使用warp监听特定主机 [英] Listen on specific host using warp

问题描述

使用 warp 应用程序.org / package / warp-2.1.2.1 / docs / Network-Wai-Handler-Warp.html＃v％3arunrel =noreferrer> run ，它监听所有IP地址。

When running a warp application using run, it listens on all IP adresses.

出于安全原因，我只想监听 localhost ，处理使用反向代理进行远程访问。

For security reasons, I want to listen on localhost only, handling remote access using a reverse proxy.

如何调用 run 来仅监听特定的主机/ IP？

How do I need to call run to only listen on a specific host/IP?

注意：这个问题故意显示没有研究工作，因为它被回答为Q& A-Style。

Note: This question intentionally shows no research effort as it was answered Q&A-Style.

推荐答案

目前接受的答案因管道和/或变形的变化而中断。 Warp不再导出 Host 构造函数。但是你不需要它，因为 HostPreference 类型支持OverloadedStrings扩展，所以你可以直接使用字符串。

The currently accepted answer got broken by changes to conduit and/or warp. Warp no longer exports a Host constructor. But you don't need it, because the HostPreference type supports the OverloadedStrings extension, so you can just use a string directly.

此示例还通过切换到 setPort 和 setHost 来消除弃用警告。

This example also eliminates the deprecation warnings by switching to setPort and setHost.

{-# LANGUAGE OverloadedStrings #-}

import Network.Wai (responseLBS)
import Network.Wai.Handler.Warp
import Network.HTTP.Types (status200)
import Network.HTTP.Types.Header (hContentType)

main = do
    let port = 3000
    putStrLn $ "Listening on port " ++ show port
    let settings = setPort port $ setHost "127.0.0.1" defaultSettings
    runSettings settings app

app req = return $
    responseLBS status200 [(hContentType, "text/plain")] "Hello world!"

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