python config_error ai_generated true

运行时错误：请求的资源上不存在'Access-Control-Allow-Origin'头

RuntimeError: No 'Access-Control-Allow-Origin' header is present on the requested resource

ID: python/starlette-cors-error

其他格式: JSON · Markdown 中文 · English
80%修复率
84%置信度
0证据数
2024-06-18首次发现

版本兼容性

版本状态引入弃用备注
3.x active — — —

根因分析

Starlette应用未配置CORS中间件，因此跨域请求被浏览器阻止。

English

Starlette application does not have CORS middleware configured, so cross-origin requests are blocked by the browser.

generic

解决方案

  1. 95% 成功率 Add CORSMiddleware from Starlette 
    from starlette.middleware.cors import CORSMiddleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)
  2. 90% 成功率 Use FastAPI's built-in CORS middleware if using FastAPI 
    from fastapi.middleware.cors import CORSMiddleware
app.add_middleware(CORSMiddleware, allow_origins=["*"])

无效尝试

常见但无效的做法:

  1. Adding CORS headers manually in the response 75% 失败

    Doesn't handle preflight OPTIONS requests, causing browser to block the actual request.

  2. Disabling CORS check in browser 90% 失败

    Not a production solution; only works for local testing.