Parsing the response from HTTP requests

[david1602]

I have noticed the HTTP module only returns a raw HTTP response string. I really wanted to use it for... reasons, so I have written a very rudimentary parser. Maybe this could be improved and/or (as an option) built into the HTTP module?

const isJSON = function (test) {
    try {
        JSON.parse(test);
        return true;
    } catch (e) {
        return false;
    }
};
function parseBody(body) {
    if ('string' !== typeof body) throw new Error('body to parse must be a string');

    if (!body.startsWith('HTTP/1.1')) throw new Error('Unexpected response: ' + body);

    // Here we can start parsing
    const obj = { headers: {}, body: '' };

    const splitter = body.indexOf('\r\n') !== -1 ? '\r\n' : '\n';

    const chunks = body.split(splitter);

    let IS_HEADER = true;

    for (let i = 0; i < chunks.length; i++) {
        const curr = chunks[i];
        if (i === 0) {
            const [, statusCode, status] = curr.match(/HTTP\/1\.1 (\d{3}) (.+)/);
            obj.status = {
                statusCode: statusCode,
                status: status
            };
        } else {
            if (IS_HEADER) {
                if ('' === curr) IS_HEADER = false;
                else {
                    const headerParts = curr.split(': ');
                    obj.headers[headerParts[0]] = headerParts[1];
                }
            } else {
                obj.body = obj.body + curr;
            }
        }
    }

    if (isJSON(obj.body)) obj.body = JSON.parse(obj.body);

    return obj;
}