I am trying to connect my reacetivesearch application to external elasticsearch provider( not AWS). They dont allow making changes to the elasticsearch cluster and also using nginx in front of the cluster .
As per the reacetivesearch documentation I have cloned the proxy code and only made changes to the target and the authentication setting(as per the code below ) .
https://github.com/appbaseio-apps/reactivesearch-proxy-server/blob/master/index.js
Proxy is successfully starting and able to connect the remote cluster . However when I connect reacetivesearch app through proxy I get the following error.
Access to XMLHttpRequest at 'http://localhost:7777/testing/_msearch?' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource
I repeated the same steps with my local elasticsearch cluster using the same proxy code and getting the same error .
Just was wondering do we need to make any extra changes to make sure the proxy sending the right request to the elasticsearch cluster ? I am using the below code for the proxy.
const express = require('express');
const proxy = require('http-proxy-middleware');
const btoa = require('btoa');
const app = express();
const bodyParser = require('body-parser')
/* This is where we specify options for the http-proxy-middleware
* We set the target to appbase.io backend here. You can also
* add your own backend url here */
const options = {
target: 'http://my_elasticsearch_cluster_adddress:9200/',
changeOrigin: true,
onProxyReq: (proxyReq, req) => {
proxyReq.setHeader(
'Authorization',
`Basic ${btoa('username:password')}`
);
/* transform the req body back from text */
const { body } = req;
if (body) {
if (typeof body === 'object') {
proxyReq.write(JSON.stringify(body));
} else {
proxyReq.write(body);
}
}
}
}
/* Parse the ndjson as text */
app.use(bodyParser.text({ type: 'application/x-ndjson' }));
/* This is how we can extend this logic to do extra stuff before
* sending requests to our backend for example doing verification
* of access tokens or performing some other task */
app.use((req, res, next) => {
const { body } = req;
console.log('Verifying requests ✔', body);
/* After this we call next to tell express to proceed
* to the next middleware function which happens to be our
* proxy middleware */
next();
})
/* Here we proxy all the requests from reactivesearch to our backend */
app.use('*', proxy(options));
app.listen(7777, () => console.log('Server running at http://localhost:7777 '));
Regards
