Function writeHead

example/register-hooks/src/http.js:102–120

(statusCode, statusMessageOrHeaders, maybeHeaders)

            return resHeaders[name];
          },
          writeHead(statusCode, statusMessageOrHeaders, maybeHeaders) {
            if (headersSent) return;
            if (typeof statusMessageOrHeaders === "string") {
              this.statusCode = statusCode;
              this.statusMessage = statusMessageOrHeaders;
              Object.assign(resHeaders, maybeHeaders || {});
            } else {
              this.statusCode = statusCode;
              this.statusMessage = "OK";
              Object.assign(resHeaders, statusMessageOrHeaders || {});
            }
            const headerLines = Object.entries(resHeaders)
              .map(([k, v]) => `${k}: ${v}`)
              .join("\r\n");
            socket.write(
              `HTTP/1.1 ${this.statusCode} ${this.statusMessage}\r\n${headerLines}\r\n\r\n`
            );
            headersSent = true;
          },
          write(chunk) {
            if (!headersSent) {
              this.writeHead(this.statusCode);