Fails to proxy from localhost to localhost

[vadi2]

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Checks

• [X] I understand project setup issues should be asked on StackOverflow or in GitHub Discussions.
• [X] I updated to latest http-proxy-middleware.

Describe the bug (be clear and concise)

Proxying from one localhost port to another localhost port doesn't seem to work.

Step-by-step reproduction instructions

app.use(
    "/api/organization/v1/organization",
    createProxyMiddleware({
      target: "http://localhost:8000",
      changeOrigin: true,
      pathRewrite: {
        "^/api/organization/v1/organization/": "/api/organization/v1/organization/",
      },
    })
  );

Results in:

[HPM] Error occurred while proxying request localhost:3000/api/organization/v1/organization/9db5e2af-81a1-476c-8ddb-45168e02fc6e to http://localhost:8000/ [ECONNREFUSED] (https://nodejs.org/api/errors.html#errors_common_system_errors)

### Expected behavior (be clear and concise)

The request is proxied.

### How is http-proxy-middleware used in your project?

```shell
% yarn why http-proxy-middleware
yarn why v1.22.19
[1/4] 🤔  Why do we have the module "http-proxy-middleware"...?
[2/4] 🚚  Initialising dependency graph...
[3/4] 🔍  Finding dependency...
[4/4] 🚡  Calculating file sizes...
=> Found "[email protected]"
info Has been hoisted to "http-proxy-middleware"
info Reasons this module exists
   - Specified in "dependencies"
   - Hoisted from "react-scripts#webpack-dev-server#http-proxy-middleware"
info Disk size without dependencies: "156KB"
info Disk size with unique dependencies: "744KB"
info Disk size with transitive dependencies: "8.67MB"
info Number of shared dependencies: 34
✨  Done in 0.39s.

What http-proxy-middleware configuration are you using?

app.use(
    "/api/organization/v1/organization",
    createProxyMiddleware({
      target: "https://fe59-2a02-a210-22c3-ab80-b4a6-fcf4-5617-2ff.ngrok.io",
      changeOrigin: true,
      pathRewrite: {
        "^/api/organization/v1/organization/": "/api/organization/v1/organization/",
      },
    })
  );

What OS/version and node/version are you seeing the problem?

MacOS 13.6

Additional context (optional)

No response

[leolcao]

We meet this issue also, try to set the target url with '0.0.0.0' or '127.0.0.1' instead of 'localhost'

[vadi2]

That was it - thank you.