Method trackHeader

github-actions/browserstack/set-browserstack-env.js:6239–6244

(len)

            if (headerName === "keep-alive") {
              this.keepAlive += buf.toString();
            } else if (headerName === "connection") {
              this.connection += buf.toString();
            }
          } else if (key.length === 14 && util.bufferToLowerCasedHeaderName(key) === "content-length") {
            this.contentLength += buf.toString();
          }
          this.trackHeader(buf.length);
        }
        trackHeader(len) {