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proxy.ts
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proxy.ts
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import type * as http from 'node:http'
import type * as net from 'node:net'
import httpProxy from 'http-proxy'
import type { Connect } from 'types/connect'
import type { HttpProxy } from 'types/http-proxy'
import colors from 'picocolors'
import { HMR_HEADER } from '../ws'
import { createDebugger, isObject } from '../../utils'
import type { CommonServerOptions, ResolvedConfig } from '../..'
const debug = createDebugger('vite:proxy')
export interface ProxyOptions extends HttpProxy.ServerOptions {
/**
* rewrite path
*/
rewrite?: (path: string) => string
/**
* configure the proxy server (e.g. listen to events)
*/
configure?: (proxy: HttpProxy.Server, options: ProxyOptions) => void
/**
* webpack-dev-server style bypass function
*/
bypass?: (
req: http.IncomingMessage,
res: http.ServerResponse,
options: ProxyOptions
) => void | null | undefined | false | string
}
export function proxyMiddleware(
httpServer: http.Server | null,
options: NonNullable<CommonServerOptions['proxy']>,
config: ResolvedConfig
): Connect.NextHandleFunction {
// lazy require only when proxy is used
const proxies: Record<string, [HttpProxy.Server, ProxyOptions]> = {}
Object.keys(options).forEach((context) => {
let opts = options[context]
if (!opts) {
return
}
if (typeof opts === 'string') {
opts = { target: opts, changeOrigin: true } as ProxyOptions
}
const proxy = httpProxy.createProxyServer(opts) as HttpProxy.Server
proxy.on('error', (err, req, originalRes) => {
// When it is ws proxy, res is net.Socket
const res = originalRes as http.ServerResponse | net.Socket
if ('req' in res) {
config.logger.error(
`${colors.red(`http proxy error:`)}\n${err.stack}`,
{
timestamp: true,
error: err
}
)
if (!res.headersSent && !res.writableEnded) {
res
.writeHead(500, {
'Content-Type': 'text/plain'
})
.end()
}
} else {
config.logger.error(`${colors.red(`ws proxy error:`)}\n${err.stack}`, {
timestamp: true,
error: err
})
res.end()
}
})
if (opts.configure) {
opts.configure(proxy, opts)
}
// clone before saving because http-proxy mutates the options
proxies[context] = [proxy, { ...opts }]
})
if (httpServer) {
httpServer.on('upgrade', (req, socket, head) => {
const url = req.url!
for (const context in proxies) {
if (doesProxyContextMatchUrl(context, url)) {
const [proxy, opts] = proxies[context]
if (
(opts.ws || opts.target?.toString().startsWith('ws:')) &&
req.headers['sec-websocket-protocol'] !== HMR_HEADER
) {
if (opts.rewrite) {
req.url = opts.rewrite(url)
}
debug(`${req.url} -> ws ${opts.target}`)
proxy.ws(req, socket, head)
return
}
}
}
})
}
// Keep the named function. The name is visible in debug logs via `DEBUG=connect:dispatcher ...`
return function viteProxyMiddleware(req, res, next) {
const url = req.url!
for (const context in proxies) {
if (doesProxyContextMatchUrl(context, url)) {
const [proxy, opts] = proxies[context]
const options: HttpProxy.ServerOptions = {}
if (opts.bypass) {
const bypassResult = opts.bypass(req, res, opts)
if (typeof bypassResult === 'string') {
req.url = bypassResult
debug(`bypass: ${req.url} -> ${bypassResult}`)
return next()
} else if (isObject(bypassResult)) {
Object.assign(options, bypassResult)
debug(`bypass: ${req.url} use modified options: %O`, options)
return next()
} else if (bypassResult === false) {
debug(`bypass: ${req.url} -> 404`)
return res.end(404)
}
}
debug(`${req.url} -> ${opts.target || opts.forward}`)
if (opts.rewrite) {
req.url = opts.rewrite(req.url!)
}
proxy.web(req, res, options)
return
}
}
next()
}
}
function doesProxyContextMatchUrl(context: string, url: string): boolean {
return (
(context.startsWith('^') && new RegExp(context).test(url)) ||
url.startsWith(context)
)
}