Class CustomFormData

tests/unit/adapters/http.test.js:4444–4461

      }

      class CustomFormData extends stream.Readable {
        _read() {
          this.push(null);
        }
        append() {}
        getHeaders() {
          return {
            'content-type': 'multipart/form-data; boundary=----fake',
            'x-injected': 'custom',
            'x-forwarded-for': '10.0.0.1',
            authorization: 'Bearer CUSTOM_TOKEN',
            host: 'custom.example.com',
          };
        }
        get [Symbol.toStringTag]() {
          return 'FormData';
        }
      }

      it('preserves legacy getHeaders() propagation by default', async () => {
        let capturedHeaders;