仆人缺少CORS标头"Access-Control-Allow-Origin" [英] CORS header ‘Access-Control-Allow-Origin’ missing in servant

问题描述

使用 Network.Wai.Handler.Warp 函数中的 run 到服务器rest api

using the run from Network.Wai.Handler.Warp function to server rest api

run :: Port -> Application -> IO ()

但是在执行 post 请求时，出现错误 CORS标头"Access-Control-Allow-Origin" .任何想法如何克服仆人/haskell中的问题

but while doing post request, getting an error CORS header ‘Access-Control-Allow-Origin’. any idea how to overcome this in servant/haskell

推荐答案

您可以使用

You could use wai-cors middleware to add CORS headers.

最后，您会得到类似的东西

At the end you'll have something like

app = simpleCors $ serve api serverImpl

其中

• simpleCors 是来自 wai-cors
的中间件
• serve 将仆人处理程序转换为 wai Application
• api ::代理YourAPI
• serverImpl 是您的处理程序的实现

• simpleCors is a Middleware from wai-cors
• serve turns servant handlers into wai Application
• api :: Proxy YourAPI
• serverImpl is your handlers' implementation

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