blocked by CORs pollcy: Response to preflinht reguest doesn't pass access control check: It does not have HTTp ok status

引用和中提到的错误是关于CORS (跨域资源共享)策略的问题。CORS是一种安全机制，用于限制从一个域名下的网页去请求另一个域名下的资源的方式。当浏览器发起跨域请求时，服务器需要在响应中添加特定的头部字段来允许请求的源进行访问。如果服务器没有正确配置这些头部字段，浏览器就会阻止访问，并报错"blocked by CORS policy"。

在你提供的引文中，报错信息中提到的问题是"Response to preflight request doesn't pass access control check: It does not have HTTP ok status"。这意味着在进行跨域请求时，预检请求的响应状态码不是HTTP 200 OK，而是其他的状态码。

要解决这个问题，可以参考以下步骤：
1. 检查预检请求的响应是否返回了HTTP 200 OK状态码。如果没有，请确保服务器正确处理预检请求，并返回正确的状态码。
2. 检查服务器是否正确配置了"Access-Control-Allow-Origin"头部字段。这个字段的值应该设置为允许访问的源，可以是具体的域名或通配符"*"，表示允许任何源进行访问。
3. 检查服务器是否正确处理OPTIONS请求。在进行跨域请求时，浏览器会首先发送一个OPTIONS请求进行预检，服务器需要正确处理这个请求，并返回合适的响应。

通过正确配置服务器的CORS策略，你应该能够解决"blocked by CORS policy"的问题，并使跨域请求能够成功进行。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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