Vite support for HTTP2 and proxy

pluginHttp2Proxy.ts

import proxy from 'http2-proxy';
import type { Plugin, ProxyOptions } from 'vite';

export const pluginHttp2Proxy = (): Plugin => {
  let routes: Record<string, string | ProxyOptions>;
  return {
    name: 'vite-plugin-http2-proxy',
    config: (config) => {
      const { server } = config;
      routes = server?.proxy ?? {};
      if (server) {
        server.proxy = undefined;
      }
      return config;
    },
    configureServer: ({ config: { logger }, middlewares }) => {
      Object.entries(routes).forEach(([route, target]) => {
        if (typeof target !== 'string') {
          throw new Error('ProxyOptions target are not supported yet, only string target are currently supported');
        }

        const { protocol, hostname, port } = new URL(target);
        const options = {
          protocol: protocol as 'http' | 'https',
          hostname,
          port: Number(port),
          proxyTimeout: 60000,
        };

        middlewares.use(route, (req, res) => {
          proxy.web(req, res, { ...options, path: req.originalUrl }, (err) => {
            if (err) {
              logger.error(`[http2-proxy] Error when proxying request on '${req.originalUrl}'`, { timestamp: true, error: err });
            }
          });
        });
      });
    },
  };
};

Here is my version with rewrite and configure support. Note that you should update your proxy config in configure() sections

proxy.on('proxyRes', (proxyRes) => {...} => proxy.onRes = async (req, res, proxyRes) => {...}

import type { Http2ServerRequest } from 'http2';
import type { Plugin, ProxyOptions } from 'vite';
import http2Proxy, { type http2WebOptions as Http2WebOptions } from 'http2-proxy';
....

This doesn't seem to work well with graphql subscriptions (stream types). Any insight as to why?

^ Are there any error messages or strange behaviours that you've noticed?

^ Are there any error messages or strange behaviours that you've noticed?

Hi Seb,

It says "proxy timeout". I tried to increase the timeout limit with no success. We are using server-side events, so its an http stream call that is open for a long time. It only does this on our http streams.

Appreciate the help!