class ContentMetaData { constructor(request, defaultCharset = "utf-8") { this.defaultCharset = defaultCharset; let {responseHeaders} = request; for (let h of responseHeaders) { if (/^\s*Content-(Type|Disposition)\s*$/i.test(h.name)) { this[h.name.split("-")[1].trim().toLowerCase()] = h.value; } } } get charset() { let charset = this.defaultCharset; if (this.type) { let m = this.type.match(/;\s*charset\s*=\s*(\S+)/); if (m) { charset = m[1]; } } Object.defineProperty(this, "charset", { value: charset, writable: false, configurable: true }) } createDecoder() { try { return new TextDecoder(charset); } catch (e) { return new TextDecoder(this.defaultCharset); } } };