'http_headers', T(dict.items), lambda _, pair: pair[0].lower() != 'cookie'))) or None
+
         return self.real_download(filename, info_dict)
 
     def real_download(self, filename, info_dict):