// Apply logger on the provided connection
static applyLogger(connection, logger) {
// Check for enabled logger to log the connection
if (Config.isEnabled(logger.enabled, connection)) {
connection.log(logger.format, logger.tokens, logger.log);
}
}
// Prepare connection for writing process
static start(connection) {
const { compression, cors, timeout } = connection._router._options;
// Set the default content type if it is not defined
if (!connection.type()) {
connection.type('html');
}
// Check for CORS requests
if (connection.headers.origin) {
HTTPConnection.applyCORS(connection, cors);
}
// Check for requests accepting compressed response
if (connection.headers['accept-encoding']) {
HTTPConnection.applyCompression(connection, compression);
} else {
// In Node 10+ use stream.pipeline()
connection.pipe(connection.response);
}
// Set the connection keep alive timeout from router options
if (Config.isEnabled(timeout.enabled, connection)) {
connection.keep(timeout.value);
}
// Set the started flag
connection._started = true;
}
// Apply compression on the provided connection
static applyCompression(connection, compression) {
let responseStream = connection.response;
// Check for enabled compression and filter connection
if (Config.isEnabled(compression.enabled, connection)) {
const header = connection.headers['accept-encoding'];
const encodings = QValueParser.parse(header, true);
let encoding = null;
// Check for accepted encoding
if (encodings.includes(compression.preferred)) {
if (compression.preferred === 'deflate') {
encoding = 'Deflate';
} else {
encoding = 'Gzip';
}
} else if (encodings.includes('deflate')) {
encoding = 'Deflate';
} else if (encodings.includes('gzip')) {
encoding = 'Gzip';
}
// Check for encoding to set the header and prepare the response
if (encoding) {
connection.header('Content-Encoding', encoding);
responseStream = zlib[encoding](compression.options);
// In Node 10+ use stream.pipeline()
responseStream.pipe(connection.response);
}
}
// Pipe the connection to the response stream
// In Node 10+ use stream.pipeline()
connection.pipe(responseStream);
}