Merge branch 'release/2.4.1'

fix(bilibili): 注入 dm_img 风控参数修复 wbi/playurl 412

BillNote_frontend/src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "../node_modules/@tauri-apps/cli/config.schema.json",
   "productName": "BiliNote",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "identifier": "com.jefferyhuang.bilinote",
   "build": {
     "frontendDist": "../dist",

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 本项目所有重要变更记录于此。格式参考 [Keep a Changelog](https://keepachangelog.com/zh-CN/1.1.0/)，遵循 [语义化版本](https://semver.org/lang/zh-CN/)。
 
+## [2.4.1] - 2026-06-17
+
+### Added
+
+- **YouTube Shorts 链接支持**：后端 URL 校验与 video id 提取支持 `youtube.com/shorts/<id>` 形态，Shorts 链接可正常提交生成笔记（#381）。
+
+### Fixed
+
+- **B 站 412（wbi/playurl 风控）**：B 站 `x/player/wbi/playurl` 网关新增 `dm_img_list`/`dm_img_str`/`dm_cover_img_str`/`dm_img_inter` + `web_location` 风控校验，缺失即返回 HTTP 412。多数视频网页内嵌 playinfo、yt-dlp 不调此 API；而网页不内嵌 playinfo、必须走 API 的视频（如 BV1X9L16oEgB）会撞上风控，刷新 cookie 无效、yt-dlp（含最新版）上游尚未适配。现于 wbi 签名前注入哑值 dm_img 风控参数（形态对齐 yt-dlp 自身 arc/search 用法）恢复 200（#410）。
+- **B 站分 P 视频字幕取错集**：分 P 视频提交 `?p=N` 时，字幕优先链路未透传 p 参数，始终取第 1 集 cid，导致笔记内容与实际下载的 p=N 音频不一致。现从 `data.pages[N-1]` 取对应分 P 的 cid（#409）。
+
 ## [2.4.0] - 2026-06-07
 
 ### Added

Dockerfile.complete

@@ -92,6 +92,8 @@ COPY --from=frontend-builder /tmp/frontend/dist /usr/share/nginx/html
 
 # 配置 nginx
 RUN rm -rf /etc/nginx/conf.d/default.conf
+# 删除默认 nginx site，防止 default_server 劫持 80 端口
+RUN rm -f /etc/nginx/sites-enabled/default
 COPY ./nginx/default.conf /etc/nginx/conf.d/default.conf
 
 # 创建 supervisor 配置
@@ -127,9 +129,8 @@ priority=20
 environment=BACKEND_PORT="%(ENV_BACKEND_PORT)s",BACKEND_HOST="%(ENV_BACKEND_HOST)s",TRANSCRIBER_TYPE="%(ENV_TRANSCRIBER_TYPE)s",WHISPER_MODEL_SIZE="%(ENV_WHISPER_MODEL_SIZE)s",FFMPEG_BIN_PATH="%(ENV_FFMPEG_BIN_PATH)s",HF_ENDPOINT="%(ENV_HF_ENDPOINT)s",STATIC="%(ENV_STATIC)s",OUT_DIR="%(ENV_OUT_DIR)s",DATA_DIR="%(ENV_DATA_DIR)s",NOTE_OUTPUT_DIR="%(ENV_NOTE_OUTPUT_DIR)s",DATABASE_URL="%(ENV_DATABASE_URL)s",IMAGE_BASE_URL="%(ENV_IMAGE_BASE_URL)s",ENV="%(ENV_ENV)s",GROQ_TRANSCRIBER_MODEL="%(ENV_GROQ_TRANSCRIBER_MODEL)s"
 EOF
 
-# 修改 nginx 配置以使用本地 backend
-RUN sed -i 's/proxy_pass http:\/\/backend:8483/proxy_pass http:\/\/127.0.0.1:8483/g' /etc/nginx/conf.d/default.conf && \
-    sed -i 's/proxy_pass http:\/\/frontend:80/proxy_pass http:\/\/127.0.0.1:8080/g' /etc/nginx/conf.d/default.conf
+# 修改 nginx 配置：backend 代理到本地，前端由 nginx 直接服务静态文件
+RUN sed -i 's/proxy_pass http:\/\/backend:8483/proxy_pass http:\/\/127.0.0.1:8483/g' /etc/nginx/conf.d/default.conf
 
 # 启动 supervisor
 # 推荐启动方式（覆盖默认 env）：

README.md

@@ -3,7 +3,7 @@
     <p align="center">
   <img src="./doc/icon.svg" alt="BiliNote Banner" width="50" height="50"  />
 </p>
-<h1 align="center" > BiliNote v2.4.0</h1>
+<h1 align="center" > BiliNote v2.4.1</h1>
 </div>
 
 <p align="center"><i>AI 视频笔记生成工具 让 AI 为你的视频做笔记</i></p>
@@ -386,18 +386,11 @@ docker-compose -f docker-compose.gpu.yml up --build -d
 
 ### Contact and Join-联系和加入社区
 
-扫码加入 BiliNote 交流微信群（共 5 个群，任选一个即可；二维码会定期更新，如已失效请到 [Issues](https://github.com/JefferyHcool/BiliNote/issues) 反馈）：
+扫描下方公众号二维码，关注后回复 **「交流群」** 即可获取最新的微信交流群二维码（群码会自动更新，避免过期失效）：
 
 <table align="center">
   <tr>
-    <td align="center"><img src="./doc/wechat-group-1.png" alt="BiliNote 交流群 1" width="200" /><br/>交流群 1</td>
-    <td align="center"><img src="./doc/wechat-group-2.png" alt="BiliNote 交流群 2" width="200" /><br/>交流群 2</td>
-    <td align="center"><img src="./doc/wechat-group-3.png" alt="BiliNote 交流群 3" width="200" /><br/>交流群 3</td>
-  </tr>
-  <tr>
-    <td align="center"><img src="./doc/wechat-group-4.png" alt="BiliNote 交流群 4" width="200" /><br/>交流群 4</td>
-    <td align="center"><img src="./doc/wechat-group-5.png" alt="BiliNote 交流群 5" width="200" /><br/>交流群 5</td>
-    <td></td>
+    <td align="center"><img src="./doc/wechat-gzh.png" alt="BiliNote 公众号" width="200" /><br/>BiliNote 公众号</td>
   </tr>
 </table>
 

backend/app/downloaders/bilibili_dm_patch.py

@@ -0,0 +1,71 @@
+"""
+Patch yt-dlp's Bilibili extractor to inject the dm_img_* / web_location
+risk-control parameters required by Bilibili's wbi/playurl gateway.
+
+Background
+----------
+Around 2026-06 Bilibili's ``x/player/wbi/playurl`` gateway began rejecting
+requests that omit the browser fingerprint params
+``dm_img_list`` / ``dm_img_str`` / ``dm_cover_img_str`` / ``dm_img_inter`` +
+``web_location`` with **HTTP 412**. Current yt-dlp (incl. the latest release)
+does not send these for the playurl endpoint, so any video whose web page does
+*not* inline ``playinfo`` — forcing yt-dlp onto the API path — fails with 412.
+Refreshing cookies does not help; the params themselves are missing.
+
+We inject dummy-but-well-formed values *before* wbi signing. The value shapes
+deliberately mirror yt-dlp's own usage of the same fields for the
+``x/space/wbi/arc/search`` endpoint (``BiliBiliSpaceIE``), which is the only
+place upstream currently sends them.
+"""
+import base64
+import logging
+import random
+import string
+
+logger = logging.getLogger(__name__)
+
+
+def build_dm_img_params() -> dict:
+    """Return dummy ``dm_img_*`` / ``web_location`` params the gateway expects."""
+    return {
+        'web_location': 1550101,
+        'dm_img_list': '[]',
+        'dm_img_str': base64.b64encode(
+            ''.join(random.choices(string.printable, k=random.randint(16, 64))).encode()
+        )[:-2].decode(),
+        'dm_cover_img_str': base64.b64encode(
+            ''.join(random.choices(string.printable, k=random.randint(32, 128))).encode()
+        )[:-2].decode(),
+        'dm_img_inter': '{"ds":[],"wh":[6093,6631,31],"of":[430,760,380]}',
+    }
+
+
+def apply_bilibili_dm_img_patch() -> bool:
+    """
+    Monkey-patch ``BilibiliBaseIE._download_playinfo`` to inject dm_img params.
+
+    Idempotent and defensive: returns ``True`` if the patch is in place (whether
+    applied now or previously), ``False`` if yt-dlp's internals could not be
+    patched (logged, never raised — the caller stays functional).
+    """
+    try:
+        from yt_dlp.extractor.bilibili import BilibiliBaseIE
+    except Exception as e:  # yt-dlp missing or module layout changed upstream
+        logger.warning("Bilibili dm_img patch skipped, cannot import extractor: %s", e)
+        return False
+
+    original = BilibiliBaseIE._download_playinfo
+    if getattr(original, '_bili_dm_patched', False):
+        return True
+
+    def _patched_download_playinfo(self, bvid, cid, headers=None, query=None):
+        # dm_* are merged into the query that the original method signs via
+        # _sign_wbi; caller-supplied query params (e.g. try_look/qn) take
+        # precedence over the injected dummies.
+        merged_query = {**build_dm_img_params(), **(query or {})}
+        return original(self, bvid, cid, headers=headers, query=merged_query)
+
+    _patched_download_playinfo._bili_dm_patched = True
+    BilibiliBaseIE._download_playinfo = _patched_download_playinfo
+    logger.info("Applied Bilibili wbi/playurl dm_img patch to yt-dlp BilibiliBaseIE")
+    return True

backend/app/downloaders/bilibili_downloader.py

@@ -8,6 +8,7 @@ from typing import Union, Optional, List
 import yt_dlp
 
 from app.downloaders.base import Downloader, DownloadQuality, QUALITY_MAP
+from app.downloaders.bilibili_dm_patch import apply_bilibili_dm_img_patch
 from app.downloaders.bilibili_subtitle import BilibiliSubtitleFetcher
 from app.models.notes_model import AudioDownloadResult
 from app.models.transcriber_model import TranscriptResult, TranscriptSegment
@@ -17,6 +18,11 @@ from app.services.cookie_manager import CookieConfigManager
 
 logger = logging.getLogger(__name__)
 
+# Inject the dm_img_* / web_location risk-control params Bilibili's wbi/playurl
+# gateway now requires; without them the API path returns HTTP 412. See
+# app/downloaders/bilibili_dm_patch.py for details.
+apply_bilibili_dm_img_patch()
+
 
 class BilibiliDownloader(Downloader, ABC):
     def __init__(self):

backend/app/downloaders/bilibili_subtitle.py

@@ -3,12 +3,13 @@
 
 流程：
 1. 从 URL 提 BV id（已有 utils.url_parser.extract_video_id）
-2. GET /x/web-interface/view?bvid=BVxxx → 拿 cid
-3. GET /x/player/wbi/v2?bvid=...&cid=... → 返回 data.subtitle.subtitles[]
+2. 从 URL 提 p 参数（分 P 序号，已有 utils.url_parser.extract_bilibili_p_number）
+3. GET /x/web-interface/view?bvid=BVxxx&p=N → 拿第 N 集的 cid
+4. GET /x/player/wbi/v2?bvid=...&cid=... → 返回 data.subtitle.subtitles[]
    每条带 subtitle_url（B 站后端已经签好 auth_key 的完整地址）
-4. 按优先级（人工 zh-CN > AI zh-CN > 任意 zh > 任意非空）选一条
-5. fetch subtitle_url → JSON {body:[{from,to,content,...}]}
-6. 解析为 TranscriptResult
+5. 按优先级（人工 zh-CN > AI zh-CN > 任意 zh > 任意非空）选一条
+6. fetch subtitle_url → JSON {body:[{from,to,content,...}]}
+7. 解析为 TranscriptResult
 
 AI 字幕需要登录态 cookie（SESSDATA）；通过 CookieConfigManager 注入。
 """
@@ -20,7 +21,7 @@ import requests
 from app.models.transcriber_model import TranscriptResult, TranscriptSegment
 from app.services.cookie_manager import CookieConfigManager
 from app.utils.logger import get_logger
-from app.utils.url_parser import extract_video_id
+from app.utils.url_parser import extract_video_id, extract_bilibili_p_number, resolve_bilibili_short_url
 
 logger = get_logger(__name__)
 
@@ -45,10 +46,13 @@ class BilibiliSubtitleFetcher:
             h["Cookie"] = self._cookie
         return h
 
-    def _get_cid(self, bvid: str) -> Optional[int]:
+    def _get_cid(self, bvid: str, p: Optional[int] = None) -> Optional[int]:
         url = "https://api.bilibili.com/x/web-interface/view"
+        params = {"bvid": bvid}
+        if p is not None and p >= 1:
+            params["p"] = p
         try:
-            resp = requests.get(url, params={"bvid": bvid}, headers=self._headers(), timeout=10)
+            resp = requests.get(url, params=params, headers=self._headers(), timeout=10)
             data = resp.json()
         except Exception as e:
             logger.warning(f"获取 cid 失败: {e}")
@@ -56,6 +60,19 @@ class BilibiliSubtitleFetcher:
         if data.get("code") != 0:
             logger.warning(f"view API 返回错误: code={data.get('code')}, msg={data.get('message')}")
             return None
+        # 分 P 视频：data.pages[N-1] 对应第 N 集
+        pages = data.get("data", {}).get("pages", [])
+        if pages:
+            if p is not None and 1 <= p <= len(pages):
+                cid = pages[p - 1].get("cid")
+                logger.info(f"分 P 视频: bvid={bvid} p={p} 共 {len(pages)} 集, 取第 {p} 集 cid={cid}")
+                return int(cid) if cid else None
+            else:
+                # 没有 p 参数或 p 超出范围，取第 1 集
+                cid = pages[0].get("cid")
+                logger.info(f"非分 P 或 p 无效: bvid={bvid} 取第 1 集 cid={cid}")
+                return int(cid) if cid else None
+        # 单集视频
         cid = data.get("data", {}).get("cid")
         return int(cid) if cid else None
 
@@ -109,14 +126,21 @@ class BilibiliSubtitleFetcher:
             return None
 
     def fetch_subtitles(self, video_url: str) -> Optional[TranscriptResult]:
+        # 统一 resolve 短链，避免 extract_video_id 和 extract_bilibili_p_number 各 resolve 一次
+        if "b23.tv" in video_url:
+            video_url = resolve_bilibili_short_url(video_url) or video_url
+
         bvid = extract_video_id(video_url, "bilibili")
         if not bvid:
             logger.info("无法从 URL 提取 BV id")
             return None
 
-        cid = self._get_cid(bvid)
+        # 提取分 P 序号
+        p = extract_bilibili_p_number(video_url)
+
+        cid = self._get_cid(bvid, p)
         if not cid:
-            logger.info(f"{bvid} 没有取到 cid")
+            logger.info(f"{bvid} (p={p}) 没有取到 cid")
             return None
 
         subtitles = self._list_subtitles(bvid, cid)
@@ -149,7 +173,7 @@ class BilibiliSubtitleFetcher:
             return None
 
         full_text = " ".join(s.text for s in segments)
-        logger.info(f"B站直拉字幕成功: {bvid} lan={lan} 共 {len(segments)} 段")
+        logger.info(f"B站直拉字幕成功: {bvid} p={p} lan={lan} 共 {len(segments)} 段")
         return TranscriptResult(
             language=lan,
             full_text=full_text,
@@ -158,6 +182,7 @@ class BilibiliSubtitleFetcher:
                 "source": "bilibili_player_api",
                 "bvid": bvid,
                 "cid": cid,
+                "p": p,
                 "lan": lan,
                 "ai_type": track.get("ai_type"),
             },

backend/app/utils/url_parser.py

@@ -23,8 +23,8 @@ def extract_video_id(url: str, platform: str) -> Optional[str]:
         return f"BV{match.group(1)}" if match else None
 
     elif platform == "youtube":
-        # 匹配 v=xxxxx 或 youtu.be/xxxxx，ID 长度通常为 11
-        match = re.search(r"(?:v=|youtu\.be/)([0-9A-Za-z_-]{11})", url)
+        # 匹配 v=xxxxx、youtu.be/xxxxx 或 shorts/xxxxx，ID 长度通常为 11
+        match = re.search(r"(?:v=|youtu\.be/|shorts/)([0-9A-Za-z_-]{11})", url)
         return match.group(1) if match else None
 
     elif platform == "douyin":
@@ -48,3 +48,36 @@ def resolve_bilibili_short_url(short_url: str) -> Optional[str]:
     except requests.RequestException as e:
         print(f"Error resolving short URL: {e}")
         return None
+
+
+def extract_bilibili_p_number(url: str) -> Optional[int]:
+    """
+    从 B 站分 P 视频 URL 中提取 p 参数（分 P 序号）。
+
+    支持格式：
+      - https://www.bilibili.com/video/BVxxx/?p=36
+      - https://www.bilibili.com/video/BVxxx?p=5
+      - https://b23.tv/xxxxx?p=10
+      - https://www.bilibili.com/video/BVxxx/pN (尾缀形式)
+
+    :param url: B 站视频链接
+    :return: 分 P 序号（从 1 开始），非分 P 视频返回 None
+    """
+    if "b23.tv" in url:
+        url = resolve_bilibili_short_url(url) or url
+
+    # 匹配 ?p=NNN 或 &p=NNN
+    match = re.search(r'[?&]p=(\d+)', url)
+    if match:
+        p = int(match.group(1))
+        if p >= 1:
+            return p
+
+    # 匹配 /pN 尾缀形式（较少见）
+    match = re.search(r'/p(\d+)(?:/?$|\?|&)', url)
+    if match:
+        p_val = int(match.group(1))
+        if p_val >= 1:
+            return p_val
+
+    return None

backend/app/validators/video_url_validator.py

@@ -4,7 +4,7 @@ from urllib.parse import urlparse
 
 SUPPORTED_PLATFORMS = {
     "bilibili": r"(https?://)?(www\.)?bilibili\.com/video/[a-zA-Z0-9]+",
-    "youtube": r"(https?://)?(www\.)?(youtube\.com/watch\?v=|youtu\.be/)[\w\-]+",
+    "youtube": r"(https?://)?(www\.)?(youtube\.com/(watch\?v=|shorts/)|youtu\.be/)[\w\-]+",
     "douyin": "douyin",
     "kuaishou": "kuaishou"
 }

backend/tests/test_bilibili_dm_patch.py

@@ -0,0 +1,94 @@
+"""
+TDD coverage for the Bilibili wbi/playurl dm_img risk-control patch.
+
+Background: around 2026-06, Bilibili's `x/player/wbi/playurl` gateway began
+rejecting requests that omit the browser fingerprint params
+(dm_img_list / dm_img_str / dm_cover_img_str / dm_img_inter + web_location)
+with HTTP 412. yt-dlp (incl. latest) does not yet send these for playurl, so
+videos whose web page does not inline playinfo (forcing the API call) fail.
+
+These tests verify our yt-dlp monkey-patch injects those params *before* wbi
+signing, and that caller-supplied query params still win.
+"""
+import importlib.util
+import pathlib
+import unittest
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+MODULE_PATH = ROOT / "app" / "downloaders" / "bilibili_dm_patch.py"
+spec = importlib.util.spec_from_file_location("bilibili_dm_patch", MODULE_PATH)
+if spec is None or spec.loader is None:
+    raise ImportError("bilibili_dm_patch module spec not found")
+bilibili_dm_patch = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(bilibili_dm_patch)
+
+REQUIRED_KEYS = {
+    "web_location",
+    "dm_img_list",
+    "dm_img_str",
+    "dm_cover_img_str",
+    "dm_img_inter",
+}
+
+
+class BuildDmImgParamsTest(unittest.TestCase):
+    def test_contains_all_required_risk_control_keys(self):
+        params = bilibili_dm_patch.build_dm_img_params()
+        self.assertTrue(REQUIRED_KEYS.issubset(params.keys()))
+
+    def test_web_location_is_expected_sentinel(self):
+        self.assertEqual(bilibili_dm_patch.build_dm_img_params()["web_location"], 1550101)
+
+
+class ApplyPatchTest(unittest.TestCase):
+    def setUp(self):
+        try:
+            import yt_dlp.extractor.bilibili  # noqa: F401
+        except Exception as exc:  # pragma: no cover - env without yt-dlp
+            self.skipTest(f"yt-dlp not importable: {exc}")
+
+    def test_patch_is_idempotent(self):
+        from yt_dlp.extractor.bilibili import BilibiliBaseIE
+
+        self.assertTrue(bilibili_dm_patch.apply_bilibili_dm_img_patch())
+        first = BilibiliBaseIE._download_playinfo
+        self.assertTrue(bilibili_dm_patch.apply_bilibili_dm_img_patch())
+        self.assertIs(BilibiliBaseIE._download_playinfo, first)
+
+    def test_dm_params_reach_wbi_signing_with_caller_query_preserved(self):
+        from yt_dlp import YoutubeDL
+        from yt_dlp.extractor.bilibili import BilibiliBaseIE
+
+        bilibili_dm_patch.apply_bilibili_dm_img_patch()
+
+        captured = {}
+
+        def fake_sign_wbi(params, video_id):
+            # Capture the exact params handed to wbi signing (just before the
+            # HTTP request). dm_* must already be present here, pre-signature.
+            captured.update(params)
+            return params
+
+        def fake_download_json(url, video_id, **kwargs):
+            # Avoid any network; the real playurl call would 412 without dm_*.
+            return {"data": {"ok": True}}
+
+        ie = BilibiliBaseIE(YoutubeDL({"quiet": True}))
+        ie._sign_wbi = fake_sign_wbi
+        ie._download_json = fake_download_json
+
+        ie._download_playinfo("BV1X9L16oEgB", 4242, headers={}, query={"qn": 64})
+
+        self.assertTrue(
+            REQUIRED_KEYS.issubset(captured.keys()),
+            f"missing dm_* keys, got: {sorted(captured)}",
+        )
+        self.assertEqual(captured["web_location"], 1550101)
+        # caller-supplied query must survive the merge
+        self.assertEqual(captured["qn"], 64)
+        # the original method still builds its base params
+        self.assertEqual(captured["bvid"], "BV1X9L16oEgB")
+
+
+if __name__ == "__main__":
+    unittest.main()

backend/tests/test_video_url_support.py

@@ -0,0 +1,50 @@
+import importlib.util
+import pathlib
+import unittest
+
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+
+
+def _load_module(name, relative_path):
+    module_path = ROOT / relative_path
+    spec = importlib.util.spec_from_file_location(name, module_path)
+    if spec is None or spec.loader is None:
+        raise ImportError(f"{name} module spec not found")
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+url_parser = _load_module("url_parser", pathlib.Path("app") / "utils" / "url_parser.py")
+video_url_validator = _load_module(
+    "video_url_validator",
+    pathlib.Path("app") / "validators" / "video_url_validator.py",
+)
+
+
+class TestVideoUrlSupport(unittest.TestCase):
+    def test_extract_youtube_video_id_from_supported_url_shapes(self):
+        expected_id = "dQw4w9WgXcQ"
+
+        cases = [
+            f"https://www.youtube.com/watch?v={expected_id}",
+            f"https://youtu.be/{expected_id}",
+            f"https://www.youtube.com/shorts/{expected_id}",
+        ]
+
+        for url in cases:
+            with self.subTest(url=url):
+                self.assertEqual(
+                    url_parser.extract_video_id(url, "youtube"),
+                    expected_id,
+                )
+
+    def test_accepts_youtube_shorts_url(self):
+        url = "https://www.youtube.com/shorts/dQw4w9WgXcQ"
+
+        self.assertTrue(video_url_validator.is_supported_video_url(url))
+
+
+if __name__ == "__main__":
+    unittest.main()

nginx/default.conf

@@ -2,19 +2,18 @@ server {
   listen 80;
   client_max_body_size 10G;
 
-  # gzip 压缩
   gzip on;
   gzip_vary on;
   gzip_min_length 1024;
   gzip_proxied any;
   gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;
 
-  # 所有非 /api 请求全部代理给 frontend 容器
   location / {
-    proxy_pass http://frontend:80;
+    root /usr/share/nginx/html;
+    index index.html;
+    try_files $uri $uri/ /index.html;
   }
 
-  # 所有 /api 请求代理给 backend 容器
   location /api/ {
     proxy_pass http://backend:8483;
     proxy_set_header Host $host;