[ie/generic] Impersonate browser by default (#11206)

Also adds `impersonate` extractor arg

Authored by: Grub4K

README.md

@@ -1795,6 +1795,7 @@ #### generic
 * `key_query`: Passthrough the master m3u8 URL query to its HLS AES-128 decryption key URI if no value is provided, or else apply the query string given as `key_query=VALUE`. Note that this will have no effect if the key URI is provided via the `hls_key` extractor-arg. Does not apply to ffmpeg
 * `hls_key`: An HLS AES-128 key URI *or* key (as hex), and optionally the IV (as hex), in the form of `(URI|KEY)[,IV]`; e.g. `generic:hls_key=ABCDEF1234567980,0xFEDCBA0987654321`. Passing any of these values will force usage of the native HLS downloader and override the corresponding values found in the m3u8 playlist
 * `is_live`: Bypass live HLS detection and manually set `live_status` - a value of `false` will set `not_live`, any other value (or no value) will set `is_live`
+* `impersonate`: Target(s) to try and impersonate with the initial webpage request; e.g. `safari,chrome-110`. By default any available target will be used. Use `false` to disable impersonation
 
 #### funimation
 * `language`: Audio languages to extract, e.g. `funimation:language=english,japanese`

yt_dlp/extractor/generic.py

@@ -8,6 +8,7 @@
 from .commonprotocols import RtmpIE
 from .youtube import YoutubeIE
 from ..compat import compat_etree_fromstring
+from ..networking.impersonate import ImpersonateTarget
 from ..utils import (
     KNOWN_EXTENSIONS,
     MEDIA_EXTENSIONS,
@@ -2373,6 +2374,12 @@ def _real_extract(self, url):
         else:
             video_id = self._generic_id(url)
 
+        # Try to impersonate a web-browser by default if possible
+        # Skip impersonation if not available to omit the warning
+        impersonate = self._configuration_arg('impersonate', [''])
+        if 'false' in impersonate or not self._downloader._impersonate_target_available(ImpersonateTarget()):
+            impersonate = None
+
         # Some webservers may serve compressed content of rather big size (e.g. gzipped flac)
         # making it impossible to download only chunk of the file (yet we need only 512kB to
         # test whether it's HTML or not). According to yt-dlp default Accept-Encoding
@@ -2384,7 +2391,7 @@ def _real_extract(self, url):
         full_response = self._request_webpage(url, video_id, headers=filter_dict({
             'Accept-Encoding': 'identity',
             'Referer': smuggled_data.get('referer'),
-        }))
+        }), impersonate=impersonate)
         new_url = full_response.url
         if new_url != extract_basic_auth(url)[0]:
             self.report_following_redirect(new_url)