better-fetch

server.ts

import { honoRouter } from '@api-node/lib/hono';
import { zValidator } from '@hono/zod-validator';
import { Dispatcher, ProxyAgent } from 'undici';
import { z } from 'zod';

export const betterFetchRouter = honoRouter.all(
    '/',
    zValidator(
        'header',
        z.object({
            'x-fastfn-better-fetch-url': z.string().url(),
            'x-fastfn-better-fetch-proxy': z.string().url().optional(),
        })
    ),
    async (c) => {
        const headerData = c.req.valid('header');

        const dispatcher = headerData['x-fastfn-better-fetch-proxy']
            ? (new ProxyAgent({
                  uri: headerData['x-fastfn-better-fetch-proxy'],
                  requestTls: { rejectUnauthorized: false },
              }) as Dispatcher)
            : undefined;

        const res = await fetch(headerData['x-fastfn-better-fetch-url'], {
            dispatcher,

            method: c.req.raw.method,
            headers: cloneAndCleanHeaders(c.req.raw.headers),
            body: c.req.raw.body,
            signal: c.req.raw.signal,
            redirect: c.req.raw.redirect,
        });

        const newHeaders = new Headers(res.headers);
        newHeaders.delete('content-encoding');

        return new Response(res.body, {
            status: res.status,
            headers: newHeaders,
            statusText: res.statusText,
        });
    }
);

function cloneAndCleanHeaders(headers: Headers) {
    const newHeaders = new Headers(headers);
    for (const key of headers.keys()) {
        if (!key.startsWith('x-fastfn')) {
            newHeaders.delete(key);
        }
    }

    return newHeaders;
}