diff --git a/requirements.lock.txt b/requirements.lock.txt
index 13e2dce..6680f3b 100644
--- a/requirements.lock.txt
+++ b/requirements.lock.txt
@@ -13,7 +13,8 @@ flask==2.3.3
 flask-socketio==5.3.6
 flask-cors==3.0.10
 werkzeug==2.3.7
-httpx==0.28.1
+httpx[http2]==0.28.1
+h2==4.1.0  # 由 httpx[http2] 引入
 openai==2.8.1
 cryptography==43.0.3
 pillow==9.3.0
diff --git a/requirements.txt b/requirements.txt
index fef2642..7a4667b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ flask
 flask-socketio
 flask-cors
 werkzeug
-httpx
+httpx[http2]
 openai
 cryptography
 pillow
diff --git a/scripts/gen_requirements_lock.py b/scripts/gen_requirements_lock.py
index ba0bad7..8df0dde 100644
--- a/scripts/gen_requirements_lock.py
+++ b/scripts/gen_requirements_lock.py
@@ -35,41 +35,93 @@ _LOCK_HEADER = """\
 """
 
 
-def _parse_requirement_names(text: str) -> list[str]:
-    """从 requirements.txt 提取包名（忽略注释、空行、已带版本约束的尾巴）。"""
-    names: list[str] = []
+def _parse_requirements(text: str) -> list[tuple[str, list[str]]]:
+    """从 requirements.txt 提取 (包名, extras 列表)。
+
+    忽略注释/空行；去掉版本约束；保留 extras。
+    例： httpx[http2]>=0.28 -> ("httpx", ["http2"]) ； flask -> ("flask", [])
+    """
+    items: list[tuple[str, list[str]]] = []
     for raw in text.splitlines():
         line = raw.strip()
         if not line or line.startswith("#"):
             continue
-        # 去掉版本约束/extras，仅留包名： flask[async]>=2 -> flask
-        name = re.split(r"[<>=!~\[ ;]", line, 1)[0].strip()
-        if name:
-            names.append(name)
-    return names
+        # 先剥掉版本约束/环境标记： name[extra]>=1 ; marker
+        head = re.split(r"[<>=!~ ;]", line, 1)[0].strip()
+        m = re.match(r"^([A-Za-z0-9._-]+)(?:\[([^\]]*)\])?$", head)
+        if not m:
+            continue
+        name = m.group(1)
+        extras = [e.strip() for e in (m.group(2) or "").split(",") if e.strip()]
+        items.append((name, extras))
+    return items
+
+
+def _extra_dependency_names(pkg: str, extras: list[str]) -> list[str]:
+    """解析某包在指定 extras 下引入的依赖包名（用于一并锁定其传递依赖）。
+
+    例： httpx + ["http2"] -> ["h2"]。仅返回包名，版本由调用方查实际安装值。
+    无法解析时返回空列表（静默降级）。
+    """
+    if not extras:
+        return []
+    try:
+        requires = md.requires(pkg) or []
+    except md.PackageNotFoundError:
+        return []
+    wanted = {e.lower() for e in extras}
+    found: list[str] = []
+    for req in requires:
+        # 仅取声明了 extra == '<name>' 且匹配我们启用的 extra 的依赖
+        if "extra ==" not in req:
+            continue
+        if not any(f"extra == '{e}'" in req or f'extra == "{e}"' in req for e in wanted):
+            continue
+        dep = re.split(r"[<>=!~ ;]", req.strip(), 1)[0].strip()
+        dep = re.sub(r"\[[^\]]*\]", "", dep)  # 去掉 extra 自身可能带的 []
+        if dep and dep not in found:
+            found.append(dep)
+    return found
 
 
 def main() -> int:
     if not REQ_PATH.exists():
         print(f"找不到 {REQ_PATH}", file=sys.stderr)
         return 1
-    names = _parse_requirement_names(REQ_PATH.read_text(encoding="utf-8"))
-    if not names:
+    items = _parse_requirements(REQ_PATH.read_text(encoding="utf-8"))
+    if not items:
         print("requirements.txt 中没有可锁定的依赖。", file=sys.stderr)
         return 1
 
     lines: list[str] = []
     missing: list[str] = []
-    for name in names:
+    seen: set[str] = set()  # 去重（extra 依赖可能与直接依赖重复）
+
+    for name, extras in items:
+        spec = f"{name}[{','.join(extras)}]" if extras else name
         try:
             version = md.version(name)
-            lines.append(f"{name}=={version}")
+            lines.append(f"{spec}=={version}")
         except md.PackageNotFoundError:
             missing.append(name)
-            lines.append(f"# {name}  (未安装，无法锁定版本)")
+            lines.append(f"# {spec}  (未安装，无法锁定版本)")
+        seen.add(name.lower())
+
+        # 一并锁定该包在启用 extras 下引入的依赖（如 httpx[http2] -> h2），
+        # 否则干净环境装 lock 时不会拉到这些可选依赖。
+        for dep in _extra_dependency_names(name, extras):
+            if dep.lower() in seen:
+                continue
+            seen.add(dep.lower())
+            try:
+                dep_ver = md.version(dep)
+                lines.append(f"{dep}=={dep_ver}  # 由 {name}[{','.join(extras)}] 引入")
+            except md.PackageNotFoundError:
+                missing.append(dep)
+                lines.append(f"# {dep}  (由 {name} extra 引入，但未安装)")
 
     LOCK_PATH.write_text(_LOCK_HEADER + "\n" + "\n".join(lines) + "\n", encoding="utf-8")
-    print(f"已写出 {LOCK_PATH}（{len(names)} 项依赖）")
+    print(f"已写出 {LOCK_PATH}（{len(items)} 项直接依赖 + extra 传递依赖）")
     for line in lines:
         print("  " + line)
     if missing: