YMFE/yapi · error

context.hostname 不能被赋值

Error message

context.hostname 不能被赋值

What it means

context.hostname in the test-script sandbox is a read-only getter derived from the request URL. The setter exists solely to throw, preventing scripts from mutating the resolved host.

Source

Thrown at common/postmanLib.js:266

async function crossRequest(defaultOptions, preScript, afterScript, commonContext = {}) {
  let options = Object.assign({}, defaultOptions);
  const taskId = options.taskId || Math.random() + '';
  let urlObj = URL.parse(options.url, true),
    query = {};
  query = Object.assign(query, urlObj.query);
  let context = {
    isNode,
    get href() {
      return urlObj.href;
    },
    set href(val) {
      throw new Error('context.href 不能被赋值');
    },
    get hostname() {
      return urlObj.hostname;
    },
    set hostname(val) {
      throw new Error('context.hostname 不能被赋值');
    },

    get caseId() {
      return options.caseId;
    },

    set caseId(val) {
      throw new Error('context.caseId 不能被赋值');
    },

    method: options.method,
    pathname: urlObj.pathname,
    query: query,
    requestHeader: options.headers || {},
    requestBody: options.data,
    promise: false,
    storage: await getStorage(taskId)
  };

View on GitHub (pinned to 59bade3a8a)

Solutions

1. Delete the hostname assignment from the script
2. Change the request URL/environment at the case level instead of in the script
3. Only read context.hostname in scripts

Example fix

// before
context.hostname = 'staging.api.com';
// after
// configure environment host in the case, then read it
const host = context.hostname;

if (context.hostname !== expectedHost) console.warn('unexpected host; reconfigure environment instead of assigning');

function isReadOnlyCtxProp(obj, key){ const d = Object.getOwnPropertyDescriptor(obj, key); return !!d && d.get && d.set && d.set.toString().includes('throw'); }

try {
  context.hostname = host;
} catch (e) {
  console.warn('hostname is derived from request URL and cannot be set');
}

When it happens

Trigger: A case script executes context.hostname = 'api.example.com' during test/assert execution.

Common situations: Attempting to switch environments from inside a script; copying Postman snippets that mutate context; misunderstand that sandbox context is read-only.

Related errors

• context.href 不能被赋值
• context.caseId 不能被赋值

AI-assisted analysis of YMFE/yapi@59bade3a8a (2026-08-29). Data as JSON: /api/errors/b30ae4f4dc5bdc7c. Report an issue: GitHub.