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@Tyler Liu,
Thanks for the answer. The code posted above has solved the proxy issue.

Sample code (un-tested):

const platform = rcsdk.platform;
const send = platform.send.bind(platform);
platform.send = (options) => {
    return send({...options, agent: new HttpsProxyAgent('YOUR PROXY SERVER')});
};
platform.login(...);

According to https://github.com/node-fetch/node-fetch/issues/79

Solution is

fetch('https://www.google.com',{ agent:new HttpsProxyAgent('http://127.0.0.1:8580')}).then(function(res){
    ...
})

JS SDK supports options: https://github.com/ringcentral/ringcentral-js/blob/986b1ade72b502976a2f892a5ff2bb40a96bc464/sdk/src/platform/Platform.ts#L553-L578

Please have a try and update me. I don't have an env to verify. But I reviewed the relevant code, it should work.

@Tyler Liu,
Yes, RingCentral server can be reach from the command line via curl.

root@umt-virtual-machine:/opt# curl -v --insecure https://platform.devtest.ringcentral.com/restapi/v1.0
* Trying 172.28.12.5...
* TCP_NODELAY set
* Connected to (nil) (172.28.12.5) port 80 (#0)
* Establish HTTP proxy tunnel to platform.devtest.ringcentral.com:443
> CONNECT platform.devtest.ringcentral.com:443 HTTP/1.1
> Host: platform.devtest.ringcentral.com:443
> User-Agent: curl/7.52.1
> Proxy-Connection: Keep-Alive
>
< HTTP/1.1 200 Connection established
<
* Proxy replied OK to CONNECT request
* ALPN, offering h2
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* NPN, negotiated HTTP1.1
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
* TLSv1.2 (OUT), TLS handshake, Unknown (67):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / AES256-GCM-SHA384
* ALPN, server did not agree to a protocol
* Server certificate:
* subject: OU=Domain Control Validated; CN=*.devtest.ringcentral.com
* start date: Jul 3 12:19:12 2020 GMT
* expire date: Jul 3 11:31:30 2022 GMT
* issuer: C=US; ST=Arizona; L=Scottsdale; O=GoDaddy.com, Inc.; OU=http://certs.godaddy.com/repository/; CN=Go Daddy Secure Certificate Authority - G2
* SSL certificate verify ok.
> GET /restapi/v1.0 HTTP/1.1
> Host: platform.devtest.ringcentral.com
> User-Agent: curl/7.52.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx
< Date: Tue, 17 Nov 2020 17:56:40 GMT
< Content-Type: application/json;charset=utf-8
< Content-Length: 169
< Connection: keep-alive
< RCRequestId: 3eef543c-28fe-11eb-84ba-005056bb86e2
< RoutingKey: SJC11P01PAS02
< Content-Language: en
< Vary: Accept-Encoding, User-Agent
<
{
"uri" : "https://platform.devtest.ringcentral.com/restapi/v1.0",
"versionString" : "1.0.44",
"releaseDate" : "2020-11-06T00:00:00.000Z",
"uriString" : "v1.0"
* Curl_http_done: called premature == 0
* Connection #0 to host (nil) left intact

But, callling sdk.platform.login() fails to reach the server when running on a nodejs app

FetchError: request to https://platform.devtest.ringcentral.com/restapi/oauth/token failed, reason: connect ETIMEDOUT 192.209.29.78:443

We've set in the server https_proxy and http_proxy environment variable as well we set npm configuration for proxy and https-proxy

It seems to me that the RC sdk doesn't take care of proxy configuration when calling the fetch request.

I don't think there are any proxy configurations in JS SDK.

Could you please try

curl https://platform.devtest.ringcentral.com/restapi/v1.0

in your environment?

Can curl reach RingCentral server? If not, could you please configure your proxy to transparently forward HTTP traffic to https://platform.devtest.ringcentral.com ?