diff --git a/yt_dlp/extractor/dropout.py b/yt_dlp/extractor/dropout.py
index 475825eb8..096216418 100644
--- a/yt_dlp/extractor/dropout.py
+++ b/yt_dlp/extractor/dropout.py
@@ -137,7 +137,7 @@ class DropoutIE(InfoExtractor):
         return {
             '_type': 'url_transparent',
             'ie_key': VHXEmbedIE.ie_key(),
-            'url': embed_url,
+            'url': VHXEmbedIE._smuggle_referrer(embed_url, 'https://www.dropout.tv'),
             'id': self._search_regex(r'embed\.vhx\.tv/videos/(.+?)\?', embed_url, 'id'),
             'display_id': display_id,
             'title': title,
diff --git a/yt_dlp/extractor/generic.py b/yt_dlp/extractor/generic.py
index 54d9f61c9..dda2b1eef 100644
--- a/yt_dlp/extractor/generic.py
+++ b/yt_dlp/extractor/generic.py
@@ -2954,7 +2954,7 @@ class GenericIE(InfoExtractor):
         if vimeo_urls:
             return self.playlist_from_matches(vimeo_urls, video_id, video_title, ie=VimeoIE.ie_key())
 
-        vhx_url = VHXEmbedIE._extract_url(webpage)
+        vhx_url = VHXEmbedIE._extract_url(url, webpage)
         if vhx_url:
             return self.url_result(vhx_url, VHXEmbedIE.ie_key())
 
diff --git a/yt_dlp/extractor/vimeo.py b/yt_dlp/extractor/vimeo.py
index 59c5353ab..961734345 100644
--- a/yt_dlp/extractor/vimeo.py
+++ b/yt_dlp/extractor/vimeo.py
@@ -40,6 +40,18 @@ class VimeoBaseInfoExtractor(InfoExtractor):
     _LOGIN_REQUIRED = False
     _LOGIN_URL = 'https://vimeo.com/log_in'
 
+    @staticmethod
+    def _smuggle_referrer(url, referrer_url):
+        return smuggle_url(url, {'http_headers': {'Referer': referrer_url}})
+
+    def _unsmuggle_headers(self, url):
+        """@returns (url, smuggled_data, headers)"""
+        url, data = unsmuggle_url(url, {})
+        headers = self.get_param('http_headers').copy()
+        if 'http_headers' in data:
+            headers.update(data['http_headers'])
+        return url, data, headers
+
     def _perform_login(self, username, password):
         webpage = self._download_webpage(
             self._LOGIN_URL, None, 'Downloading login page')
@@ -717,10 +729,6 @@ class VimeoIE(VimeoBaseInfoExtractor):
         # vimeo embed with check-password page protected by Referer header
     ]
 
-    @staticmethod
-    def _smuggle_referrer(url, referrer_url):
-        return smuggle_url(url, {'http_headers': {'Referer': referrer_url}})
-
     @staticmethod
     def _extract_urls(url, webpage):
         urls = []
@@ -754,8 +762,8 @@ class VimeoIE(VimeoBaseInfoExtractor):
             'Content-Type': 'application/x-www-form-urlencoded',
         })
         checked = self._download_json(
-            url + '/check-password', video_id,
-            'Verifying the password', data=data, headers=headers)
+            f'{compat_urlparse.urlsplit(url)._replace(query=None).geturl()}/check-password',
+            video_id, 'Verifying the password', data=data, headers=headers)
         if checked is False:
             raise ExtractorError('Wrong video password', expected=True)
         return checked
@@ -830,10 +838,7 @@ class VimeoIE(VimeoBaseInfoExtractor):
                 raise
 
     def _real_extract(self, url):
-        url, data = unsmuggle_url(url, {})
-        headers = self.get_param('http_headers').copy()
-        if 'http_headers' in data:
-            headers.update(data['http_headers'])
+        url, data, headers = self._unsmuggle_headers(url)
         if 'Referer' not in headers:
             headers['Referer'] = url
 
@@ -1383,14 +1388,15 @@ class VHXEmbedIE(VimeoBaseInfoExtractor):
     _VALID_URL = r'https?://embed\.vhx\.tv/videos/(?P<id>\d+)'
 
     @staticmethod
-    def _extract_url(webpage):
+    def _extract_url(url, webpage):
         mobj = re.search(
             r'<iframe[^>]+src="(https?://embed\.vhx\.tv/videos/\d+[^"]*)"', webpage)
-        return unescapeHTML(mobj.group(1)) if mobj else None
+        return VimeoIE._smuggle_referrer(unescapeHTML(mobj.group(1)), url) if mobj else None
 
     def _real_extract(self, url):
         video_id = self._match_id(url)
-        webpage = self._download_webpage(url, video_id)
+        url, _, headers = self._unsmuggle_headers(url)
+        webpage = self._download_webpage(url, video_id, headers=headers)
         config_url = self._parse_json(self._search_regex(
             r'window\.OTTData\s*=\s*({.+})', webpage,
             'ott data'), video_id, js_to_json)['config_url']