28 lines
1.1 KiB
TypeScript
28 lines
1.1 KiB
TypeScript
import proxyServer from "http-proxy"
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import { HttpCode } from "../common/http"
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export const proxy = proxyServer.createProxyServer({})
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// The error handler catches when the proxy fails to connect (for example when
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// there is nothing running on the target port).
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proxy.on("error", (error, _, res) => {
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// This could be for either a web socket or a regular request. Despite what
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// the types say, writeHead() will not exist on web socket requests (nor will
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// status() from Express). But writing out the code manually does not work
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// for regular requests thus the branching behavior.
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if (typeof res.writeHead !== "undefined") {
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res.writeHead(HttpCode.ServerError)
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res.end(error.message)
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} else {
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res.end(`HTTP/1.1 ${HttpCode.ServerError} ${error.message}\r\n\r\n`)
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}
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})
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// Intercept the response to rewrite absolute redirects against the base path.
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// Is disabled when the request has no base path which means /absproxy is in use.
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proxy.on("proxyRes", (res, req) => {
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if (res.headers.location && res.headers.location.startsWith("/") && (req as any).base) {
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res.headers.location = (req as any).base + res.headers.location
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}
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})
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