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string | Record,\n headers?: Record,\n ): this {\n this.statusCode = statusCode;\n if (typeof statusMessage === \"string\") {\n this.statusMessage = statusMessage;\n if (headers) {\n this.headers = { ...this.headers, ...headers };\n }\n } else if (typeof statusMessage === \"object\") {\n this.headers = { ...this.headers, ...statusMessage };\n this.statusMessage = STATUS_CODES[statusCode] || \"Unknown\";\n } else {\n this.statusMessage = STATUS_CODES[statusCode] || \"Unknown\";\n }\n this._headersSent = true;\n return this;\n }\n\n setHeader(name: string, value: string | number | string[]): this {\n this.headers[name.toLowerCase()] = value; // Node.js headers are typically lowercase\n return this;\n }\n\n flushHeaders() {\n // This is wrong, but we must signal end here.\n // Otherwise, GET hangs.\n this.#writer.close();\n return this;\n }\n\n getHeader(name: string): string | number | string[] | undefined {\n return this.headers[name.toLowerCase()];\n }\n\n removeHeader(name: string): this {\n delete this.headers[name.toLowerCase()];\n return this;\n }\n\n hasHeader(name: string): boolean {\n return Object.prototype.hasOwnProperty.call(this.headers, name.toLowerCase());\n }\n\n getHeaders(): Record {\n return this.headers;\n }\n\n async write(chunk: any, encoding?: BufferEncoding, callback?: (error: Error | null | undefined) => void): boolean {\n let buffer: Uint8Array;\n if (typeof chunk === \"string\") {\n buffer = new TextEncoder().encode(chunk);\n } else if (chunk instanceof Buffer) { // Node.js Buffer\n buffer = new Uint8Array(chunk.buffer, chunk.byteOffset, chunk.byteLength);\n } else if (chunk instanceof Uint8Array) { // Web API Uint8Array\n buffer = chunk;\n } else {\n buffer = new TextEncoder().encode(String(chunk));\n }\n\n try {\n await this.#writer.write(buffer);\n if (callback) callback(null);\n return true;\n } catch (error: any) {\n if (callback) callback(error);\n return false;\n }\n }\n\n async end(chunk?: any, encoding?: BufferEncoding, callback?: 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