Method contains

out/cli.cjs:58459–58462

(name)

          this[kHeadersSortedMap] = init[kHeadersSortedMap];
          this.cookies = init.cookies === null ? null : [...init.cookies];
        } else {
          this[kHeadersMap] = new Map(init);
          this[kHeadersSortedMap] = null;
        }
      }
      // https://fetch.spec.whatwg.org/#header-list-contains
      contains(name) {