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Spring Cloud Gateway 返回多个 access-control-allow-origin
source link: https://www.v2ex.com/t/840010
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如下图所示，OPTIONS 请求的 Response Headers 中存在两个 access-control-allow-headers 、access-control-allow-methods 、access-control-allow-origin 。
我看了Doubled CORS headers after upgrade to Greenwich · Issue #728 · spring-cloud/spring-cloud-gateway，加上了DedupeResponseHeader=Access-Control-Allow-Credentials Access-Control-Allow-Origin这个 filter ，但是并没有效果，还是存在两个 headers 。
我尝试过“去除 downstream 的 CORS 配置，保留 gateway 的”，结果还是存在两个 headers 。我尝试过“去除 gateway 的 CORS 配置，保留 downstream 的”，结果是 header 都没有了，如下图所示：
实在想不明白是哪里出现问题了🤐，看看大家有没有点头绪。
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