manipulate request

[sdellava]

Hi, I need to proxy request coming from clients, bur in some cases I need to manage the response locally.

In case the request contains a specific word (in the example the word "moon", I need to response back and do noto proxy the request:

const proxy = createProxyMiddleware({
    target: 'https://my.target.node',
    changeOrigin: true,
    selfHandleResponse: true, 
    onProxyReq(proxyReq, req, res) {  

    console.log('req.url:', req.url);  
      if(req.url.includes("moon")) {  ............... do something and send the response without proxy the request ........ }
    },
    onProxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) => {
      const response = responseBuffer.toString('utf8'); 
      console.log('req:>> ', req.url);
      console.log('response :>> ', response);
      return response; 
    }),
  });

app.use('*', proxy);

How can I stop the proxy to process the request?

[chimurai]

Think custom filtering is what you're looking for:
https://github.com/chimurai/http-proxy-middleware/blob/master/recipes/context-matching.md#custom-filtering

You'll get something like:

createProxyMiddleware((path, req) => {
  return !req.url.includes("moon");  // requests with "moon" will be skipped
}, { target: 'https://my.target.node' });

[sdellava]

Just for reference, I've solved in a simpler way. Just filtered the request before activate the proxy:

...
app.use('/api/v1/sun', proxy);
app.use('/api/v1/earth', proxy);
app.use('/api/v1/moon', doSomethingDifferent);