Resource with the 304 status code and the 'content-length: x' header does not load

[LavrovArtem]

Server for reproducing:

const net = require('net');

net.createServer(socket => {
    socket.on('data', data => {
        const stringData = data.toString();
        const url = stringData.match(/GET ([\s\S]+) HTTP/)[1];

        if (url === '/') {
            if (!/If\-None\-Match/ig.test(stringData)) {
                socket.write([
                    'HTTP/1.1 200 OK',
                    'ETag: "eyJ2ZXJzaW9uIjowLCJ1cmkiOiJwYWdlcy9ob21lIiwiaGFzaCI6InpuRDdTQT09In0="',
                    'Content-Length: 5',
                    '',
                    'Hello'
                ].join('\r\n'));
            } else {
                socket.write([
                    'HTTP/1.1 304 Not Modified',
                    'Content-Length: 5',
                    '',
                    ''
                ].join('\r\n'));
            }
        } else {
            socket.write('HTTP/1.1 404 Not Found');
            socket.end();
        }
    });
}).listen(8124, () => console.log('server bound'));

Proxy works fine if we remove the Content-Length header from server above from cached response or if we add body to this response.

Workaround is disable cache in browser.

[LavrovArtem]

https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5

The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields.

[lock]

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