in lib/client.js [19:38]
function getCanonicalizedHeaders(headers) {
const keys = Object.keys(headers);
const prefixKeys = [];
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
if (key.startsWith('x-log-') || key.startsWith('x-acs-')) {
prefixKeys.push(key);
}
}
prefixKeys.sort();
var result = '';
for (let i = 0; i < prefixKeys.length; i++) {
const key = prefixKeys[i];
result += `${key}:${String(headers[key]).trim()}\n`;
}
return result;
}