Upgrading from react-script 3.3.1 to react-scripts 3.4.0 required changing setupProxy

[breathe]

Not 100% sure why -- but after upgrading to react-scripts 3.4.0 it became necessary for me to change the way that I'm requiring the http proxy ...

The instructions from here -- https://create-react-app.dev/docs/proxying-api-requests-in-development/ -- fail with 'proxy is not a function'

I had to change this code (which was working before ...):

const proxy = require("http-proxy-middleware");

const setupBackend = require("./setupBackend");
const target = setupBackend();

module.exports = function(app) {
 console.log("Setting up proxy url's on development server");

 app.use(
 ["/token_api", "/__meta_request"],
 proxy({
 target,
 changeOrigin: true,
 preserveHeaderKeyCase: false
 })
 );
};

To this:

const proxy = require("http-proxy-middleware").createProxyMiddleware;

const setupBackend = require("./setupBackend");
const target = setupBackend();

module.exports = function(app) {
 console.log("Setting up proxy url's on development server");

 app.use(
 ["/token_api", "/__meta_request"],
 proxy({
 target,
 changeOrigin: true,
 preserveHeaderKeyCase: false
 })
 );
};

[partynikko]

Your two examples are identical. Did you accidentally paste the same code twice?

[breathe]

@partynikko oops I did ... edited.

The original code I had to change used the default export off of the http-proxy-middleware ...

const proxy = require("http-proxy-middleware");

const setupBackend = require("./setupBackend");
const target = setupBackend();

module.exports = function(app) {
 console.log("Setting up proxy url's on development server");

 app.use(
 ["/token_api", "/__meta_request"],
 proxy({
 target,
 changeOrigin: true,
 preserveHeaderKeyCase: false
 })
 );
};

[partynikko]

This has nothing to do with CRA but with http-proxy-middleware package. They just released a new major version introducing breaking changes like the one you are referring to.

Could it be that you probably upgraded that package and confused it with the update of react-scripts?

[hjr3]

https://create-react-app.dev/docs/proxying-api-requests-in-development/#configuring-the-proxy-manually is now wrong due to the breaking changes in http-proxy-middleware.

I opened #8515 to fix.