Upload proxy_handler.py

proxy_handler.py

@@ -37,227 +37,6 @@ class ProxyHandler:
     async def __aexit__(self, exc_type, exc_val, exc_tb):
         await self.client.aclose()
 
-    def transform_content(self, content: str) -> str:
-        """Transform content by replacing HTML tags and optionally removing think tags"""
-        if not content:
-            return content
-
-        logger.debug(f"SHOW_THINK_TAGS setting: {settings.SHOW_THINK_TAGS}")
-
-        # Optionally remove thinking content based on configuration
-        if not settings.SHOW_THINK_TAGS:
-            logger.debug("Removing thinking content from response")
-            original_length = len(content)
-
-            # Remove <details> blocks (thinking content) - handle both closed and unclosed tags
-            # First try to remove complete <details>...</details> blocks
-            content = re.sub(
-                r"<details[^>]*>.*?</details>", "", content, flags=re.DOTALL
-            )
-
-            # Then remove any remaining <details> opening tags and everything after them until we hit answer content
-            # Look for pattern: <details...><summary>...</summary>...content... and remove the thinking part
-            content = re.sub(
-                r"<details[^>]*>.*?(?=\s*[A-Z]|\s*\d|\s*$)",
-                "",
-                content,
-                flags=re.DOTALL,
-            )
-
-            content = content.strip()
-
-            logger.debug(
-                f"Content length after removing thinking content: {original_length} -> {len(content)}"
-            )
-        else:
-            logger.debug("Keeping thinking content, converting to <think> tags")
-
-            # Replace <details> with <think>
-            content = re.sub(r"<details[^>]*>", "<think>", content)
-            content = content.replace("</details>", "</think>")
-
-            # Remove <summary> tags and their content
-            content = re.sub(r"<summary>.*?</summary>", "", content, flags=re.DOTALL)
-
-            # If there's no closing </think>, add it at the end of thinking content
-            if "<think>" in content and "</think>" not in content:
-                # Find where thinking ends and answer begins
-                think_start = content.find("<think>")
-                if think_start != -1:
-                    # Look for the start of the actual answer (usually starts with a capital letter or number)
-                    answer_match = re.search(r"\n\s*[A-Z0-9]", content[think_start:])
-                    if answer_match:
-                        insert_pos = think_start + answer_match.start()
-                        content = (
-                            content[:insert_pos] + "</think>\n" + content[insert_pos:]
-                        )
-                    else:
-                        content += "</think>"
-
-        return content.strip()
-
-    async def proxy_request(self, request: ChatCompletionRequest) -> Dict[str, Any]:
-        """Proxy request to Z.AI API"""
-        cookie = await cookie_manager.get_next_cookie()
-        if not cookie:
-            raise HTTPException(status_code=503, detail="No available cookies")
-
-        # Transform model name
-        target_model = (
-            settings.UPSTREAM_MODEL
-            if request.model == settings.MODEL_NAME
-            else request.model
-        )
-
-        # Determine if this should be a streaming response
-        is_streaming = (
-            request.stream if request.stream is not None else settings.DEFAULT_STREAM
-        )
-
-        # Validate parameter compatibility
-        if is_streaming and not settings.SHOW_THINK_TAGS:
-            logger.warning("SHOW_THINK_TAGS=false is ignored for streaming responses")
-
-        # Prepare request data
-        request_data = request.model_dump(exclude_none=True)
-        request_data["model"] = target_model
-
-        # Build request data based on actual Z.AI format from zai-messages.md
-        import uuid
-
-        request_data = {
-            "stream": True,  # Always request streaming from Z.AI for processing
-            "model": target_model,
-            "messages": request_data["messages"],
-            "background_tasks": {"title_generation": True, "tags_generation": True},
-            "chat_id": str(uuid.uuid4()),
-            "features": {
-                "image_generation": False,
-                "code_interpreter": False,
-                "web_search": False,
-                "auto_web_search": False,
-            },
-            "id": str(uuid.uuid4()),
-            "mcp_servers": ["deep-web-search"],
-            "model_item": {"id": target_model, "name": "GLM-4.5", "owned_by": "openai"},
-            "params": {},
-            "tool_servers": [],
-            "variables": {
-                "{{USER_NAME}}": "User",
-                "{{USER_LOCATION}}": "Unknown",
-                "{{CURRENT_DATETIME}}": "2025-08-04 16:46:56",
-            },
-        }
-
-        logger.debug(f"Sending request data: {request_data}")
-
-        headers = {
-            "Content-Type": "application/json",
-            "Authorization": f"Bearer {cookie}",
-            "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36",
-            "Accept": "application/json, text/event-stream",
-            "Accept-Language": "zh-CN",
-            "sec-ch-ua": '"Not)A;Brand";v="8", "Chromium";v="138", "Google Chrome";v="138"',
-            "sec-ch-ua-mobile": "?0",
-            "sec-ch-ua-platform": '"macOS"',
-            "x-fe-version": "prod-fe-1.0.53",
-            "Origin": "https://chat.z.ai",
-            "Referer": "https://chat.z.ai/c/069723d5-060b-404f-992c-4705f1554c4c",
-        }
-
-        try:
-            # Use client.stream() for TRUE streaming response - this is the key fix!
-            async with self.client.stream(
-                "POST",
-                settings.UPSTREAM_URL,
-                json=request_data,
-                headers=headers,
-                timeout=httpx.Timeout(60.0, read=300.0)
-            ) as response:
-
-                if response.status_code == 401:
-                    await cookie_manager.mark_cookie_failed(cookie)
-                    raise HTTPException(status_code=401, detail="Invalid authentication")
-
-                if response.status_code != 200:
-                    # For streaming, we need to read the error response properly
-                    try:
-                        error_text = await response.aread()
-                        error_detail = error_text.decode('utf-8')
-                    except:
-                        error_detail = f"HTTP {response.status_code}"
-
-                    raise HTTPException(
-                        status_code=response.status_code,
-                        detail=f"Upstream error: {error_detail}",
-                    )
-
-                await cookie_manager.mark_cookie_success(cookie)
-                return {"response": response, "cookie": cookie}
-
-        except httpx.RequestError as e:
-            logger.error(f"Request error: {e}")
-            logger.error(f"Request error type: {type(e).__name__}")
-            logger.error(f"Request URL: {settings.UPSTREAM_URL}")
-            logger.error(f"Request timeout: {self.client.timeout}")
-            await cookie_manager.mark_cookie_failed(cookie)
-            raise HTTPException(
-                status_code=503, detail=f"Upstream service unavailable: {str(e)}"
-            )
-
-    async def process_streaming_response(
-        self, response: httpx.Response
-    ) -> AsyncGenerator[Dict[str, Any], None]:
-        """Process streaming response from Z.AI - TRUE real-time processing"""
-        buffer = ""
-
-        # Use aiter_text with small chunk size for real-time processing
-        async for chunk in response.aiter_text(chunk_size=1024):  # Small chunks for responsiveness
-            if not chunk:
-                continue
-
-            buffer += chunk
-
-            # Process complete lines immediately
-            while "\n" in buffer:
-                line, buffer = buffer.split("\n", 1)
-                line = line.strip()
-
-                if not line.startswith("data: "):
-                    continue
-
-                payload = line[6:].strip()
-                if payload == "[DONE]":
-                    return
-
-                try:
-                    parsed = json.loads(payload)
-
-                    # Check for errors first
-                    if parsed.get("error") or (parsed.get("data", {}).get("error")):
-                        error_detail = (
-                            parsed.get("error", {}).get("detail")
-                            or parsed.get("data", {}).get("error", {}).get("detail")
-                            or "Unknown error from upstream"
-                        )
-                        logger.error(f"Upstream error: {error_detail}")
-                        raise HTTPException(
-                            status_code=400, detail=f"Upstream error: {error_detail}"
-                        )
-
-                    # Clean up response data
-                    if parsed.get("data"):
-                        # Remove unwanted fields for cleaner processing
-                        parsed["data"].pop("edit_index", None)
-                        parsed["data"].pop("edit_content", None)
-
-                    # Yield immediately for real-time streaming
-                    yield parsed
-
-                except json.JSONDecodeError as e:
-                    logger.debug(f"JSON decode error (skipping): {e}")
-                    continue  # Skip non-JSON lines
-
     async def handle_chat_completion(self, request: ChatCompletionRequest):
         """Handle chat completion request"""
         # Determine final streaming mode
@@ -276,202 +55,18 @@ class ProxyHandler:
                 },
             )
         else:
-            # For non-streaming responses, collect all streaming data first
-            chunks = []
-            async for chunk_data in self.stream_proxy_response(request):
-                if chunk_data.startswith("data: ") and not chunk_data.startswith("data: [DONE]"):
-                    try:
-                        chunk_json = json.loads(chunk_data[6:])
-                        if chunk_json.get("choices", [{}])[0].get("delta", {}).get("content"):
-                            chunks.append(chunk_json["choices"][0]["delta"]["content"])
-                    except:
-                        continue
-
-            # Combine all content
-            full_content = "".join(chunks)
-
-            # Apply final transformation for non-streaming response
-            transformed_content = self.transform_content(full_content)
-
-            # Return as non-streaming response
-            import time
-            import uuid
-            return ChatCompletionResponse(
-                id=f"chatcmpl-{uuid.uuid4().hex[:29]}",
-                created=int(time.time()),
-                model=request.model,
-                choices=[
-                    {
-                        "index": 0,
-                        "message": {"role": "assistant", "content": transformed_content},
-                        "finish_reason": "stop",
-                    }
-                ],
-            )
-
-    async def stream_response(self, response: httpx.Response, model: str) -> AsyncGenerator[str, None]:
-        """Generate TRUE streaming response in OpenAI format - real-time processing"""
-        import uuid
-        import time
-
-        # Generate a unique completion ID
-        completion_id = f"chatcmpl-{uuid.uuid4().hex[:29]}"
-        current_phase = None
-
-        try:
-            # Real-time streaming: process each chunk immediately as it arrives
-            async for parsed in self.process_streaming_response(response):
-                try:
-                    data = parsed.get("data", {})
-                    delta_content = data.get("delta_content", "")
-                    phase = data.get("phase", "")
-
-                    # Track phase changes
-                    if phase != current_phase:
-                        current_phase = phase
-                        logger.debug(f"Phase changed to: {phase}")
-
-                    # Apply filtering based on SHOW_THINK_TAGS and phase
-                    should_send_content = True
-
-                    if not settings.SHOW_THINK_TAGS and phase == "thinking":
-                        # Skip thinking content when SHOW_THINK_TAGS=false
-                        should_send_content = False
-                        logger.debug(f"Skipping thinking content (SHOW_THINK_TAGS=false)")
-
-                    # Process and send content immediately if we should
-                    if delta_content and should_send_content:
-                        # Minimal transformation for real-time streaming
-                        transformed_delta = delta_content
-
-                        if settings.SHOW_THINK_TAGS:
-                            # Simple tag replacement for streaming
-                            transformed_delta = re.sub(r'<details[^>]*>', '<think>', transformed_delta)
-                            transformed_delta = transformed_delta.replace('</details>', '</think>')
-                            # Note: Skip complex regex for streaming performance
-
-                        # Create and send OpenAI-compatible chunk immediately
-                        openai_chunk = {
-                            "id": completion_id,
-                            "object": "chat.completion.chunk",
-                            "created": int(time.time()),
-                            "model": model,
-                            "choices": [{
-                                "index": 0,
-                                "delta": {
-                                    "content": transformed_delta
-                                },
-                                "finish_reason": None
-                            }]
-                        }
-
-                        # Yield immediately for real-time streaming
-                        yield f"data: {json.dumps(openai_chunk)}\n\n"
-
-                except Exception as e:
-                    logger.error(f"Error processing streaming chunk: {e}")
-                    continue
-
-            # Send final completion chunk
-            final_chunk = {
-                "id": completion_id,
-                "object": "chat.completion.chunk",
-                "created": int(time.time()),
-                "model": model,
-                "choices": [{
-                    "index": 0,
-                    "delta": {},
-                    "finish_reason": "stop"
-                }]
-            }
-
-            yield f"data: {json.dumps(final_chunk)}\n\n"
-            yield "data: [DONE]\n\n"
-
-        except Exception as e:
-            logger.error(f"Streaming error: {e}")
-            # Send error in OpenAI format
-            error_chunk = {
-                "error": {
-                    "message": str(e),
-                    "type": "server_error"
-                }
-            }
-            yield f"data: {json.dumps(error_chunk)}\n\n"
-
-    async def non_stream_response(
-        self, response: httpx.Response, model: str
-    ) -> ChatCompletionResponse:
-        """Generate non-streaming response"""
-        chunks = []
-        async for parsed in self.process_streaming_response(response):
-            chunks.append(parsed)
-            logger.debug(f"Received chunk: {parsed}")  # Debug log
-
-        if not chunks:
-            raise HTTPException(status_code=500, detail="No response from upstream")
-
-        logger.info(f"Total chunks received: {len(chunks)}")
-        logger.debug(f"First chunk structure: {chunks[0] if chunks else 'None'}")
-
-        # Aggregate content based on SHOW_THINK_TAGS setting
-        if settings.SHOW_THINK_TAGS:
-            # Include all content
-            full_content = "".join(
-                chunk.get("data", {}).get("delta_content", "") for chunk in chunks
-            )
-        else:
-            # Only include answer phase content
-            full_content = "".join(
-                chunk.get("data", {}).get("delta_content", "")
-                for chunk in chunks
-                if chunk.get("data", {}).get("phase") == "answer"
-            )
-
-        logger.info(f"Aggregated content length: {len(full_content)}")
-        logger.debug(
-            f"Full aggregated content: {full_content}"
-        )  # Show full content for debugging
-
-        # Apply content transformation (including think tag filtering)
-        transformed_content = self.transform_content(full_content)
+            # For non-streaming, collect and process the full response
+            return await self.aggregate_non_stream_response(request)
 
-        logger.info(f"Transformed content length: {len(transformed_content)}")
-        logger.debug(f"Transformed content: {transformed_content[:200]}...")
-
-        # Create OpenAI-compatible response
-        return ChatCompletionResponse(
-            id=chunks[0].get("data", {}).get("id", "chatcmpl-unknown"),
-            created=int(time.time()),
-            model=model,
-            choices=[
-                {
-                    "index": 0,
-                    "message": {"role": "assistant", "content": transformed_content},
-                    "finish_reason": "stop",
-                }
-            ],
-        )
-
-    async def stream_proxy_response(self, request: ChatCompletionRequest) -> AsyncGenerator[str, None]:
-        """TRUE streaming proxy - direct pass-through with minimal processing"""
+    async def _build_request_payload(self, request: ChatCompletionRequest) -> Dict[str, Any]:
+        """Helper to build the Z.AI request payload"""
         import uuid
-        import time
-
-        # Get cookie
-        cookie = await cookie_manager.get_next_cookie()
-        if not cookie:
-            raise HTTPException(status_code=503, detail="No valid authentication available")
-
-        # Prepare request data
-        request_data = request.model_dump(exclude_none=True)
-        target_model = "0727-360B-API"  # Map GLM-4.5 to Z.AI model
-
-        # Build Z.AI request format
-        request_data = {
-            "stream": True,  # Always request streaming from Z.AI
+        target_model = "0727-360B-API"
+        
+        return {
+            "stream": True,
             "model": target_model,
-            "messages": request_data["messages"],
+            "messages": request.messages,
             "background_tasks": {
                 "title_generation": True,
                 "tags_generation": True
@@ -499,8 +94,10 @@ class ProxyHandler:
                 "{{CURRENT_DATETIME}}": "2025-08-04 16:46:56"
             }
         }
-
-        headers = {
+        
+    def _build_request_headers(self, cookie: str) -> Dict[str, str]:
+        """Helper to build request headers"""
+        return {
             "Content-Type": "application/json",
             "Authorization": f"Bearer {cookie}",
             "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36",
@@ -511,120 +108,191 @@ class ProxyHandler:
             "sec-ch-ua-platform": '"macOS"',
             "x-fe-version": "prod-fe-1.0.53",
             "Origin": "https://chat.z.ai",
-            "Referer": "https://chat.z.ai/c/069723d5-060b-404f-992c-4705f1554c4c",
+            "Referer": "https://chat.z.ai/",
         }
 
+    async def stream_proxy_response(self, request: ChatCompletionRequest) -> AsyncGenerator[str, None]:
+        """Handle true streaming response, transforming Z.AI stream to OpenAI format."""
+        import uuid
+        
+        cookie = await cookie_manager.get_next_cookie()
+        if not cookie:
+            raise HTTPException(status_code=503, detail="No valid authentication available")
+
+        request_data = await self._build_request_payload(request)
+        headers = self._build_request_headers(cookie)
         completion_id = f"chatcmpl-{uuid.uuid4().hex[:29]}"
-        current_phase = None
+        
+        is_in_think_block = False
 
         try:
-            # Create a new client for this streaming request to avoid conflicts
-            async with httpx.AsyncClient(
-                timeout=httpx.Timeout(60.0, read=300.0),
-                limits=httpx.Limits(max_connections=100, max_keepalive_connections=20),
-                http2=True
-            ) as stream_client:
-                async with stream_client.stream(
-                    "POST",
-                    settings.UPSTREAM_URL,
-                    json=request_data,
-                    headers=headers
-                ) as response:
-
-                    if response.status_code == 401:
-                        await cookie_manager.mark_cookie_failed(cookie)
-                        raise HTTPException(status_code=401, detail="Invalid authentication")
-
-                    if response.status_code != 200:
-                        await cookie_manager.mark_cookie_failed(cookie)
-                        raise HTTPException(status_code=response.status_code, detail="Upstream error")
-
-                    await cookie_manager.mark_cookie_success(cookie)
-
-                    # Process streaming response in real-time
-                    buffer = ""
-                    async for chunk in response.aiter_text(chunk_size=1024):
-                        if not chunk:
-                            continue
-
-                        buffer += chunk
+            async with self.client.stream("POST", settings.UPSTREAM_URL, json=request_data, headers=headers) as response:
+                if response.status_code == 401:
+                    await cookie_manager.mark_cookie_failed(cookie)
+                    raise HTTPException(status_code=401, detail="Invalid authentication")
+                if response.status_code != 200:
+                    await cookie_manager.mark_cookie_failed(cookie)
+                    error_text = await response.aread()
+                    raise HTTPException(status_code=response.status_code, detail=f"Upstream error: {error_text.decode()}")
 
-                        # Process complete lines immediately
-                        while "\n" in buffer:
-                            line, buffer = buffer.split("\n", 1)
-                            line = line.strip()
+                await cookie_manager.mark_cookie_success(cookie)
 
-                            if not line.startswith("data: "):
-                                continue
+                buffer = ""
+                async for chunk in response.aiter_text():
+                    buffer += chunk
+                    while "\n" in buffer:
+                        line, buffer = buffer.split("\n", 1)
+                        if not line.startswith("data:"):
+                            continue
 
-                            payload = line[6:].strip()
-                            if payload == "[DONE]":
-                                # Send final chunk and done
-                                final_chunk = {
+                        payload = line[6:].strip()
+                        if payload == "[DONE]":
+                            break
+                        
+                        try:
+                            parsed = json.loads(payload)
+                            data = parsed.get("data", {})
+                            delta_content = data.get("delta_content", "")
+                            phase = data.get("phase", "")
+
+                            content_to_send = ""
+
+                            if settings.SHOW_THINK_TAGS:
+                                # State-based think tag management
+                                if phase == "thinking" and not is_in_think_block:
+                                    content_to_send += "<think>"
+                                    is_in_think_block = True
+                                elif phase == "answer" and is_in_think_block:
+                                    content_to_send += "</think>\n"
+                                    is_in_think_block = False
+                                
+                                # Clean up original tags regardless of phase
+                                cleaned_delta = re.sub(r"<details[^>]*>.*?</details>", "", delta_content, flags=re.DOTALL)
+                                cleaned_delta = re.sub(r"<summary>.*?</summary>", "", cleaned_delta, flags=re.DOTALL)
+                                content_to_send += cleaned_delta
+
+                            else: # SHOW_THINK_TAGS is false
+                                if phase == "answer":
+                                    # Still need to clean the first answer chunk which might contain </details>
+                                    cleaned_delta = re.sub(r"</details>", "", delta_content)
+                                    content_to_send += cleaned_delta
+                            
+                            if content_to_send:
+                                openai_chunk = {
                                     "id": completion_id,
                                     "object": "chat.completion.chunk",
                                     "created": int(time.time()),
                                     "model": request.model,
-                                    "choices": [{
-                                        "index": 0,
-                                        "delta": {},
-                                        "finish_reason": "stop"
-                                    }]
+                                    "choices": [{"index": 0, "delta": {"content": content_to_send}, "finish_reason": None}]
                                 }
-                                yield f"data: {json.dumps(final_chunk)}\n\n"
-                                yield "data: [DONE]\n\n"
-                                return
-
-                            try:
-                                parsed = json.loads(payload)
-                                data = parsed.get("data", {})
-                                delta_content = data.get("delta_content", "")
-                                phase = data.get("phase", "")
-
-                                # Track phase changes
-                                if phase != current_phase:
-                                    current_phase = phase
-                                    logger.debug(f"Phase changed to: {phase}")
-
-                                # Apply filtering based on SHOW_THINK_TAGS and phase
-                                should_send_content = True
-
-                                if not settings.SHOW_THINK_TAGS and phase == "thinking":
-                                    should_send_content = False
-
-                                # Process and send content immediately if we should
-                                if delta_content and should_send_content:
-                                    # Minimal transformation for real-time streaming
-                                    transformed_delta = delta_content
-
-                                    if settings.SHOW_THINK_TAGS:
-                                        # Simple tag replacement for streaming
-                                        transformed_delta = re.sub(r'<details[^>]*>', '<think>', transformed_delta)
-                                        transformed_delta = transformed_delta.replace('</details>', '</think>')
-                                        transformed_delta = re.sub(r"<summary>.*?</summary>", "", transformed_delta, flags=re.DOTALL)
-
-                                    # Create and send OpenAI-compatible chunk immediately
-                                    openai_chunk = {
-                                        "id": completion_id,
-                                        "object": "chat.completion.chunk",
-                                        "created": int(time.time()),
-                                        "model": request.model,
-                                        "choices": [{
-                                            "index": 0,
-                                            "delta": {
-                                                "content": transformed_delta
-                                            },
-                                            "finish_reason": None
-                                        }]
-                                    }
-
-                                    # Yield immediately for real-time streaming
-                                    yield f"data: {json.dumps(openai_chunk)}\n\n"
-
-                            except json.JSONDecodeError:
-                                continue  # Skip non-JSON lines
+                                yield f"data: {json.dumps(openai_chunk)}\n\n"
+
+                        except json.JSONDecodeError:
+                            continue
 
         except httpx.RequestError as e:
-            logger.error(f"Streaming request error: {e}")
             await cookie_manager.mark_cookie_failed(cookie)
-            raise HTTPException(status_code=503, detail=f"Upstream service unavailable: {str(e)}")
+            raise HTTPException(status_code=503, detail=f"Upstream service unavailable: {str(e)}")
+        finally:
+            if is_in_think_block:
+                # Ensure the think tag is closed if stream ends unexpectedly
+                closing_chunk = {
+                    "id": completion_id, "object": "chat.completion.chunk", "created": int(time.time()), "model": request.model,
+                    "choices": [{"index": 0, "delta": {"content": "\n</think>"}, "finish_reason": None}]
+                }
+                yield f"data: {json.dumps(closing_chunk)}\n\n"
+
+            # Send final completion chunk
+            final_chunk = {
+                "id": completion_id, "object": "chat.completion.chunk", "created": int(time.time()), "model": request.model,
+                "choices": [{"index": 0, "delta": {}, "finish_reason": "stop"}]
+            }
+            yield f"data: {json.dumps(final_chunk)}\n\n"
+            yield "data: [DONE]\n\n"
+
+
+    async def aggregate_non_stream_response(self, request: ChatCompletionRequest) -> ChatCompletionResponse:
+        """Handle non-streaming response by aggregating the stream."""
+        import uuid
+
+        cookie = await cookie_manager.get_next_cookie()
+        if not cookie:
+            raise HTTPException(status_code=503, detail="No valid authentication available")
+
+        request_data = await self._build_request_payload(request)
+        headers = self._build_request_headers(cookie)
+        
+        content_parts = []
+        is_in_think_block = False
+
+        try:
+            async with self.client.stream("POST", settings.UPSTREAM_URL, json=request_data, headers=headers) as response:
+                if response.status_code == 401:
+                    await cookie_manager.mark_cookie_failed(cookie)
+                    raise HTTPException(status_code=401, detail="Invalid authentication")
+                if response.status_code != 200:
+                    await cookie_manager.mark_cookie_failed(cookie)
+                    error_text = await response.aread()
+                    raise HTTPException(status_code=response.status_code, detail=f"Upstream error: {error_text.decode()}")
+
+                await cookie_manager.mark_cookie_success(cookie)
+
+                buffer = ""
+                async for chunk in response.aiter_text():
+                    buffer += chunk
+                    while "\n" in buffer:
+                        line, buffer = buffer.split("\n", 1)
+                        if not line.startswith("data:"):
+                            continue
+
+                        payload = line[6:].strip()
+                        if payload == "[DONE]":
+                            break
+                        
+                        try:
+                            parsed = json.loads(payload)
+                            data = parsed.get("data", {})
+                            delta_content = data.get("delta_content", "")
+                            phase = data.get("phase", "")
+
+                            if settings.SHOW_THINK_TAGS:
+                                if phase == "thinking" and not is_in_think_block:
+                                    content_parts.append("<think>")
+                                    is_in_think_block = True
+                                elif phase == "answer" and is_in_think_block:
+                                    content_parts.append("</think>\n")
+                                    is_in_think_block = False
+                                
+                                cleaned_delta = re.sub(r"<details[^>]*>.*?</details>", "", delta_content, flags=re.DOTALL)
+                                cleaned_delta = re.sub(r"<summary>.*?</summary>", "", cleaned_delta, flags=re.DOTALL)
+                                content_parts.append(cleaned_delta)
+                            
+                            else: # SHOW_THINK_TAGS is false
+                                if phase == "answer":
+                                    cleaned_delta = re.sub(r"</details>", "", delta_content)
+                                    content_parts.append(cleaned_delta)
+
+                        except json.JSONDecodeError:
+                            continue
+            
+            if is_in_think_block:
+                content_parts.append("</think>")
+
+        except httpx.RequestError as e:
+            await cookie_manager.mark_cookie_failed(cookie)
+            raise HTTPException(status_code=503, detail=f"Upstream service unavailable: {str(e)}")
+
+        full_content = "".join(content_parts).strip()
+
+        return ChatCompletionResponse(
+            id=f"chatcmpl-{uuid.uuid4().hex[:29]}",
+            created=int(time.time()),
+            model=request.model,
+            choices=[
+                {
+                    "index": 0,
+                    "message": {"role": "assistant", "content": full_content},
+                    "finish_reason": "stop",
+                }
+            ],
+        )