refactor(fingerprint): 移除请求头构建路径中的 per-key 指纹定制化注入

headers.py 删除 build_browser_fingerprint_headers / build_anthropic_extra_headers
函数及相关辅助，改为直接使用固定常量；PassthroughRequestBuilder 移除
Claude 格式的指纹注入步骤；Antigravity constants 移除 per-key 指纹
覆盖逻辑，统一使用进程级固定值。

src/api/handlers/base/request_builder.py

@@ -22,8 +22,6 @@ from typing import Any
 from src.core.api_format import (
     UPSTREAM_DROP_HEADERS,
     HeaderBuilder,
-    build_anthropic_extra_headers,
-    build_browser_fingerprint_headers,
     get_auth_config_for_endpoint,
     make_signature_key,
 )
@@ -31,7 +29,6 @@ from src.core.crypto import crypto_service
 from src.models.endpoint_models import _CONDITION_OPS, _TYPE_IS_VALUES, parse_re_flags
 from src.services.provider.auth import get_provider_auth  # noqa: F401
 from src.services.provider.envelope import ProviderEnvelope
-from src.services.provider.request_context import get_current_fingerprint
 
 # ==============================================================================
 # 统一的头部配置常量
@@ -1243,13 +1240,7 @@ class PassthroughRequestBuilder(RequestBuilder):
         if header_rules:
             builder.apply_rules(header_rules, protected_keys)
 
-        # 4. 注入 per-key 指纹头（仅 Claude 格式需要浏览器指纹绕过 Cloudflare 检测）。
+        # 4. 添加额外头部
-        if str(endpoint_sig or "").strip().lower().startswith("claude:"):
-            fp = get_current_fingerprint()
-            builder.add_many(build_browser_fingerprint_headers(fp))
-            builder.add_many(build_anthropic_extra_headers(fp))
-
-        # 5. 添加额外头部
         effective_extra_headers = self._merge_extra_headers_with_original(
             original_headers,
             extra_headers,
@@ -1258,10 +1249,10 @@ class PassthroughRequestBuilder(RequestBuilder):
         if effective_extra_headers:
             builder.add_many(effective_extra_headers)
 
-        # 6. 设置认证头（最高优先级，上游始终使用 header 认证）
+        # 5. 设置认证头（最高优先级，上游始终使用 header 认证）
         builder.add(auth_header, auth_value)
 
-        # 7. 确保有 Content-Type
+        # 6. 确保有 Content-Type
         headers = builder.build()
         if not any(k.lower() == "content-type" for k in headers):
             headers["Content-Type"] = "application/json"

src/core/api_format/__init__.py

@@ -32,8 +32,6 @@ from src.core.api_format.headers import (
     HeaderBuilder,
     build_adapter_base_headers_for_endpoint,
     build_adapter_headers_for_endpoint,
-    build_anthropic_extra_headers,
-    build_browser_fingerprint_headers,
     build_upstream_headers_for_endpoint,
     detect_capabilities_for_endpoint,
     extract_client_api_key_for_endpoint,
@@ -121,8 +119,6 @@ __all__ = [
     "detect_capabilities_for_endpoint",
     "HeaderBuilder",
     "build_upstream_headers_for_endpoint",
-    "build_browser_fingerprint_headers",
-    "build_anthropic_extra_headers",
     "merge_headers_with_protection",
     "filter_response_headers",
     "redact_headers_for_log",

src/core/api_format/headers.py

@@ -14,7 +14,7 @@ from __future__ import annotations
 
 import json
 from collections.abc import Set as AbstractSet
-from typing import TYPE_CHECKING, Any
+from typing import Any
 
 from src.core.api_format.enums import ApiFamily
 from src.core.api_format.metadata import (
@@ -26,9 +26,6 @@ from src.core.api_format.metadata import (
 from src.core.api_format.signature import EndpointSignature, parse_signature_key
 from src.core.logger import logger
 
-if TYPE_CHECKING:
-    from src.services.provider.fingerprint import FingerprintProfile
-
 # =============================================================================
 # 头部常量定义
 # =============================================================================
@@ -128,59 +125,6 @@ RESPONSE_DROP_HEADERS: frozenset[str] = (
 )
 
 
-_DEFAULT_CHROME_MAJOR = "140"
-
-
-def _extract_chrome_major(version: str) -> str:
-    value = str(version or "").strip()
-    if not value:
-        return _DEFAULT_CHROME_MAJOR
-    return value.split(".", 1)[0] or _DEFAULT_CHROME_MAJOR
-
-
-def _resolve_sec_ch_platform(fp: FingerprintProfile) -> str:
-    os_name = (fp.stainless_os or "").strip().lower()
-    platform_info = (fp.platform_info or "").strip().lower()
-
-    if os_name.startswith("win") or "windows" in platform_info:
-        return '"Windows"'
-    if os_name in {"mac", "macos", "darwin"} or "darwin" in platform_info:
-        return '"macOS"'
-    return '"Linux"'
-
-
-def build_browser_fingerprint_headers(fp: FingerprintProfile | None = None) -> dict[str, str]:
-    """Build browser fingerprint headers, optionally overridden by per-key fingerprint."""
-    headers = {**BROWSER_FINGERPRINT_HEADERS}
-    if fp is None:
-        return headers
-
-    chrome_major = _extract_chrome_major(fp.chrome_version)
-    headers["User-Agent"] = fp.user_agent or headers["User-Agent"]
-    headers["sec-ch-ua"] = f'"Not=A?Brand";v="24", "Chromium";v="{chrome_major}"'
-    headers["sec-ch-ua-platform"] = _resolve_sec_ch_platform(fp)
-    return headers
-
-
-def build_anthropic_extra_headers(fp: FingerprintProfile | None = None) -> dict[str, str]:
-    """Build Anthropic extra headers, optionally overridden by per-key fingerprint."""
-    headers = {**_ANTHROPIC_EXTRA_HEADERS}
-    if fp is None:
-        return headers
-
-    headers["x-stainless-os"] = fp.stainless_os or headers["x-stainless-os"]
-    headers["x-stainless-arch"] = fp.stainless_arch or headers["x-stainless-arch"]
-    headers["x-stainless-package-version"] = (
-        fp.stainless_package_version or headers["x-stainless-package-version"]
-    )
-    # browser:chrome runtime-version = Chrome 版本；
-    # CLI 路径(ClaudeCodeEnvelope)使用 Node.js，其 extra_headers 会以 fp.stainless_runtime_version 覆盖。
-    headers["x-stainless-runtime-version"] = (
-        fp.chrome_version or headers["x-stainless-runtime-version"]
-    )
-    return headers
-
-
 # =============================================================================
 # 请求头规范化
 # =============================================================================
@@ -624,12 +568,12 @@ def build_adapter_base_headers_for_endpoint(
     auth_value = f"Bearer {api_key}" if auth_type == "bearer" else api_key
 
     # 以浏览器指纹为底层默认值，绕过 Cloudflare 等反爬防护
-    headers: dict[str, str] = build_browser_fingerprint_headers()
+    headers: dict[str, str] = {**BROWSER_FINGERPRINT_HEADERS}
 
     # Claude API family 额外注入 Anthropic 专属 header
     definition = resolve_endpoint_definition(endpoint)
     if definition and definition.api_family == ApiFamily.CLAUDE:
-        headers.update(build_anthropic_extra_headers())
+        headers.update(_ANTHROPIC_EXTRA_HEADERS)
 
     headers[auth_header] = auth_value
     headers["Content-Type"] = "application/json"

src/services/provider/adapters/antigravity/constants.py

@@ -14,8 +14,6 @@ import uuid
 # ============== API 端点 ==============
 # 唯一定义在 core 层，此处 re-export 保持向后兼容
 from src.core.provider_templates.fixed_providers import ANTIGRAVITY_PROD_URL as PROD_BASE_URL
-from src.services.provider.fingerprint import resolve_platform_token
-from src.services.provider.request_context import get_current_fingerprint
 
 DAILY_BASE_URL = "https://daily-cloudcode-pa.googleapis.com"
 SANDBOX_BASE_URL = "https://daily-cloudcode-pa.sandbox.googleapis.com"
@@ -114,43 +112,17 @@ URL_UNAVAILABLE_TTL_SECONDS = 300  # 5 分钟
 _SESSION_ID = uuid.uuid4().hex  # 每次进程启动生成一个固定 session ID
 
 
-def _normalize_node_version(raw: str | None) -> str:
-    text = str(raw or "").strip()
-    if text.startswith(("v", "V")):
-        text = text[1:]
-    return text or "18.18.2"
-
-
 def get_v1internal_extra_headers() -> dict[str, str]:
     """构建 v1internal 请求需要的额外 header（对齐 AM upstream/client.rs）。"""
-    fp = get_current_fingerprint()
     with _ua_lock:
         version = _ua_version
 
-    user_agent = get_http_user_agent()
-    session_id = _SESSION_ID
-    node_version = "18.18.2"
-
-    if fp:
-        user_agent = _build_antigravity_http_user_agent(
-            platform_token=resolve_platform_token(
-                platform_info=fp.platform_info,
-                stainless_os=fp.stainless_os,
-                stainless_arch=fp.stainless_arch,
-            ),
-            version=version,
-            chrome_version=fp.chrome_version or _FALLBACK_CHROME,
-            electron_version=fp.electron_version or _FALLBACK_ELECTRON,
-        )
-        session_id = fp.vscode_session_id or _SESSION_ID
-        node_version = _normalize_node_version(fp.node_version)
-
     return {
-        "User-Agent": user_agent,
+        "User-Agent": get_http_user_agent(),
         "x-client-name": "antigravity",
         "x-client-version": version,
-        "x-vscode-sessionid": session_id,
+        "x-vscode-sessionid": _SESSION_ID,
-        "x-goog-api-client": f"gl-node/{node_version} fire/0.8.6 grpc/1.10.x",
+        "x-goog-api-client": "gl-node/18.18.2 fire/0.8.6 grpc/1.10.x",
     }