feat: Implement server handler

[enisdenjo]

Complying with the GraphQL over HTTP Specification Working Draft (Jul 28, 2022).

Basic implementation with Node:

import http from 'http';
import { createHandler } from 'graphql-http';
import { schema } from './my-graphql';

const handler = createHandler({ schema });

const server = http.createServer(async (req, res) => {
  if (!req.url.startsWith('/graphql')) {
    return res.writeHead(404).end();
  }

  try {
    const [body, init] = await handler({
      url: req.url,
      method: req.method,
      headers: req.headers,
      body: await new Promise((resolve) => {
        let body = '';
        req.on('data', (chunk) => (body += chunk));
        req.on('end', () => resolve(body));
      }),
      raw: req,
    });
    res.writeHead(init.status, init.statusText, init.headers).end(body);
  } catch (err) {
    res.writeHead(500).end(err.message);
  }
});

server.listen(4000);
console.log('Listening to port 4000');

[enisdenjo]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀