python network_error ai_generated true

CORS错误：来源 http://example.com 未被 Access-Control-Allow-Origin 允许

CORS error: Origin http://example.com is not allowed by Access-Control-Allow-Origin

ID: python/flask-cors-error-origin

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
0证据数
2025-01-10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

服务器上的CORS策略不允许请求的来源。

English

The CORS policy on the server does not allow the requesting origin.

generic

解决方案

  1. 95% 成功率 Use flask-cors to enable CORS for specific origins. 
    from flask_cors import CORS
CORS(app, origins=['http://example.com'])
  2. 85% 成功率 Set CORS headers manually in a response. 
    @app.after_request
def add_cors_headers(response):
    response.headers['Access-Control-Allow-Origin'] = 'http://example.com'
    return response

无效尝试

常见但无效的做法:

  1. Adding a wildcard '*' to allowed origins but not handling credentials. 70% 失败

    Wildcard origins cannot be used with credentials in some cases.

  2. Ignoring the error and assuming it will work on production. 90% 失败

    The error will persist in production if not fixed.