OAS3 seems not to support multiple cookies

[mikhuang]

Q&A (please complete the following information)

• OS: [e.g. macOS] macOS
• Environment: [e.g. Chrome 59, Node.js v10.0.0] Node v22.22.0
• Method of installation: [e.g. npm, unpkg] pnpm
• Swagger-Client version: [e.g. 3.8.0] 3.35.5
• Swagger/OpenAPI version: [e.g. Swagger 2.0, OpenAPI 3.0] OAS3

Content & configuration

Swagger/OpenAPI definition:

n/a

Swagger-Client usage:

import SwaggerClient from "swagger-client";

const operationId = "cookieTest";

const req = SwaggerClient.buildRequest({
  spec: {
    openapi: "3.1.0",
    paths: {
      "/": {
        get: {
          operationId,
          parameters: [
            {
              name: "c1",
              in: "cookie",
            },
            {
              name: "c2",
              in: "cookie",
            },
          ],
        },
      },
    },
  },
  operationId,
  parameters: {
    c1: "v1",
    c2: "v2",
  },
});

console.log(req.headers.Cookie);
if (req.headers.Cookie === "c2=v2") {
  console.log("Seems like should be both cookies");
}

Describe the bug you're encountering

To reproduce...

Steps to reproduce the behavior:

1. Set more than one cookie parameter
2. Observe that only last cookie is set

Expected behavior

Expect when there are multiple cookies set, they will all be set. However, only last is set.

Additional context or thoughts

In

swagger-js/src/execute/oas3/parameter-builders.js

Line 118 in 7baca90

req.headers.Cookie = serializeCookie({ [cookieName]: cookieValue });

Cookie is always overwritten in both cases. OAS2 was not examined

    req.headers.Cookie = serializeCookie({ [cookieName]: cookieValue });