diff --git a/backend/main.py b/backend/main.py
index e9f4174..88c5749 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -33,10 +33,19 @@ def get_impersonate_session():
     return sess
 
 # Stream params that have dedicated meaning and must never be treated as headers.
-STREAM_RESERVED_PARAMS = {'url'}
+# `referer` is mapped to a real Referer header by collect_passthrough_headers, but
+# `live` is purely a playback hint and must not leak upstream as a header.
+STREAM_RESERVED_PARAMS = {'url', 'live'}
 # Headers that affect the transport layer rather than the resource itself; allowing
 # these to be forwarded could enable request smuggling or vhost-routing abuse.
 STREAM_DISALLOWED_HEADER_NAMES = {'host', 'content-length', 'transfer-encoding', 'connection', 'expect'}
+# Headers curl_cffi sets coherently for the impersonated browser. Forwarding the
+# client's (or extractor's) own values for these would contradict the spoofed TLS
+# fingerprint and defeat impersonation, so they are never relayed upstream.
+STREAM_IMPERSONATION_MANAGED_HEADERS = {
+    'user-agent', 'accept', 'accept-encoding', 'accept-language',
+    'sec-ch-ua', 'sec-ch-ua-mobile', 'sec-ch-ua-platform',
+}
 # RFC 7230 token charset for header field-names.
 HEADER_NAME_RE = re.compile(r"^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$")
 # Reject control characters (CR/LF/NUL etc.) that could be used for header injection.
@@ -430,6 +439,17 @@ def stream_video():
             headers['Cookie'] = request.headers['Cookie']
             dbg("forwarding cookies")
 
+        # Relay the per-format headers (e.g. Cookie) the frontend forwarded as
+        # query params so cookie/token-authorized origins serve the media.
+        # Referer is already set above, and impersonation-managed headers are left
+        # to curl_cffi to keep the request coherent with the spoofed fingerprint.
+        for key, value in collect_passthrough_headers(request.args).items():
+            lower = key.lower()
+            if lower == 'referer' or lower in STREAM_IMPERSONATION_MANAGED_HEADERS:
+                continue
+            if value:
+                headers[key] = value
+
         # Remove keys with None values
         return {k: v for k, v in headers.items() if v}
 
@@ -556,10 +576,27 @@ def stream_video():
         except LookupError:
             return body_bytes.decode("utf-8", errors="replace")
 
+    def passthrough_param_suffix():
+        # The relayed headers (e.g. Cookie) the upstream needs for authorization,
+        # encoded as &Name=value so they ride along on every proxied child URL
+        # (variant playlists, segments). Referer is appended separately by each
+        # rewriter; impersonation-managed headers stay with curl_cffi.
+        parts = []
+        for key, value in collect_passthrough_headers(request.args).items():
+            lower = key.lower()
+            if lower == 'referer' or lower in STREAM_IMPERSONATION_MANAGED_HEADERS:
+                continue
+            if not value:
+                continue
+            parts.append(f"&{urllib.parse.quote(key)}={urllib.parse.quote(str(value))}")
+        return ''.join(parts)
+
     def rewrite_hls_playlist(body_text, base_url, referer):
+        extra = passthrough_param_suffix()
+
         def proxied_url(target):
             absolute = urljoin(base_url, target)
-            return f"/api/stream?url={urllib.parse.quote(absolute, safe='')}&referer={urllib.parse.quote(referer, safe='')}"
+            return f"/api/stream?url={urllib.parse.quote(absolute, safe='')}&referer={urllib.parse.quote(referer, safe='')}{extra}"
 
         lines = body_text.splitlines()
         rewritten = []
@@ -720,9 +757,11 @@ def stream_video():
         if not video_fmts:
             return None
 
+        extra = passthrough_param_suffix()
+
         def proxied(url):
             return (f"/api/stream?url={urllib.parse.quote(url, safe='')}"
-                    f"&referer={urllib.parse.quote(referer, safe='')}")
+                    f"&referer={urllib.parse.quote(referer, safe='')}{extra}")
 
         lines = ['#EXTM3U', '#EXT-X-VERSION:3']
 
diff --git a/frontend/js/feed.js b/frontend/js/feed.js
index a3bd5c6..638ce7c 100644
--- a/frontend/js/feed.js
+++ b/frontend/js/feed.js
@@ -229,10 +229,7 @@ App.feed = App.feed || {};
 
         const resolved = App.videos.resolveStreamSource(videoData);
         if (!resolved.url) return;
-        const refererParam = resolved.referer ? `&referer=${encodeURIComponent(resolved.referer)}` : '';
-        const userAgentParam = resolved.userAgent ? `&User-Agent=${encodeURIComponent(resolved.userAgent)}` : '';
-        const liveParam = resolved.isLive ? '&live=1' : '';
-        const streamUrl = `/api/stream?url=${encodeURIComponent(resolved.url)}${refererParam}${userAgentParam}${liveParam}`;
+        const streamUrl = App.videos.buildStreamUrlFromSource(resolved);
         const isHls = resolved.isLive ? true : /\.m3u8($|\?)/i.test(resolved.url);
 
         video.muted = state.feedMuted;
diff --git a/frontend/js/player.js b/frontend/js/player.js
index 3e5d359..4f03dc0 100644
--- a/frontend/js/player.js
+++ b/frontend/js/player.js
@@ -157,10 +157,7 @@ App.player = App.player || {};
             if (entry.direct) {
                 streamUrl = resolved.url;
             } else {
-                const refererParam = resolved.referer ? `&referer=${encodeURIComponent(resolved.referer)}` : '';
-                const userAgentParam = resolved.userAgent ? `&User-Agent=${encodeURIComponent(resolved.userAgent)}` : '';
-                const liveParam = resolved.isLive ? '&live=1' : '';
-                streamUrl = `/api/stream?url=${encodeURIComponent(resolved.url)}${refererParam}${userAgentParam}${liveParam}`;
+                streamUrl = App.videos.buildStreamUrlFromSource(resolved);
             }
             let isHls = /\.m3u8($|\?)/i.test(resolved.url);
             let isDirectMedia = /\.(mp4|m4v|m4s|webm|ts|mov)($|\?)/i.test(resolved.url);
diff --git a/frontend/js/videos.js b/frontend/js/videos.js
index 592a480..5499723 100644
--- a/frontend/js/videos.js
+++ b/frontend/js/videos.js
@@ -860,6 +860,23 @@ App.videos = App.videos || {};
         return headers[name] || headers[name.toLowerCase()] || '';
     };
 
+    // Merge the resource-level (meta) and format-level http_headers into a single
+    // map so every upstream header the extractor attached (Referer, User-Agent,
+    // Cookie, etc.) can be relayed to the stream proxy. Format-level headers win
+    // on conflict since they describe the specific media URL.
+    const mergeHeaders = function(metaHeaders, fmtHeaders) {
+        const merged = {};
+        [metaHeaders, fmtHeaders].forEach((headers) => {
+            if (!headers || typeof headers !== 'object') return;
+            Object.keys(headers).forEach((name) => {
+                const value = headers[name];
+                if (value === undefined || value === null || value === '') return;
+                merged[name] = String(value);
+            });
+        });
+        return merged;
+    };
+
     const deriveReferer = function(url) {
         if (!url) return '';
         try {
@@ -958,7 +975,8 @@ App.videos = App.videos || {};
             const explicitReferer = headerValue(fmt.http_headers, 'Referer') || metaReferer;
             const referer = explicitReferer || deriveReferer(fmt.url);
             const userAgent = headerValue(fmt.http_headers, 'User-Agent') || metaUserAgent;
-            return { url: fmt.url, referer, userAgent, isLive, refererRequired: !!explicitReferer };
+            const headers = mergeHeaders(meta.http_headers, fmt.http_headers);
+            return { url: fmt.url, referer, userAgent, headers, isLive, refererRequired: !!explicitReferer };
         });
 
         if (!sources.length) {
@@ -968,6 +986,7 @@ App.videos = App.videos || {};
                     url: fallbackUrl,
                     referer: metaReferer || deriveReferer(fallbackUrl),
                     userAgent: metaUserAgent,
+                    headers: mergeHeaders(meta.http_headers, null),
                     isLive,
                     refererRequired: !!metaReferer
                 });
@@ -1131,10 +1150,28 @@ App.videos = App.videos || {};
     // by the backend as request headers, so use real header names here.
     App.videos.buildStreamUrlFromSource = function(resolved) {
         if (!resolved || !resolved.url) return '';
-        const refererParam = resolved.referer ? `&referer=${encodeURIComponent(resolved.referer)}` : '';
-        const userAgentParam = resolved.userAgent ? `&User-Agent=${encodeURIComponent(resolved.userAgent)}` : '';
-        const liveParam = resolved.isLive ? '&live=1' : '';
-        return `/api/stream?url=${encodeURIComponent(resolved.url)}${refererParam}${userAgentParam}${liveParam}`;
+        const params = [];
+        // Referer keeps its dedicated lowercase param (the backend maps it back to
+        // `Referer`) so the derived-referer fallback in resolveStreamSources is
+        // honoured even when no explicit Referer header was present.
+        if (resolved.referer) params.push(`referer=${encodeURIComponent(resolved.referer)}`);
+        if (resolved.userAgent) params.push(`User-Agent=${encodeURIComponent(resolved.userAgent)}`);
+        // Relay every other upstream header the extractor attached (e.g. Cookie).
+        // Referer/User-Agent are already emitted above, so skip them here to avoid
+        // duplicating the same header under two query keys.
+        const headers = resolved.headers;
+        if (headers && typeof headers === 'object') {
+            Object.keys(headers).forEach((name) => {
+                const lower = name.toLowerCase();
+                if (lower === 'referer' || lower === 'user-agent') return;
+                const value = headers[name];
+                if (value === undefined || value === null || value === '') return;
+                params.push(`${encodeURIComponent(name)}=${encodeURIComponent(value)}`);
+            });
+        }
+        if (resolved.isLive) params.push('live=1');
+        const query = params.length ? `&${params.join('&')}` : '';
+        return `/api/stream?url=${encodeURIComponent(resolved.url)}${query}`;
     };
 
     App.videos.buildStreamUrl = function(videoOrUrl, options) {