73 lines
2.3 KiB
JavaScript
73 lines
2.3 KiB
JavaScript
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import { json } from './json.js';
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import { createETag, setCharset } from './utils.js';
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/**
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* Sends the HTTP response.
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*
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* The body parameter can be a Buffer object, a string, an object, or an array.
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*
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* This method performs many useful tasks for simple non-streaming responses.
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* For example, it automatically assigns the Content-Length HTTP response header field (unless previously defined) and provides automatic HEAD and HTTP cache freshness support.
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*
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* @param req Request
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* @param res Response
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*/
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export const send = (req, res) => (body) => {
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let bodyToSend = body;
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if (Buffer.isBuffer(body)) {
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bodyToSend = body;
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}
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else if (typeof body === 'object' && body !== null) {
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// in case of object - turn it to json
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bodyToSend = JSON.stringify(body, null, 2);
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}
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else if (typeof body === 'string') {
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// reflect this in content-type
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const type = res.getHeader('Content-Type');
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if (type && typeof type === 'string') {
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res.setHeader('Content-Type', setCharset(type, 'utf-8'));
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}
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else
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res.setHeader('Content-Type', setCharset('text/html', 'utf-8'));
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}
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// Set encoding
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const encoding = 'utf8';
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// populate ETag
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let etag;
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if (body && !res.getHeader('etag') && (etag = createETag(bodyToSend, encoding))) {
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res.setHeader('etag', etag);
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}
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// freshness
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if (req.fresh)
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res.statusCode = 304;
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// strip irrelevant headers
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if (res.statusCode === 204 || res.statusCode === 304) {
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res.removeHeader('Content-Type');
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res.removeHeader('Content-Length');
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res.removeHeader('Transfer-Encoding');
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bodyToSend = '';
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}
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if (req.method === 'HEAD') {
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res.end('');
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return res;
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}
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if (typeof body === 'object') {
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if (body == null) {
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res.end('');
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return res;
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}
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if (Buffer.isBuffer(body)) {
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if (!res.getHeader('Content-Type'))
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res.setHeader('content-type', 'application/octet-stream');
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res.end(bodyToSend);
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}
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else
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json(res)(bodyToSend, encoding);
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}
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else {
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if (typeof bodyToSend !== 'string')
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bodyToSend = bodyToSend.toString();
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res.end(bodyToSend, encoding);
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}
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return res;
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};
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//# sourceMappingURL=send.js.map
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