Http error on server side (SSR)

[gvestit]

Hi,

We are having struggles with this error. When we refresh on page and renders it with SSR. graphql gives an error on Node.

The error is the next:

|main | ERROR ApolloError: undefined 8|main | at new ApolloError (/var/www/html/server/main.js:1:1260333) 8|main | at /var/www/html/server/main.js:18:2250540 8|main | at /var/www/html/server/main.js:47:1011502 8|main | at new ZoneAwarePromise (/var/www/html/server/main.js:18:2431986) 8|main | at Object.error (/var/www/html/server/main.js:47:1011456) 8|main | at notifySubscription (/var/www/html/server/main.js:47:870249) 8|main | at onNotify (/var/www/html/server/main.js:47:871052) 8|main | at SubscriptionObserver.error (/var/www/html/server/main.js:47:872109) 8|main | at /var/www/html/server/main.js:47:1008127 8|main | at Array.forEach (<anonymous>) { 8|main | graphQLErrors: [], 8|main | networkError: 'Unknown Error', 8|main | message: 'undefined', 8|main | extraInfo: undefined

Also we are debugged and can see this:
status: 0, 8|main | statusText: 'Unknown Error', 8|main | url: 'https://blog.XXX.com/graphql', 8|main | ok: false, 8|main | name: 'HttpErrorResponse', 8|main | message: 'Http failure response for https://blog.XXX.com/graphql: 0 Unknown Error', 8|main | error: ProgressEvent { 8|main | type: 'error', 8|main | target: XMLHttpRequest { 8|main | onloadstart: null, 8|main | onprogress: null, 8|main | onabort: null, 8|main | onerror: null, 8|main | onload: null, 8|main | ontimeout: null, 8|main | onloadend: null, 8|main | _listeners: [Object], 8|main | onreadystatechange: null, 8|main | _anonymous: undefined, 8|main | readyState: 4, 8|main | response: null, 8|main | responseText: '', 8|main | responseType: 'text', 8|main | responseURL: '', 8|main | status: 0, 8|main | statusText: '', 8|main | timeout: 0, 8|main | upload: [XMLHttpRequestUpload], 8|main | _method: 'POST',
My graphql.module.ts

import {NgModule} from '@angular/core';
import {APOLLO_OPTIONS} from 'apollo-angular';
import {ApolloClientOptions, InMemoryCache} from '@apollo/client/core';
import {HttpLink} from 'apollo-angular/http';
import {environment} from "../environments/environment";
import {HttpClientModule} from "@angular/common/http";
import {BrowserModule} from "@angular/platform-browser";

const uri = environment.BLOG_URL+'/graphql'; // <-- add the URL of the GraphQL server here
export function createApollo(httpLink: HttpLink): ApolloClientOptions {
return {
link: httpLink.create({uri}),
cache: new InMemoryCache(),
ssrMode: true,
ssrForceFetchDelay: 1000,
};
}

@NgModule({
imports: [
// ...
HttpClientModule,
],
providers: [
{
provide: APOLLO_OPTIONS,
useFactory: createApollo,
deps: [HttpLink],
},
],
})
export class GraphQLModule {}

Thank you

PD: Also when we execute the same build on local, it works.. It happens on PROD